CN104451314A - High-strength heat-resistant cast magnesium alloy and preparation method thereof - Google Patents
High-strength heat-resistant cast magnesium alloy and preparation method thereof Download PDFInfo
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- CN104451314A CN104451314A CN201410787879.9A CN201410787879A CN104451314A CN 104451314 A CN104451314 A CN 104451314A CN 201410787879 A CN201410787879 A CN 201410787879A CN 104451314 A CN104451314 A CN 104451314A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Abstract
The invention discloses a high-strength heat-resistant cast magnesium (Mg) alloy. The high-strength heat-resistant cast Mg alloy is prepared from the following components in percentage by mass: 6-12% of Gd, 0.5-2.5% of Zn, 0.5-2.5% of Si, 0.2-0.6% of Zr, 0.1-0.3% of B, less than 0.02% of impurity elements (Fe, Cu and Ni) and the balance of Mg. In the invention, Si is added into an Mg-Y-Zn alloy in a high-strength LPSO (long-period stacking order) structure to generate an Mg2Si strengthening phase with high modulus of elasticity so that the modulus of elasticity of the high-strength heat-resistant cast Mg alloy is increased, meanwhile, a K2ZrCl6-LiCl-CaF2 mixed salt is added to refine an alpha-Mg matrix, an Mg-B2O3 modificator is added to modify the coarse dendritic primary Mg2Si and refine the alpha-Mg matrix and the Mg2Si crystals, and the tertiary solution treatment and the aging treatment are carried out, therefore the high-strength heat-resistant cast Mg alloy is prepared.
Description
Technical field
The present invention relates to nonferrous materials and manufacture field thereof, specifically, that relate to is a kind of high-strength temperature-resistant cast magnesium alloys and preparation method.
Background technology
Magnesium alloy is structural metallic materials the lightest in current practical application, has that density is little, specific tenacity and a specific rigidity advantages of higher, has application prospect very widely in the field such as automobile, aerospace.In recent years, the speed goes of aerospace and transport facility is high, required aerodynamic power is increasing, the stability requirement of component is highly reliable, the high-temperature capability of magnesium alloy and elastoresistance deformability are had higher requirement, and the Young's modulus of ordinary magnesium alloy is about 60% of aluminium alloy, general between 40 ~ 45GPa, even if the high-strength heat-resistant rare earth magnesium alloy Mg – Gd – Y – Zr of recent development, Chen Changjiang is in Master's thesis " development research of engine piston heat resisting magnesium-rare earth alloy " (Shanghai, Shanghai Communications University, 2010) in, research shows, its room temperture elastic modulus is also only about 45GPa, its elastoresistance deformability is poor, room temperature and 300 DEG C time tensile strength be respectively 320MPa and 250MPa, the demand of engineering field to light-high-strength high elastic coefficient magnesium alloy materials can not be met.Therefore, the demand researching and developing high-strength temperature-resistant casting magnesium alloy material has become very urgent.
From mixing rule, the intensity of polyphase alloy and Young's modulus determine consisting of the intensity of phase and Young's modulus and volume fraction thereof, introduces other compositions to form intensity and the Young's modulus that alloying element or compound second-phase can affect matrix metal.Research in recent years finds to generate long-periodic structure phase (LPSO structure) in some Mg-RE-Zn alloy, LPSO structure has the series of characteristics such as high rigidity, high-plasticity, high elastic coefficient and the interface cohesion good with magnesium matrix, and this structure can significantly improve Alloy At Room Temperature and hot strength while not endangering alloy plasticity.The Rapidly Solidified Powder Metallurgy Mg that Kawamura etc. deliver on " Materials Transactions " (material proceedings) calendar year 2001 the 42nd phase 1172-1176 page
97zn
1y
2the preparation of Alloys with Excellent Tensile Yield Strength above 600MPa(Rapid Solidification Powder metallurgical technology has 600MPa with the Mg of upper yield strength
97y
2zn
1alloy) research shows, LPSO structure significantly can improve the mechanical property of alloy, and this alloy at room temperature yield strength reaches 5% up to 610MPa, unit elongation, is keeping the superstrength achieving magnesium alloy while good plasticity.Leng etc. have microtexture and the strong mechanical performance of the Mg – 9RY – 4Zn of LPSO structure at Microstructure and high mechanical properties of Mg – 9RY – 4Zn (RY:Y-rich misch metal) the alloy with long period stacking ordered phase(that " Materials Science and Engineering A " (Materials Science and Engineering) the 40th phase 38-45 page was delivered in 2012) report a kind of tough hot extrusion Mg-RY-Zn(RY of high strength at high temperature containing LPSO phase: yttrium-rich RE) alloy, when 300 DEG C, tensile strength still can remain on about 300MPa.
Simultaneously, the microtexture of Microstructures and mechanical properties of the Mg – 8Gd – 4Y – Nd – Zn – 3Si (wt%) the alloy(Mg – 8Gd – 4Y – Nd – Zn – 3Si alloy that Hu etc. deliver on " Materials Science and Engineering A " (Materials Science and Engineering) the 571st phase 19 – in 2013 24 pages and mechanical property) research shows, add silicon (Si) in the magnesium alloy, the Mg with high elastic coefficient (120GPa) and resistance toheat can be generated
2si, improves the Young's modulus of alloy.But, the interpolation of Si element also significantly reduces the mobility of alloy melt, worsens the castability of alloy, the Mg and thick dendroid is come into being
2si is the grievous injury mechanical property of alloy also.In order to improve the performance containing Si-Mg alloy, grain refining and Metamorphism treatment are one of important approach.Zirconium (Zr) fining agent that current magnesium-rare earth is conventional mainly adds with the form of binary Mg-Zr master alloy.Through finding the literature search of prior art, Chinese invention patent number is the production method that patent discloses a kind of Mg-Zr intermediate alloy of ZL200410020594.9, and production technique is simple, processing ease.But, the problem such as the method adding Zr with Mg-Zr master alloy form still exists that alloy impurity is higher, uneven components, gravity segregation, Zr loss are serious.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, provides a kind of high-strength temperature-resistant cast magnesium alloys and preparation method.It generates the Mg of high elastic coefficient by adding Si in the Mg-Y-Zn alloy with high strength LPSO structure
2si strengthening phase, carries heavy alloyed Young's modulus, meanwhile, adds K
2zrCl
6-LiCl-CaF
2mixing salt refinement
α-Mg matrix, adds Mg-B
2o
3alterant to be come into being Mg to thick dendroid
2si carries out Metamorphism treatment, realizes
α-Mg and Mg
2the grain refining of Si, and then carry out three-stage solution process and ageing treatment, and then prepare high-strength temperature-resistant cast magnesium alloys.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of high-strength temperature-resistant cast magnesium alloys, its each component and mass percent thereof are: 2 ~ 8%Y, 1 ~ 4%Zn, 1 ~ 3%Si, 0.3 ~ 0.7%Zr, 0.1 ~ 0.3%B, and the total amount of Impurity Fe, Cu and Ni is less than 0.03%, and surplus is Mg.
A preparation method for high-strength temperature-resistant cast magnesium alloys, comprises melting technology and thermal treatment process, and when wherein carrying out melting technology, Y adds with the form of Mg-25wt %Y master alloy, and Zr is with K
2zrCl
6-LiCl-CaF
2mixing salt form add, B is with Mg-B
2o
3form add, Mg, Zn and Si add with the form of pure Mg, pure Zn and pure Si respectively.
Described melting technology is at SF
6and CO
2carry out under mixed gas protected condition, step is as follows:
(1) prepare burden: raw material adopts pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, K
2zrCl
6-LiCl-CaF
2mixing salt, Mg-B
2o
3, prepare burden according to described mass percent;
(2) material is dried: by pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, K
2zrCl
6-LiCl-CaF
2mixing salt and Mg-B
2o
3200 ~ 220 DEG C of preheatings 2 ~ 4 hours;
(3) molten Mg and Si: adopt crucible electrical resistance furnace by the pure magnesium fusing after drying, after pure magnesium fusing, add pure silicon at 740 ~ 760 DEG C, and every 5 minutes to Melt Stirring once;
(4) add Zn and Y: in the magnesium liquid of 670 ~ 690 DEG C, add pure Zn, after magnesium liquid temp reaches 720 ~ 740 DEG C, add Mg-25wt%Y master alloy;
(5) Zr and B is added: until pure Mg, pure Si, pure Zn and Mg-25wt%Y are warming up to 760 ~ 780 DEG C after melting completely time, add K
2zrCl
6-LiCl-CaF
2mixing salt and Mg-B
2o
3;
(6) pour into a mould: treat K
2zrCl
6-LiCl-CaF
2mixing salt and Mg-B
2o
3melt completely, after stirring, magnesium liquid temp is risen to 750 ~ 770 DEG C of insulations 25 minutes, then 740 ~ 760 DEG C are cooled to, continuous electrorefining 15 minutes, be warming up to 770 DEG C after refining and leave standstill 25 minutes, after 720 ~ 740 DEG C, skim surface scum after leaving standstill and cast, casting mould is heated to 220 ~ 250 DEG C in advance.
The step of described thermal treatment process is as follows: (1) three-stage solution process: be first incubated 1 hour to magnesium alloy middle temperature 300 ~ 350 DEG C, be placed in rapidly 80 DEG C of hot water and quench after taking-up; Then secondary high temperature 400 ~ 460 DEG C insulation 4 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench; Finally high temperature 480 ~ 520 DEG C insulation 4 ~ 20 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench;
(2) ageing treatment: to the alloy after solution treatment 200 ~ 240 DEG C of insulations 8 ~ 24 hours, after taking out, air cooling is to room temperature.
Described K
2zrCl
6-LiCl-CaF
2mixing salt concrete composition be 60wt%K
2zrCl
6-20wt %LiCl-20wt%CaF
2.
Described Mg-B
2o
3alterant, its concrete composition is 60wt%Mg-40wt%B
2o
3.
The present invention adopts Y(yttrium) be the first constituent element, Y can make the solid solubility of Zn in Mg slightly reduce, and forms LPSO structure with Zn, but add the appearance that too much Y can postpone age hardening peak, and then low-alloyed intensity is fallen, raise the cost, therefore the content of Y is selected to control at 2 ~ 8wt%; The present invention adopts Zn(zinc) be the second constituent element, adding of Zn can become stable strengthening phase with Mg with Y shape, and adjusts castability; The present invention adopts Si(silicon) be third element, Si adds the Mg that can generate and have high elastic coefficient
2si, improves the Young's modulus of alloy; The present invention adopts K
2zrCl
6-LiCl-CaF
2mixing salt, as fining agent, not only can reach the thinning effect adopting Mg-Zr master alloy to reach as fining agent, and simpler than the process for refining of Mg-Zr master alloy, Zr element segregation is less, and recovery rate is high, fade resistance is stronger, further increases the intensity of alloy; The present invention adopts Mg-B
2o
3as alterant, can remarkable refinement Mg
2si particle, and modification effect is stablized, and has long-lasting, further increases the Young's modulus of alloy.
Beneficial effect of the present invention: (1) generates the Mg of high elastic coefficient by adding Si in the Mg-Y-Zn alloy with high strength LPSO structure
2si strengthening phase, carries heavy alloyed Young's modulus, meanwhile, adds K
2zrCl
6-LiCl-CaF
2mixing salt refinement
α-Mg matrix, adds Mg-B
2o
3alterant to be come into being Mg to thick dendroid
2si carries out Metamorphism treatment, realizes
α-Mg and Mg
2the grain refining of Si.(2) the present invention adopts K
2zrCl
6-LiCl-CaF
2mixing salt, as fining agent, not only can reach the thinning effect adopting Mg-Zr master alloy to reach as fining agent, and simpler than the process for refining of Mg-Zr master alloy, and Zr element segregation is less, and recovery rate is high, and fade resistance is stronger; (3) the present invention adopts Mg-B
2o
3as alterant, can remarkable refinement Mg
2si particle, and modification effect is stablized, and has long-lasting; (4) three-stage solution process of the present invention and ageing treatment can make LPSO structure more uniform precipitation and growth in alloy substrate, realize the regulation and control to LPSO scantlings of the structure, are conducive to the strengthening of alloy matrix; (5) K is adopted
2zrCl
6-LiCl-CaF
2mixing salt (refinement
α-Mg matrix) and Mg-B
2o
3alterant (rotten Mg
2si particle) as composite refining agent, the thinning effect adopting Mg-Zr master alloy to reach as fining agent not only can be reached, and simpler than the process for refining of Mg-Zr master alloy, Zr and B element segregation less, recovery rate is high, and fade resistance is stronger, reduces magnesium alloy production cost.Therefore, the Mg of high elastic coefficient is generated by adding Si in the Mg-Y-Zn alloy with high strength LPSO structure
2si strengthening phase, carries heavy alloyed Young's modulus, adds K simultaneously
2zrCl
6-LiCl-CaF
2mixing salt and Mg-B
2o
3as composite crystal grain fining agent, remarkable refining alloy crystal grain, and then prepare high-strength temperature-resistant cast magnesium alloys.
Embodiment
The present invention generates the Mg of high elastic coefficient by adding Si in the Mg-Y-Zn alloy with high strength LPSO structure
2si strengthening phase, carries heavy alloyed Young's modulus, meanwhile, adds K
2zrCl
6-LiCl-CaF
2mixing salt refinement
α-Mg matrix, adds Mg-B
2o
3alterant to be come into being Mg to thick dendroid
2si carries out Metamorphism treatment, realizes
α-Mg and Mg
2the grain refining of Si, and then carry out three-stage solution process and ageing treatment, and then prepare high-strength temperature-resistant cast magnesium alloys.
The preparation method of a kind of high-strength temperature-resistant cast magnesium alloys involved in the present invention, it comprises melting technology and thermal treatment process two parts:
Described melting technology is at SF
6and CO
2carry out under mixed gas protected condition, step is as follows: (1) prepares burden: raw material adopts pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, K
2zrCl
6-LiCl-CaF
2mixing salt, Mg-B
2o
3, prepare burden according to described mass percent; (2) material is dried: by pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, K
2zrCl
6-LiCl-CaF
2mixing salt and Mg-B
2o
3200 ~ 220 DEG C of preheatings more than 2 hours; (3) molten Mg and Si: adopt crucible electrical resistance furnace by the pure magnesium fusing after drying, after pure magnesium fusing, add pure silicon at 740 ~ 760 DEG C, and every 5 minutes to Melt Stirring once; (4) add Zn and Y: in the magnesium liquid of 670 ~ 690 DEG C, add pure Zn, after magnesium liquid temp reaches 720 ~ 740 DEG C, add Mg-25wt%Y master alloy; (5) Zr and B is added: until pure Mg, pure Si, pure Zn and Mg-25wt%Y are warming up to 760 ~ 780 DEG C after melting completely time, add K
2zrCl
6-LiCl-CaF
2mixing salt and Mg-B
2o
3; (6) pour into a mould: treat K
2zrCl
6-LiCl-CaF
2mixing salt and Mg-B
2o
3melt completely, after stirring, magnesium liquid temp is risen to 750 ~ 770 DEG C of insulations 25 minutes, then 740 ~ 760 DEG C are cooled to, continuous electrorefining 15 minutes, be warming up to 770 DEG C after refining and leave standstill 25 minutes, after 720 ~ 740 DEG C, skim surface scum after leaving standstill and cast, casting mould is heated to 220 ~ 250 DEG C in advance.
Described thermal treatment process comprises three-stage solution process and ageing treatment, and wherein, three-stage solution is treated to: be first incubated 1 hour to magnesium alloy middle temperature 300 ~ 350 DEG C, be placed in rapidly 80 DEG C of hot water and quench after taking-up; Then secondary high temperature 400 ~ 460 DEG C insulation 4 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench; Finally high temperature 480 ~ 520 DEG C insulation 4 ~ 20 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench; Ageing treatment is: to the alloy after solution treatment 200 ~ 240 DEG C of insulations 8 ~ 24 hours, after taking out, air cooling is to room temperature.
In preparation method of the present invention, described K
2zrCl
6-LiCl-CaF
2mixing salt, its concrete composition is 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2; Described Mg-B
2o
3alterant, its concrete composition is 60wt%Mg-40wt%B
2o
3.
Below in conjunction with specific embodiment, the present invention is elaborated, described embodiment premised on technical solution of the present invention under give detailed enforcement mode and concrete operating process, but protection scope of the present invention is not limited only to following embodiment.
Embodiment 1
Component and the mass percent thereof of the high-strength temperature-resistant cast magnesium alloys of the present embodiment are: 2wt%Y, 1wt%Zn, 3wt%Si, 0.3wt%Zr, 0.3wt%B, and the total amount of Impurity Fe, Cu and Ni is less than 0.03wt%, and surplus is Mg.
The preparation method of the magnesium alloy of the present embodiment comprises melting technology and thermal treatment process two parts.
Described melting technology is at SF
6and CO
2carry out under mixed gas protected condition, step is as follows: (1) prepares burden: raw material adopts pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt, 60wt%Mg-40wt%B
2o
3, prepare burden according to described mass percent; (2) material is dried: by pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt and 60wt%Mg-40wt%B
2o
3200 DEG C of preheatings 2 hours; (3) molten Mg and Si: adopt crucible electrical resistance furnace by the pure magnesium fusing after drying, after pure magnesium ingot fusing, add pure silicon at 740 DEG C, and every 5 minutes to Melt Stirring once; (4) add Zn and Y: in the magnesium liquid of 670 DEG C, add pure Zn, after magnesium liquid temp reaches 720 DEG C, add Mg-25wt%Y master alloy; (5) Zr and B is added: until pure Mg, pure Si, pure Zn and Mg-25wt%Y are warming up to 760 DEG C after melting completely time, add 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt and 60wt%Mg-40wt%B
2o
3; (6) pour into a mould: treat 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt and 60wt%Mg-40wt%B
2o
3melt completely, after stirring, magnesium liquid temp is risen to 750 DEG C of insulations 25 minutes, be then cooled to 740 DEG C, continuous electrorefining 15 minutes, be warming up to 770 DEG C after refining and leave standstill 25 minutes, after 720 DEG C, skim surface scum after leaving standstill and cast, casting mould is heated to 220 DEG C in advance;
Described thermal treatment process comprises three-stage solution process and ageing treatment, and wherein, three-stage solution is treated to: be first incubated 1 hour to magnesium alloy middle temperature 300 DEG C, be placed in rapidly 80 DEG C of hot water and quench after taking-up; Then secondary high temperature 400 DEG C insulation 4 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench; Finally high temperature 480 DEG C insulation 20 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench; Ageing treatment is: to the alloy after solution treatment 240 DEG C of insulations 8 hours, after taking out, air cooling is to room temperature.
The room-temperature mechanical property of this high-strength temperature-resistant cast magnesium alloys T6 state is:
Tensile strength: 350MPa, yield strength: 240MPa, unit elongation: 3.2%, Young's modulus: 52GPa.
During 300 DEG C of this high-strength temperature-resistant cast magnesium alloys T6 state, mechanical property is:
Tensile strength: 300MPa, yield strength: 210MPa, unit elongation: 12%, Young's modulus: 47GPa.
Embodiment 2
Component and the mass percent thereof of the high-strength temperature-resistant cast magnesium alloys of the present embodiment are: 8%Y, 4%Zn, 1%Si, 0.7%Zr, 0.1%B, and the total amount of Impurity Fe, Cu and Ni is less than 0.03%, and surplus is Mg.
The preparation method of the magnesium alloy of the present embodiment comprises melting technology and thermal treatment process two parts.
Described melting technology is at SF
6and CO
2carry out under mixed gas protected condition, step is as follows: (1) prepares burden: raw material adopts pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt, 60wt%Mg-40wt%B
2o
3, prepare burden according to described mass percent; (2) material is dried: by pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt and 60wt%Mg-40wt%B
2o
3220 DEG C of preheatings 3 hours; (3) molten Mg and Si: adopt crucible electrical resistance furnace by the pure magnesium fusing after drying, after pure magnesium ingot fusing, add pure silicon at 760 DEG C, and every 5 minutes to Melt Stirring once; (4) add Zn and Y: in the magnesium liquid of 690 DEG C, add pure Zn, after magnesium liquid temp reaches 740 DEG C, add Mg-25wt%Y master alloy; (5) Zr and B is added: until pure Mg, pure Si, pure Zn and Mg-25wt%Y are warming up to 780 DEG C after melting completely time, add 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt and 60wt%Mg-40wt%B
2o
3; (6) pour into a mould: treat 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt and 60wt%Mg-40wt%B
2o
3melt completely, after stirring, magnesium liquid temp is risen to 770 DEG C of insulations 25 minutes, be then cooled to 760 DEG C, continuous electrorefining 15 minutes, be warming up to 770 DEG C after refining and leave standstill 25 minutes, after 740 DEG C, skim surface scum after leaving standstill and cast, casting mould is heated to 250 DEG C in advance;
Described thermal treatment process comprises three-stage solution process and ageing treatment, and wherein, three-stage solution is treated to: be first incubated 1 hour to magnesium alloy middle temperature 350 DEG C, be placed in rapidly 80 DEG C of hot water and quench after taking-up; Then secondary high temperature 460 DEG C insulation 4 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench; Finally high temperature 520 DEG C insulation 4 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench; Ageing treatment is: to the alloy after solution treatment 200 DEG C of insulations 24 hours, after taking out, air cooling is to room temperature.
The room-temperature mechanical property of this high-strength temperature-resistant cast magnesium alloys T6 state is:
Tensile strength: 370MPa, yield strength: 260MPa, unit elongation: 2.5%, Young's modulus: 59GPa.
During 300 DEG C of this high-strength temperature-resistant cast magnesium alloys T6 state, mechanical property is:
Tensile strength: 320MPa, yield strength: 220MPa, unit elongation: 10%, Young's modulus: 50GPa.
Embodiment 3
Component and the mass percent thereof of the high-strength temperature-resistant cast magnesium alloys of the present embodiment are: 5%Y, 2.5%Zn, 2%Si, 0.5%Zr, 0.2%B, and the total amount of Impurity Fe, Cu and Ni is less than 0.03 %, and surplus is Mg.
The preparation method of the magnesium alloy of the present embodiment comprises melting technology and thermal treatment process two parts.
Described melting technology is at SF
6and CO
2carry out under mixed gas protected condition, step is as follows: (1) prepares burden: raw material adopts pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, 60wt%
K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt, 60wt%Mg-40wt%B
2o
3, prepare burden according to described mass percent; (2) material is dried: by pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt and 60wt%Mg-40wt%B
2o
3210 DEG C of preheatings 4 hours; (3) molten Mg and Si: adopt crucible electrical resistance furnace by the pure magnesium fusing after drying, after pure magnesium ingot fusing, add pure silicon at 750 DEG C, and every 5 minutes to Melt Stirring once; (4) add Zn and Y: in the magnesium liquid of 680 DEG C, add pure Zn, after magnesium liquid temp reaches 730 DEG C, add Mg-25wt%Y master alloy; (5) Zr and B is added: until pure Mg, pure Si, pure Zn and Mg-25wt%Y are warming up to 770 DEG C after melting completely time, add 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt and 60wt%Mg-40wt%B
2o
3; (6) pour into a mould: treat 60wt%K
2zrCl
6-20wt%LiCl-20wt%CaF
2mixing salt and 60wt%Mg-40wt%B
2o
3melt completely, after stirring, magnesium liquid temp is risen to 760 DEG C of insulations 25 minutes, be then cooled to 750 DEG C, continuous electrorefining 15 minutes, be warming up to 770 DEG C after refining and leave standstill 25 minutes, after 730 DEG C, skim surface scum after leaving standstill and cast, casting mould is heated to 235 DEG C in advance;
Described thermal treatment process comprises three-stage solution process and ageing treatment, and wherein, three-stage solution is treated to: be first incubated 1 hour to magnesium alloy middle temperature 325 DEG C DEG C, be placed in rapidly 80 DEG C of hot water and quench after taking-up; Then secondary high temperature 430 DEG C DEG C insulation 4 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench; Finally high temperature 500 DEG C DEG C insulation 12 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench; Ageing treatment is: to the alloy after solution treatment 220 DEG C of insulations 16 hours, after taking out, air cooling is to room temperature.
The room-temperature mechanical property of this high-strength temperature-resistant cast magnesium alloys T6 state is:
Tensile strength: 360MPa, yield strength: 247MPa, unit elongation: 3.3%, Young's modulus: 62GPa.
During 300 DEG C of this high-strength temperature-resistant cast magnesium alloys T6 state, mechanical property is:
Tensile strength: 315MPa, yield strength: 212MPa, unit elongation: 14%, Young's modulus: 52GPa.
Claims (6)
1. a high-strength temperature-resistant cast magnesium alloys, it is characterized in that: each component of described cast magnesium alloys and mass percent thereof are: 2 ~ 8%Y, 1 ~ 4%Zn, 1 ~ 3%Si, 0.3 ~ 0.7%Zr, 0.1 ~ 0.3%B, the total amount of Impurity Fe, Cu and Ni is less than 0.03%, and surplus is Mg.
2. the preparation method of high-strength temperature-resistant cast magnesium alloys according to claim 1, is characterized in that comprising melting technology and thermal treatment process, and when wherein carrying out melting technology, Y adds with the form of Mg-25wt %Y master alloy, and Zr is with K
2zrCl
6-LiCl-CaF
2mixing salt form add, B is with Mg-B
2o
3form add, Mg, Zn and Si add with the form of pure Mg, pure Zn and pure Si respectively.
3. the preparation method of high-strength temperature-resistant cast magnesium alloys according to claim 2, is characterized in that:
Described melting technology is at SF
6and CO
2carry out under mixed gas protected condition, step is as follows:
(1) prepare burden: raw material adopts pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, K
2zrCl
6-LiCl-CaF
2mixing salt, Mg-B
2o
3, prepare burden according to described mass percent;
(2) material is dried: by pure Mg, pure Zn, pure Si, Mg-25wt%Y master alloy, K
2zrCl
6-LiCl-CaF
2mixing salt and Mg-B
2o
3200 ~ 220 DEG C of preheatings 2 ~ 4 hours;
(3) molten Mg and Si: adopt crucible electrical resistance furnace by the pure magnesium fusing after drying, after pure magnesium fusing, add pure silicon under 740 ~ 760 DEG C of conditions, and every 5 minutes to Melt Stirring once, obtain magnesium liquid;
(4) Zn and Y is added: be add pure Zn under the condition of 670 ~ 690 DEG C at magnesium liquid temp, after magnesium liquid temp reaches 720 ~ 740 DEG C, add Mg-25wt%Y master alloy;
(5) Zr and B is added: until pure Mg, pure Si, pure Zn and Mg-25wt%Y are warming up to 760 ~ 780 DEG C after melting completely time, add K
2zrCl
6-LiCl-CaF
2mixing salt and Mg-B
2o
3, obtain mixed solution;
(6) pour into a mould: treat K
2zrCl
6-LiCl-CaF
2mixing salt and Mg-B
2o
3melt completely, after stirring, mixeding liquid temperature is risen to 750 ~ 770 DEG C of insulations 25 minutes, then 740 ~ 760 DEG C are cooled to, continuous electrorefining 15 minutes, be warming up to 770 DEG C after refining and leave standstill 25 minutes, after 720 ~ 740 DEG C, skim surface scum after leaving standstill and cast, obtain magnesium alloy, casting mould is heated to 220 ~ 250 DEG C in advance.
4. the preparation method of high-strength temperature-resistant cast magnesium alloys according to claim 2, is characterized in that:
The step of described thermal treatment process is as follows: (1) three-stage solution process: be first incubated 1 hour to magnesium alloy middle temperature 300 ~ 350 DEG C, be placed in rapidly 80 DEG C of hot water and quench after taking-up; Then secondary high temperature 400 ~ 460 DEG C insulation 4 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench; Finally high temperature 480 ~ 520 DEG C insulation 4 ~ 20 hours, be placed in rapidly 80 DEG C of hot water after taking-up and quench;
(2) ageing treatment: to the alloy after solution treatment 200 ~ 240 DEG C of insulations 8 ~ 24 hours, after taking out, air cooling is to room temperature.
5. the preparation method of the high-strength temperature-resistant cast magnesium alloys according to Claims 2 or 3 or 4, is characterized in that: described K
2zrCl
6-LiCl-CaF
2mixing salt concrete composition be 60wt%K
2zrCl
6-20wt %LiCl-20wt%CaF
2.
6. the preparation method of the high-strength temperature-resistant cast magnesium alloys according to Claims 2 or 3 or 4, is characterized in that: described Mg-B
2o
3concrete composition be 60wt%Mg-40wt%B
2o
3.
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| CN114277297A (en) * | 2021-12-22 | 2022-04-05 | 重庆大学 | Magnesium-based composite material with improved heat resistance and preparation method thereof |
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| CN104928548A (en) * | 2015-06-16 | 2015-09-23 | 上海交通大学 | High-strength heat-resisting magnesium alloy suitable for sand casting and preparation method thereof |
| CN104988371A (en) * | 2015-06-16 | 2015-10-21 | 上海交通大学 | Rear-earth magnesium alloy suitable for sand mould casting and preparation method for rear-earth magnesium alloy |
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| CN105483485A (en) * | 2015-12-08 | 2016-04-13 | 上海交通大学 | High-strength cast magnesium alloy containing Zn and heavy rare-earth Gd and preparation method of high-strength cast magnesium alloy |
| CN107058924A (en) * | 2017-04-19 | 2017-08-18 | 南通河海大学海洋与近海工程研究院 | Regulate and control high-strength high-plastic heat resistance magnesium alloy of LPSO structures and nanoprecipitation phase and preparation method thereof |
| CN107641750A (en) * | 2017-08-21 | 2018-01-30 | 中北大学 | High-strength and high-modulus amount magnesium alloy of in-situ authigenic precipitated phase enhancing and preparation method thereof |
| CN107641750B (en) * | 2017-08-21 | 2019-09-27 | 中北大学 | The high-strength and high-modulus amount magnesium alloy and preparation method thereof of in-situ authigenic precipitated phase enhancing |
| CN114277297A (en) * | 2021-12-22 | 2022-04-05 | 重庆大学 | Magnesium-based composite material with improved heat resistance and preparation method thereof |
| CN114277297B (en) * | 2021-12-22 | 2023-04-07 | 重庆大学 | Magnesium-based composite material with improved heat resistance and preparation method thereof |
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