CN106350720B - Heat resistance casting magnesium alloy containing hafnium and preparation method thereof - Google Patents
Heat resistance casting magnesium alloy containing hafnium and preparation method thereof Download PDFInfo
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- CN106350720B CN106350720B CN201610905918.XA CN201610905918A CN106350720B CN 106350720 B CN106350720 B CN 106350720B CN 201610905918 A CN201610905918 A CN 201610905918A CN 106350720 B CN106350720 B CN 106350720B
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- heat resistance
- magnesium alloy
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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
- 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
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
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Abstract
The invention discloses a kind of heat resistance casting magnesium alloy containing hafnium and preparation method thereof, the alloy each component is by weight percentage：Zn 1.5~8.0%, Hf 0.1~3.0%, Gd 0.1~2.0%, Zr 0.1~1.0%, surplus are Mg and impurity, impurity summation≤0.15%.The addition of Hf elements can make alloy form a large amount of Dispersed precipitates in matrix, precipitated phase containing Hf with high thermostability, improve the yield strength of alloy, improve the high-temperature creep resistance of alloy in addition simultaneously, Hf and Gd elements add simultaneously with Zn to form the orderly stacking provisions of a large amount of long periods in intra-die, further improve the high-temperature creep resistance of alloy.
Description
Technical field
The invention belongs to field of magnesium alloy, and in particular to a kind of heat resistance casting magnesium alloy containing hafnium.
Background technology
With the fast development of China's aerospace industry, car industry, the light weight chemical conversion of the vehicles such as spacecraft and automobile
For urgent need to resolve the problem of, magnesium alloy has broad application prospects as most promising light-alloy, and at present on automobile
Magnesium alloy component is essentially all die casting, in existing cast magnesium alloy, with being most widely used for the alloys such as AZ91D, AM50,
These magnesium alloys have good mechanical property, decay resistance and die casting performance.However, when operating temperature is more than 120 DEG C,
The croop property of these alloys drastically declines, therefore is not used to produce car transmissions part.It is existing automobile-used resistance at present
Hot magnesium alloy mainly has Mg-Al-RE, Mg-Al-Ca, Mg-Zn-Al-Ca, Mg-Al-Ca-RE, Mg-Al-Sr, Mg-Al-Sn, Mg-
The heat resistance magnesium alloys such as Zn-Al, Mg-Zn-RE, Mg-Zn-Si and Mg-Zn-Sn.
Rare earth element is considered as the important element for improving magnesium alloy heat resistance, such as or commercial applications
WE54 and WE43.One kind is developed in patent CN 1804083A and contains Heat Resistant Rare Earth-magnesium Alloy, consisting of：2~10% mass ratioes
Gd, Y, the Gd and Y gross mass of 3~12% mass ratioes account for the 13~14% of the alloy gross mass, and 0.4~0.7% matter
The Zr and≤0.3% of amount ratio active element (being chosen any one kind of them in Zn, Ag, Cu, Sr, Ca, Ti, Bi, Cd), or 0.6~1.5%
Mn and the active element no more than 0.3%, remaining is magnesium.The prismatic surface that the precipitated phase of the magnesium-rare earth prolongs matrix separates out, energy
Enough basal slips for effectively hindering dislocation, tensile strength is more than 180MPa at 300 DEG C.But precipitated phase can be rapid at 300 DEG C
Grow up, so this magnesium alloy drastically declines in 300 DEG C of creep-resistant property.
So it is under the high temperature conditions to be highly desirable still with the magnesium alloy of preferable creep-resistant property to develop a kind of
's.
The content of the invention
In view of this, it is an object of the invention to provide a kind of heat resistance casting magnesium alloy containing hafnium, by adding hafnium, gadolinium and zinc
Element can improve the high-temperature creep resistance of alloy, and present invention also offers the preparation method of above-mentioned magnesium alloy.
To reach above-mentioned purpose, the invention provides following technical scheme：
1st, heat resistance casting magnesium alloy containing hafnium, each component are by weight percentage：Zn 1.5~8.0%, Hf 0.1~
3.0%, Gd 0.1~2.0%, Zr 0.1~1.0%, surplus are Mg and impurity, impurity summation≤0.15%.
Preferably, each component is by weight percentage：Zn 6.2%, Hf 0.7%, Gd 0.4%, Zr 0.33%, it is other
Impurity element≤0.15%, surplus Mg.
Preferably, each component is by weight percentage：Zn 4.6%, Hf 0.2%, Gd 1.5%, Zr 0.38%, it is other
Impurity element≤0.15%, surplus Mg.
Preferably, each component is by weight percentage：Zn 2.1%, Hf 2.7%, Gd 0.25%, Zr 0.45%, its
Its impurity element≤0.15%, surplus Mg.
Preferably, each component is by weight percentage：Zn 7.1%, Hf 1.8%, Zr 0.44%, other impurity elements
≤ 0.15%, surplus Mg.
Preferably, impurity element includes Fe, Cu, Ni.
It is furthermore preferred that by weight percentage, Fe<0.005%, Cu<0.015%, Ni<0.002%.
2nd, the preparation method of the heat resistance casting magnesium alloy containing hafnium, is concretely comprised the following steps：Pure magnesium is heated to completely
After fusing, technical pure Zn is added at 700 DEG C, after melt temperature reaches 720 DEG C, Mg-Hf and Mg-Gd intermediate alloys is added, treats
Melt temperature gos up after intermediate alloy fusing adds Mg-Zr intermediate alloys to 780 DEG C, and stirring 2min makes it fully melt, then
780 DEG C are warming up to, 750 DEG C is cooled to after being incubated 20min, refines 6min, 20min is stood after refining, treats that molten metal temperature cools down
Surface scum is skimmed to 740 DEG C to be cast.
The beneficial effects of the present invention are：Heat resistance casting magnesium alloy containing hafnium disclosed by the invention, the addition of Hf or Gd elements
The precipitated phase for prolonging prismatic surface growth can be produced, and the precipitated phase has excellent heat endurance at 300 DEG C, improves the anti-compacted of alloy
Become performance, on the one hand Zn addition can generate the higher phases of rich Zn second of fusing point near the crystal boundary of alloy, play pinning crystal boundary
Effect, while Zn and Hf and Gd collective effects can form the orderly stacking provisions of a large amount of long periods, and the structure has altogether with Mg matrixes
Case relation, the basal slip of dislocation can be hindered, strengthen matrix, further increase the high-temperature creep resistance of alloy.In addition,
Add Zr as grain refiner can notable crystal grain thinning, improve the yield strength of alloy.The resistance to hot-cast disclosed by the invention containing hafnium
The extensive use of the alloy in the automotive industry can be turned at 275~300 DEG C, steady operation under the conditions of 50MPa by making magnesium alloy
May.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below：
Fig. 1 represents the metal die schematic diagram that alloy casting uses；
Fig. 2 represents the metallograph of alloy described in embodiment 1；
Fig. 3 represents the metallograph of alloy described in embodiment 2；
Fig. 4 represents the metallograph of alloy described in embodiment 3；
Fig. 5 represents the metallograph of alloy described in embodiment 4.
Embodiment
The preferred embodiments of the present invention are described in detail below.The experiment side of unreceipted actual conditions in embodiment
Method, generally according to normal condition or according to the condition proposed by manufacturer.
Alloy preparation method is as follows：
Pure magnesium is heated to add industrial-purity zinc after being completely melt, after melt temperature reaches 720 DEG C, adds Mg-
Hf and/or Mg-Gd intermediate alloys, melt temperature gos up after intermediate alloy fusing adds Mg-Zr intermediate alloys to 780 DEG C,
Stirring 2min makes it fully melt, then is warming up to 780 DEG C, is cooled to 750 DEG C after being incubated 20min, refines 6min, stood after refining
20min, treat that molten metal temperature is cooled to 740 DEG C and skims surface scum and cast.Fig. 1 represents the metal pattern that alloy casting uses
Has schematic diagram.
Each embodiment and WE54 alloying components are as shown in the table, and component content is represented with percentage by weight.
Note："~" represents not add in table.
The room temperature tensile intensity of WE54 alloys is 283MPa, yield strength 179MPa, elongation percentage 3.9%；300
DEG C, yield strength 126MPa, elongation percentage 8.6%；At 300 DEG C, under the conditions of 50MPa, the creep compliance of 100 hours is 0.74%.
The metallograph of alloy described in embodiment 1 is as shown in Fig. 2 the Alloy At Room Temperature tensile strength is 291MPa, yield strength
For 208MPa, elongation percentage 3.1%；At 300 DEG C, yield strength 151MPa, elongation percentage 3.9%；At 275 DEG C, 50MPa conditions
Under, the creep compliance of 100 hours is 0.12%；At 300 DEG C, under the conditions of 50MPa, the creep compliance of 100 hours is 0.21%.
The metallograph of alloy described in embodiment 2 is as shown in figure 3, the Alloy At Room Temperature tensile strength is 307MPa, yield strength
For 216MPa, elongation percentage 3.9%；At 300 DEG C, yield strength 164MPa, elongation percentage 4.6%；At 275 DEG C, 50MPa conditions
Under, the creep compliance of 100 hours is 0.13%, and at 300 DEG C, under the conditions of 50MPa, the creep compliance of 100 hours is 0.18%.
The metallograph of alloy described in embodiment 3 is as shown in figure 4, the Alloy At Room Temperature tensile strength is 336MPa, yield strength
For 241MPa, elongation percentage 2.5%；At 300 DEG C, yield strength 203MPa, elongation percentage 3.2%；At 275 DEG C, 50MPa conditions
Under, the creep compliance of 100 hours is 0.07%；At 300 DEG C, under the conditions of 50MPa, the creep compliance of 100 hours is 0.09%.
For the metallograph of alloy described in embodiment 4 as shown in figure 5, the room temperature tensile intensity of the alloy is 309MPa, surrender is strong
Spend for 213MPa, elongation percentage 4.4%；At 300 DEG C, yield strength 184MPa, elongation percentage 4.6%；At 275 DEG C, 50MPa conditions
Under, the creep compliance of 100 hours is 0.13%；At 300 DEG C, under the conditions of 50MPa, the creep compliance of 100 hours is 0.18%.
It can be seen that by above example, high temperature (300 DEG C) tensile property and creep-resistant property of alloy prepared by the present invention
It is significantly increased compared with WE54.Because the addition of Hf or Gd elements can produce the precipitated phase for prolonging prismatic surface growth, and the analysis
Go out mutually has excellent heat endurance at 300 DEG C, improves the creep-resistant property of alloy, Zn addition on the one hand can be in the crystalline substance of alloy
Boundary nearby generates the higher phases of rich Zn second of fusing point, plays a part of pinning crystal boundary, while Zn can shape with Hf and Gd collective effects
Into the orderly stacking provisions of a large amount of long periods, the basal slip of dislocation can be hindered, strengthens matrix, further increases the height of alloy
Warm nature energy.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (8)
1. heat resistance casting magnesium alloy containing hafnium, it is characterised in that each component is by weight percentage：Zn 1.5~8.0%, Hf 0.1
~3.0%, Gd 0.1~2.0%, Zr 0.1~1.0%, surplus are Mg and impurity, impurity summation≤0.15%.
2. heat resistance casting magnesium alloy containing hafnium according to claim 1, it is characterised in that each component is by weight percentage：
Zn 6.2%, Hf 0.7%, Gd 0.4%, Zr 0.33%, other impurity element≤0.15%, surplus Mg.
3. heat resistance casting magnesium alloy containing hafnium according to claim 1, it is characterised in that each component is by weight percentage：
Zn 4.6%, Hf 0.2%, Gd 1.5%, Zr 0.38%, other impurity element≤0.15%, surplus Mg.
4. heat resistance casting magnesium alloy containing hafnium according to claim 1, it is characterised in that each component is by weight percentage：
Zn 2.1%, Hf 2.7%, Gd 0.25%, Zr 0.45%, other impurity element≤0.15%, surplus Mg.
5. heat resistance casting magnesium alloy containing hafnium according to claim 1, it is characterised in that each component is by weight percentage：
Zn 7.1%, Hf 1.8%, Zr 0.44%, other impurity element≤0.15%, surplus Mg.
6. heat resistance casting magnesium alloy containing hafnium according to claim 1, it is characterised in that impurity element includes Fe, Cu, Ni.
7. heat resistance casting magnesium alloy containing hafnium according to claim 6, it is characterised in that by weight percentage, Fe<
0.005%, Cu<0.015%, Ni<0.002%.
8. the preparation method of the heat resistance casting magnesium alloy containing hafnium described in any one of claim 1~7, it is characterised in that specific step
Suddenly it is：Pure magnesium is heated to after being completely melt, technical pure Zn is added at 700 DEG C, after melt temperature reaches 720 DEG C, adds
Enter Mg-Hf and Mg-Gd intermediate alloys, melt temperature gos up to 780 DEG C to add among Mg-Zr and closed after intermediate alloy fusing
Gold, stirring 2min makes it fully melt, then is warming up to 780 DEG C, is cooled to 750 DEG C after being incubated 20min, 6min is refined, after refining
20min is stood, treats that molten metal temperature is cooled to 740 DEG C and skims surface scum and is cast.
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| CN201610905918.XA CN106350720B (en) | 2016-10-17 | 2016-10-17 | Heat resistance casting magnesium alloy containing hafnium and preparation method thereof |
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| CN201610905918.XA CN106350720B (en) | 2016-10-17 | 2016-10-17 | Heat resistance casting magnesium alloy containing hafnium and preparation method thereof |
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| CN106350720B true CN106350720B (en) | 2017-12-22 |
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| CN107475589B (en) * | 2017-08-08 | 2020-08-04 | 上海大学 | Mg-L a-Zr rare earth magnesium-based alloy and preparation method thereof |
| CN109082571A (en) * | 2018-09-19 | 2018-12-25 | 广州宇智科技有限公司 | A kind of heat resistance and the casting magnesium alloy with liquid phase spinodal decomposition type |
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| CN101705404A (en) * | 2003-11-26 | 2010-05-12 | 河村能人 | High strength and high toughness magnesium alloy and method of producing the same |
| WO2006036033A1 (en) * | 2004-09-30 | 2006-04-06 | Yoshihito Kawamura | High-strength and high-toughness metal and process for producing the same |
| JP4849402B2 (en) * | 2006-09-15 | 2012-01-11 | トヨタ自動車株式会社 | High strength magnesium alloy and method for producing the same |
| CN100595305C (en) * | 2008-03-20 | 2010-03-24 | 上海交通大学 | Creep resistance magnesium alloy and manufacture method thereof |
| JP2012214853A (en) * | 2011-04-01 | 2012-11-08 | Kumamoto Univ | Magnesium alloy and method for producing the same |
| EP2987875B1 (en) * | 2013-04-15 | 2018-10-10 | National University Corporation Kumamoto University | Fire-resistant magnesium alloy and production method therefor |
| CN104046873A (en) * | 2014-07-01 | 2014-09-17 | 张家港市佳晟机械有限公司 | Deforming magnesium alloy for aviation |
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