CN103146973B - High-temperature-resistant rare earth magnesium alloy - Google Patents
High-temperature-resistant rare earth magnesium alloy Download PDFInfo
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- CN103146973B CN103146973B CN201310082227.0A CN201310082227A CN103146973B CN 103146973 B CN103146973 B CN 103146973B CN 201310082227 A CN201310082227 A CN 201310082227A CN 103146973 B CN103146973 B CN 103146973B
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Abstract
The invention discloses a high-temperature-resistant rare earth magnesium alloy which consists of the following components in percentage by mass: 3-5 percent of Y, 0.5-2.5 percent of Nd, 0.5-2.5 percent of Sm, 0.2-1 percent of Sb, impurity elements Si, Fe, Cu and Ni of which the total amount is less than 0.2 percent, and the balance of Mg. The high-temperature-resistant rare earth magnesium alloy is stable in high-temperature performance and has high high-temperature tensile strength, and the tensile strength can reach over 200Mpa at the temperature of 300 DEG C; and compared with the commercial heat-resistant magnesium alloy WE43 alloy, the high-temperature-resistant rare earth magnesium alloy has high strength performance and high application temperature and has wide application prospect in aspects such as aerospace, automobile industry and military hardware.
Description
Technical field
The invention belongs to technical field of metal, be specifically related to a kind of High-temperature-resrarent rarent earth magnesium alloy.
Background technology
Magnesium is the lightest structural metallic materials, automobile is applied increasing.Automobile adopts magnesium alloy can loss of weight, decreases exhaust emissions simultaneously, therefore carry out the research and development of magnesium alloy for save energy, suppress environmental pollution important in inhibiting.But the intensity of magnesium alloy and resistance toheat are not good, serious hinder its application in aerospace, military project, automobile and other industry, therefore improve the important topic that the intensity of magnesium alloy and resistance toheat are Study for Magnesium Composites fields.
Existing heat resistance magnesium alloy is mainly started with from restriction dislocation motion and strengthening crystal boundary, by suitable alloying, introduce the high second-phase of thermostability, reduce the rate of diffusion of element in magnesium matrix or improve grain boundary structure state and tissue morphology etc., realize the object improving magnesium alloy heat resistance and high temperature creep drag.At present, in all alloying elements, rare earth (RE) improves the most effective alloying element of magnesium alloy resistance toheat.Major part rare earth element there is larger solid solubility limit in magnesium, and with temperature decline, solid solubility sharply reduces, and can obtain larger degree of supersaturation, thus in ag(e)ing process subsequently diffusion-precipitation, dystectic rare earth compound phase; The all right crystal grain thinning of rare earth element, raising room temperature strength, and be distributed in intracrystalline and crystal boundary (mainly crystal boundary) disperse, high-melting-point rare earth compound, still can pinning intracrystalline dislocation and Grain Boundary Sliding when high temperature, thus improve the hot strength of magnesium alloy; Meanwhile, the rate of diffusion of rare earth element in magnesium matrix is comparatively slow, and this makes Mg-RE alloy be suitable for long term operation at relatively high temperatures.Mg-RE(is as Mg-Y system) alloy is important heat resistance magnesium alloy system, has higher hot strength and excellent creep-resistant property.The Magnesium Alloys Components of current long term operation at 200 ~ 300 DEG C is Mg-RE system alloy, and Mg-RE is tied to form an important alloy system into developing high-strength heat-resistant magnesium alloy.
Current business heat resistance magnesium alloy is as WE43, its main deficiency existed is that resistance toheat is stable not, during high temperature, strength degradation is more, can't meet aerospace, military project, automobile and other industry completely in the higher requirement of wide temperature range particularly when using for 200 DEG C ~ 300 DEG C to intensity.
Summary of the invention
The object of this invention is to provide a kind of High-temperature-resrarent rarent earth magnesium alloy, have stable high-temperature performance, there is higher elevated temperature tensile and stretch intensity.
In order to realize above object, the technical solution adopted in the present invention is: a kind of High-temperature-resrarent rarent earth magnesium alloy, be made up of the component of following mass percent: 3% ~ 5%Y, 0.5% ~ 2.5%Nd, 0.5% ~ 2.5%Sm, 0.2% ~ 1%Sb, impurity element S i, Fe, Cu and Ni total amount is less than 0.2%, and surplus is Mg.
The mass percent sum of described Y, Nd and Sm is 6% ~ 7%.
Described magnesium-rare earth is raw material melting and casting by Mg, Sb and master alloy Mg-Y, Mg-Nd, Mg-Sm and is made through Overheating Treatment.By component alloyage, its founding is: adopt corundum crucible, medium-frequency induction furnace, at CO
2+ SF
6(volume ratio 100:1) mixed gas protected lower melting, first adds Mg, adds Sb and master alloy after fusing, when magnesium liquid is warming up to 750 DEG C, is cast in steel die, obtains as-cast magnesium alloy, after heat-treat.Described thermal treatment carries out solution treatment and ageing treatment successively to cast alloy.The treatment temp of described solution treatment is 525 DEG C, and the treatment time is 8 hours.The treatment temp of described ageing treatment is 225 DEG C, and the treatment time is 16 hours.
Alloy compositions of the present invention is Mg-Y-Nd-Sm-Sb.The present invention adopts Y to be the first component, the maximum solid solution degree of Y in Mg sosoloid is 12wt%, for ensureing that alloy obtains good Precipitation strengthening and solid solution strengthening effect, the add-on of Y is not less than 3wt%, and increase too many in order to avoid alloy density, and alloy is too brittle, therefore Y add-on of the present invention is not higher than 5wt%; Adopt light rare earths Nd, Sm and heavy rare earths Y to combinationally use, Nd, Sm can reduce the solid solubility of Y in Mg, thus increase the Precipitation strengthening effect of Y; Nd, Sm maximum solid solution degree in Mg is respectively 3.6wt%, 5.7wt%, and in order to ensure strengthening effect and reduce total content of rare earth as far as possible, therefore Nd, Sm add-on of the present invention is not all higher than 2.5wt%; Add the mechanical property that a small amount of Sb can improve magnesium alloy, Sb can crystal grain thinning, improves room temperature strength, also can generate high-melting-point strengthening phase Mg with Mg
3sb
2, improve hot strength, but Sb is excessive can affect castability and mechanical property, therefore Sb add-on of the present invention is not higher than 1wt%; The strengthening effect of comprehensive utilization rare earth element y, Nd, Sm and element sb, puies forward heavy alloyed room temperature and hot strength further.
High-temperature-resrarent rarent earth magnesium alloy of the present invention, component is Mg-Y-Nd-Sm-Sb, has higher Testing Tensile Strength at Elevated Temperature, and 300 DEG C time, tensile strength still can reach more than 200MPa, has stable high-temperature performance; High-temperature-resrarent rarent earth magnesium alloy of the present invention and commercial heat resistance magnesium alloy WE43 alloy phase ratio, have the use temperature of better strength property and Geng Gao, have broad application prospects in aerospace, automotive industry, weaponry etc.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
The raw material magnesium (Mg) related in the specific embodiment of the invention, antimony (Sb), master alloy Mg-Y, Mg-Nd, Mg-Sm are commercially available prod.The purity of described raw material is the Mg of 99.8%, the Sb of 99.5%, Mg-25%Y, Mg-20%Nd and Mg-25%Sm of 99.8%.
Embodiment 1
The High-temperature-resrarent rarent earth magnesium alloy of the present embodiment, is made up of the component of following mass percent: 5%Y, 1%Nd, 1%Sm, 0.5%Sb, and impurity element S i, Fe, Cu and Ni total amount is less than 0.2%, and surplus is Mg.The mass percent sum of Y, Nd and Sm is 7%.
The High-temperature-resrarent rarent earth magnesium alloy of the present embodiment is raw material melting and casting by Mg, Sb and master alloy Mg-Y, Mg-Nd, Mg-Sm and is made through Overheating Treatment.By component alloyage, its founding is: adopt corundum crucible, medium-frequency induction furnace, at CO
2+ SF
6mixed gas protected lower melting, when magnesium liquid is warming up to 750 DEG C, is cast in steel die; obtain Mg-5Y-1Nd-1Sm-0.5Sb as-cast magnesium alloy; after heat-treat, thermal treatment process is: 525 DEG C of solution treatment 8 hours, 225 DEG C of isothermal aging process 16 hours.
Embodiment 2
The High-temperature-resrarent rarent earth magnesium alloy of the present embodiment, is made up of the component of following mass percent: 4%Y, 0.5%Nd, 2.5%Sm, 0.2%Sb, and impurity element S i, Fe, Cu and Ni total amount is less than 0.2%, and surplus is Mg.The mass percent sum of Y, Nd and Sm is 7%.
The High-temperature-resrarent rarent earth magnesium alloy of the present embodiment is raw material melting and casting by Mg, Sb and master alloy Mg-Y, Mg-Nd, Mg-Sm and is made through Overheating Treatment.By component alloyage, its founding is: adopt corundum crucible, medium-frequency induction furnace, at CO
2+ SF
6mixed gas protected lower melting, when magnesium liquid is warming up to 750 DEG C, is cast in steel die; obtain Mg-4Y-0.5Nd-2.5Sm-0.2Sb as-cast magnesium alloy; after heat-treat, thermal treatment process is: 525 DEG C of solution treatment 8 hours, 225 DEG C of isothermal aging process 16 hours.
Embodiment 3
The High-temperature-resrarent rarent earth magnesium alloy of the present embodiment, is made up of the component of following mass percent: 3%Y, 2.5%Nd, 0.5%Sm, 1%Sb, and impurity element S i, Fe, Cu and Ni total amount is less than 0.2%, and surplus is Mg.The mass percent sum of Y, Nd and Sm is 6%.
The High-temperature-resrarent rarent earth magnesium alloy of the present embodiment is raw material melting and casting by Mg, Sb and master alloy Mg-Y, Mg-Nd, Mg-Sm and is made through Overheating Treatment.By component alloyage, its founding is: adopt corundum crucible, medium-frequency induction furnace, at CO
2+ SF
6mixed gas protected lower melting, when magnesium liquid is warming up to 750 DEG C, is cast in steel die; obtain Mg-3Y-2.5Nd-0.5Sm-1Sb as-cast magnesium alloy; after heat-treat, thermal treatment process is: 525 DEG C of solution treatment 8 hours, 225 DEG C of isothermal aging process 16 hours.
Experimental example
Embodiment 1 ~ 3 gained High-temperature-resrarent rarent earth magnesium alloy is carried out tensile strength test, test method is: by embodiment 1 ~ 3 gained High-temperature-resrarent rarent earth magnesium alloy, 5 times of standard tensile specimen are processed into according to standard GB/T 6397-86 " metal stretching experimental sample ", Japanese Shimadzu AG-I250kN electronic tensile test machine stretches, and rate of extension is 1mm/min; When carrying out drawing by high temperature, 10 minutes are incubated, then stretch.Tensile strength test result is as shown in table 1:
The tensile strength test result of the High-temperature-resrarent rarent earth magnesium alloy of table 1 embodiment 1 ~ 3
As can be seen from Table 1, room temperature, 200 DEG C, 300 DEG C time, the tensile strength of the High-temperature-resrarent rarent earth magnesium alloy of embodiment 1 ~ 3 is not less than commercial heat resistance magnesium alloy WE43 tensile strength at these tem-peratures, 300 DEG C time, the tensile strength of commercial heat resistance magnesium alloy WE43 drops to 160MPa, and the tensile strength of the High-temperature-resrarent rarent earth magnesium alloy of embodiments of the invention 1 ~ 3 still remains on more than 200MPa, the High-temperature-resrarent rarent earth magnesium alloy of embodiments of the invention 1 ~ 3 is described, while there is higher tensile strength time between maintenance room temperature is to 250 DEG C, between 250 DEG C to 300 DEG C, its tensile strength declines slowly, and during to 300 DEG C, its tensile strength is still at more than 200MPa, there is higher use temperature and higher Testing Tensile Strength at Elevated Temperature, have stable high-temperature performance, aerospace can be met, military project, automobile and other industry are in the requirement of wide temperature range particularly when using for 200 DEG C ~ 300 DEG C to intensity.
Claims (2)
1. a High-temperature-resrarent rarent earth magnesium alloy, is characterized in that: be made up of the component of following mass percent: 4%Y, 0.5%Nd, 2.5%Sm, 0.2%Sb, and impurity element S i, Fe, Cu and Ni total amount is less than 0.2%, and surplus is Mg.
2. according to the High-temperature-resrarent rarent earth magnesium alloy described in claim 1, it is characterized in that: described magnesium-rare earth is raw material melting and casting by Mg, Sb and master alloy Mg-Y, Mg-Nd, Mg-Sm and is made through Overheating Treatment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103774019B (en) * | 2014-01-02 | 2016-08-17 | 河南科技大学 | A kind of heat resistance magnesium alloy of stable high-temperature strength |
| CN103757512B (en) * | 2014-01-02 | 2016-08-17 | 河南科技大学 | A kind of Creep-resistant rare earth magnesium alloy |
| CN104294132A (en) * | 2014-06-06 | 2015-01-21 | 河南科技大学 | High-strength creep resistant magnesium alloy |
| CN104328317B (en) * | 2014-11-26 | 2016-08-24 | 衢州市联橙环保科技有限公司 | A kind of magnesium-rare earth and manufacture craft thereof |
| CN104818415A (en) * | 2015-06-01 | 2015-08-05 | 河南科技大学 | High-strength heat-resistant magnesium alloy |
| CN107099714B (en) * | 2017-05-17 | 2018-09-21 | 河南科技大学 | A kind of magnesium-rare earth and preparation method thereof |
| CN107267829B (en) * | 2017-07-04 | 2018-12-07 | 河南科技大学 | One kind magnesium alloy containing rare earth high-strength and preparation method thereof |
| CN107267830B (en) * | 2017-07-10 | 2018-12-07 | 河南科技大学 | A kind of heat resistance magnesium alloy and preparation method thereof |
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| CN100523244C (en) * | 2006-08-25 | 2009-08-05 | 北京有色金属研究总院 | High-strength heat-resistant magnesium alloy and smelting method thereof |
| KR100860091B1 (en) * | 2007-04-05 | 2008-09-25 | 주식회사 지알로이테크놀로지 | Mg alloy having low c/a ratio and method of manufacturing the mg alloy sheets |
| CN101532107B (en) * | 2009-04-13 | 2010-12-08 | 河南科技大学 | Heat resisting rare earth magnesium alloy and preparation method thereof |
| CN102212728B (en) * | 2011-05-22 | 2012-12-26 | 河南科技大学 | Heat-resistant rare earth magnesium alloy with stable strength |
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