CN103146973A - High-temperature-resistant rare earth magnesium alloy - Google Patents
High-temperature-resistant rare earth magnesium alloy Download PDFInfo
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- CN103146973A CN103146973A CN2013100822270A CN201310082227A CN103146973A CN 103146973 A CN103146973 A CN 103146973A CN 2013100822270 A CN2013100822270 A CN 2013100822270A CN 201310082227 A CN201310082227 A CN 201310082227A CN 103146973 A CN103146973 A CN 103146973A
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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 the metallic substance technical field, be specifically related to a kind of high temperature resistant magnesium-rare earth.
Background technology
Magnesium is the lightest structural metallic materials, uses increasing on automobile.Automobile adopts the magnesium alloy can loss of weight, has reduced simultaneously exhaust emissions, the research and development of therefore carrying out magnesium alloy for save energy, suppress the environmental pollution important in inhibiting.But the intensity of magnesium alloy and resistance toheat are not good, seriously hinder its application in aerospace, military project, automobile and other industry, and the intensity and the resistance toheat that therefore improve magnesium alloy are the important topics in Study for Magnesium Composites field.
Existing heat resistance magnesium alloy is mainly started with from restriction dislocation motion and reinforcement crystal boundary, by suitable alloying, introduce the high second-phase of thermostability, reduce element in magnesium matrix rate of diffusion or improve grain boundary structure state and tissue morphology etc., realize improving the purpose of magnesium alloy heat resistance and high temperature creep drag.At present, in all alloying elements, rare earth (RE) is to improve the most effective alloying element of magnesium alloy resistance toheat.Most of rare earth element has larger solid solubility limit in magnesium, and descends with temperature, and 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 (being mainly crystal boundary) disperse, the high-melting-point rare earth compound, still can pinning intracrystalline dislocation and Grain Boundary Sliding when high temperature, thus the hot strength of magnesium alloy improved; Simultaneously, the rate of diffusion of rare earth element in magnesium matrix is slower, and this makes the Mg-RE alloy be suitable for long term operation under comparatively high temps.Mg-RE(such as Mg-Y are) alloy is important heat resistance magnesium alloy system, has higher hot strength and good creep-resistant property.Current Magnesium Alloys Components 200～300 ℃ of lower long term operations is Mg-RE and is associated gold, and Mg-RE is tied to form an important alloy system into the development high-strength heat-resistant magnesium alloy.
Present business heat resistance magnesium alloy such as WE43, the main deficiency of its existence is that resistance toheat is stable not, during high temperature, strength degradation is more, can't satisfy fully aerospace, military project, automobile and other industry wide temperature range particularly when 200 ℃～300 ℃ are used to the higher requirement of intensity.
Summary of the invention
The purpose of this invention is to provide a kind of high temperature resistant magnesium-rare earth, have stable high-temperature performance, have higher high temperature tensile strength.
In order to realize above purpose, the technical solution adopted in the present invention is: a kind of high temperature resistant magnesium-rare earth, component by following mass percent forms: 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 are 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 the raw material melting and casting and is made through Overheating Treatment by Mg, Sb and master alloy Mg-Y, Mg-Nd, Mg-Sm.By the 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 ℃, is cast in steel die, gets as-cast magnesium alloy, after heat-treat.Described thermal treatment is that cast alloy is carried out solution treatment and ageing treatment successively.The treatment temp of described solution treatment is 525 ℃, and the treatment time is 8 hours.The treatment temp of described ageing treatment is 225 ℃, and the treatment time is 16 hours.
Alloy compositions of the present invention is Mg-Y-Nd-Sm-Sb.It is the first component that the present invention adopts Y, the maximum solid solution degree of Y in Mg sosoloid is 12wt%, for guaranteeing that alloy obtains good Precipitation and strengthens and solid solution strengthening effect, the add-on of Y is not less than 3wt%, and increase too many for fear of alloy density, and the undue embrittlement of alloy, 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 be used in combination, Nd, Sm can reduce the solid solubility of Y in Mg, thereby increase the Precipitation strengthening effect of Y; Nd, the Sm maximum solid solution degree in Mg is respectively 3.6wt%, 5.7wt%, and for the content of rare earth that guarantees that strengthening effect and reduce are total, therefore Nd of the present invention, Sm add-on be not all higher than 2.5wt%; Add a small amount of Sb can improve the mechanical property of magnesium alloy, but the Sb crystal grain thinning improve room temperature strength, also can generate high-melting-point strengthening phase Mg with Mg
3Sb
2, improve hot strength, can affect castability and mechanical property but Sb is excessive, therefore Sb add-on of the present invention is not higher than 1wt%; Heavy alloyed room temperature and hot strength are further put forward in the strengthening effect of comprehensive utilization rare earth element y, Nd, Sm and element sb.
High temperature resistant magnesium-rare earth of the present invention, component is Mg-Y-Nd-Sm-Sb, has higher Testing Tensile Strength at Elevated Temperature, in the time of 300 ℃, tensile strength has stable high-temperature performance more than still can reaching 200MPa; High temperature resistant magnesium-rare earth 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 at aspects such as aerospace, automotive industry, weaponrys.
Embodiment
The invention will be further described below in conjunction with embodiment.
The raw material magnesium (Mg) that relates in the specific embodiment of the invention, antimony (Sb), master alloy Mg-Y, Mg-Nd, Mg-Sm are the commercially available prod.The purity of described raw material is 99.8% Mg, 99.5% Sb, 99.8% Mg-25%Y, Mg-20%Nd and Mg-25%Sm.
Embodiment 1
The high temperature resistant magnesium-rare earth of the present embodiment is comprised of the component of following mass percent: 5%Y, and 1%Nd, 1%Sm, 0.5%Sb, impurity element S i, Fe, Cu and Ni total amount are less than 0.2%, and surplus is Mg.The mass percent sum of Y, Nd and Sm is 7%.
The high temperature resistant magnesium-rare earth of the present embodiment is the raw material melting and casting and is made through Overheating Treatment by Mg, Sb and master alloy Mg-Y, Mg-Nd, Mg-Sm.By the 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 ℃, is cast in steel die; namely get the Mg-5Y-1Nd-1Sm-0.5Sb as-cast magnesium alloy; after heat-treat, thermal treatment process is: 525 ℃ of solution treatment 8 hours, 225 ℃ of isothermal agings were processed 16 hours.
Embodiment 2
The high temperature resistant magnesium-rare earth of the present embodiment is comprised of the component of following mass percent: 4%Y, and 0.5%Nd, 2.5%Sm, 0.2%Sb, impurity element S i, Fe, Cu and Ni total amount are less than 0.2%, and surplus is Mg.The mass percent sum of Y, Nd and Sm is 7%.
The high temperature resistant magnesium-rare earth of the present embodiment is the raw material melting and casting and is made through Overheating Treatment by Mg, Sb and master alloy Mg-Y, Mg-Nd, Mg-Sm.By the 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 ℃, is cast in steel die; namely get the Mg-4Y-0.5Nd-2.5Sm-0.2Sb as-cast magnesium alloy; after heat-treat, thermal treatment process is: 525 ℃ of solution treatment 8 hours, 225 ℃ of isothermal agings were processed 16 hours.
Embodiment 3
The high temperature resistant magnesium-rare earth of the present embodiment is comprised of the component of following mass percent: 3%Y, and 2.5%Nd, 0.5%Sm, 1%Sb, impurity element S i, Fe, Cu and Ni total amount are less than 0.2%, and surplus is Mg.The mass percent sum of Y, Nd and Sm is 6%.
The high temperature resistant magnesium-rare earth of the present embodiment is the raw material melting and casting and is made through Overheating Treatment by Mg, Sb and master alloy Mg-Y, Mg-Nd, Mg-Sm.By the 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 ℃, is cast in steel die; namely get the Mg-3Y-2.5Nd-0.5Sm-1Sb as-cast magnesium alloy; after heat-treat, thermal treatment process is: 525 ℃ of solution treatment 8 hours, 225 ℃ of isothermal agings were processed 16 hours.
Experimental example
Embodiment 1～3 high temperature resistant magnesium-rare earth of gained is carried out tensile strength test, test method is: with embodiment 1～3 high temperature resistant magnesium-rare earth of gained, be processed into 5 times of standard tensile samples according to standard GB/T 6397-86 " metal stretching experimental sample ", stretch on Japanese Shimadzu AG-I250kN electronic tensile test machine, rate of extension is 1mm/min; When carrying out drawing by high temperature, be incubated 10 minutes, then stretch.The tensile strength test result is as shown in table 1:
The tensile strength test result of the high temperature resistant magnesium-rare earth of table 1 embodiment 1～3
as can be seen from Table 1, in room temperature, 200 ℃, 300 ℃ the time, the tensile strength of the high temperature resistant magnesium-rare earth of embodiment 1～3 is not less than the tensile strength of commercial heat resistance magnesium alloy WE43 at these temperature, in the time of 300 ℃, the tensile strength of commercial heat resistance magnesium alloy WE43 drops to 160MPa, and more than the tensile strength of the high temperature resistant magnesium-rare earth of embodiments of the invention 1～3 still remains on 200MPa, the high temperature resistant magnesium-rare earth of embodiments of the invention 1～3 is described, when having higher tensile strength when keeping between room temperature to 250 ℃, between 250 ℃ to 300 ℃, its tensile strength descends slowly, and during to 300 ℃, its tensile strength is still more than 200MPa, have higher use temperature and higher Testing Tensile Strength at Elevated Temperature, have stable high-temperature performance, can satisfy aerospace, military project, automobile and other industry wide temperature range particularly when 200 ℃～300 ℃ are used to the requirement of intensity.
Claims (3)
1. high temperature resistant magnesium-rare earth, it is characterized in that: the component by following mass percent forms: 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 are less than 0.2%, and surplus is Mg.
2. high temperature resistant magnesium-rare earth according to claim 1, it is characterized in that: the mass percent sum of described Y, Nd and Sm is 6%～7%.
3. high temperature resistant magnesium-rare earth according to claim 1, it is characterized in that: described magnesium-rare earth is the raw material melting and casting and is made through Overheating Treatment by Mg, Sb and master alloy Mg-Y, Mg-Nd, Mg-Sm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757512A (en) * | 2014-01-02 | 2014-04-30 | 河南科技大学 | Creep-resistant rare earth magnesium alloy |
| CN103774019A (en) * | 2014-01-02 | 2014-05-07 | 河南科技大学 | Heatproofing magnesium alloy with stable high-temperature strength |
| CN104294132A (en) * | 2014-06-06 | 2015-01-21 | 河南科技大学 | High-strength creep resistant magnesium alloy |
| CN104328317A (en) * | 2014-11-26 | 2015-02-04 | 杨攀 | Rear-earth magnesium alloy and manufacturing process thereof |
| CN104818415A (en) * | 2015-06-01 | 2015-08-05 | 河南科技大学 | High-strength heat-resistant magnesium alloy |
| CN107099714A (en) * | 2017-05-17 | 2017-08-29 | 河南科技大学 | A kind of magnesium-rare earth and preparation method thereof |
| CN107267829A (en) * | 2017-07-04 | 2017-10-20 | 河南科技大学 | A kind of magnesium alloy containing rare earth high-strength and preparation method thereof |
| CN107267830A (en) * | 2017-07-10 | 2017-10-20 | 河南科技大学 | A kind of heat resistance magnesium alloy and preparation method thereof |
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| CN101532107A (en) * | 2009-04-13 | 2009-09-16 | 河南科技大学 | Heat resisting rare earth magnesium alloy and preparation method thereof |
| CN102212728A (en) * | 2011-05-22 | 2011-10-12 | 河南科技大学 | Heat-resistant rare earth magnesium alloy with stable strength |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757512A (en) * | 2014-01-02 | 2014-04-30 | 河南科技大学 | Creep-resistant rare earth magnesium alloy |
| CN103774019A (en) * | 2014-01-02 | 2014-05-07 | 河南科技大学 | Heatproofing magnesium alloy with 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 |
| CN104328317A (en) * | 2014-11-26 | 2015-02-04 | 杨攀 | Rear-earth magnesium alloy and manufacturing process thereof |
| CN104818415A (en) * | 2015-06-01 | 2015-08-05 | 河南科技大学 | High-strength heat-resistant magnesium alloy |
| CN107099714A (en) * | 2017-05-17 | 2017-08-29 | 河南科技大学 | A kind of magnesium-rare earth and preparation method thereof |
| CN107267829A (en) * | 2017-07-04 | 2017-10-20 | 河南科技大学 | A kind of magnesium alloy containing rare earth high-strength 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 |
| CN107267830A (en) * | 2017-07-10 | 2017-10-20 | 河南科技大学 | A kind of heat resistance magnesium alloy 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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