CN102212728B - Heat-resistant rare earth magnesium alloy with stable strength - Google Patents
Heat-resistant rare earth magnesium alloy with stable strength Download PDFInfo
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- CN102212728B CN102212728B CN 201110132156 CN201110132156A CN102212728B CN 102212728 B CN102212728 B CN 102212728B CN 201110132156 CN201110132156 CN 201110132156 CN 201110132156 A CN201110132156 A CN 201110132156A CN 102212728 B CN102212728 B CN 102212728B
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Abstract
The invention discloses a heat-resistant rare earth magnesium alloy with stable strength. The alloy consists of the following components in percentage by mass: 4 to 8 percent of Y, 1 to 4 percent of Sm, 0.3 to 1 percent of Ca, 0.3 to 1 percent of Sb and the balance of Mg and inevitable impurities. The rare earth magnesium alloy has extremely stable tensile strength; and in a range of room temperature to 300 DEG C, the tensile strength of the alloy is reduced with low amplitude together with rise of temperature. The highest tensile strength of the rare earth magnesium alloy at room temperature can reach 253MPa, and the tensile strengths of the alloy reach 244MPa, 208MPa and 205MPa at 200 DEG C, 250 DEG C and 300 DEG C respectively. Compared with the commercial heat-resistant magnesium alloy WE54 alloy, the rare earth magnesium alloy has lower cost and more stable high-temperature strength, and has broad application prospect on the aspects of aerospace, automobile industry, military hardware and the like.
Description
Technical field
The present invention relates to a kind of heat resisting magnesium-rare earth alloy of intensity stabilization.
Background technology
Magnesium is the lightest structural metallic materials, on automobile, uses increasing.Automobile adopts the magnesiumalloy can loss of weight, has reduced exhaust emissions simultaneously, therefore carry out the Mg Alloy exploitation for save energy, suppress environmental pollution significance arranged.But the intensity of magnesiumalloy 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 magnesiumalloy are the important topics of development magnesium alloy materials.
Existing heat resistance magnesium alloy is mainly started with from restriction dislocation motion and reinforcement crystal boundary; Through suitable alloying, through introducing the second high phase of thermostability, reduce the rate of diffusion of element in magnesium matrix or improving the purpose that means such as grain boundary structure state and tissue morphology realize improving magnesiumalloy heat resistance and high temperature creep drag.At present, in all alloying elements, rare earth (RE) is to improve the most effectively alloying element of magnesiumalloy resistance toheat.Most of REE has bigger solid solubility limit in magnesium, and descends with temperature, and solid solubility sharply reduces, and can obtain bigger degree of supersaturation, thus in ag(e)ing process subsequently diffusion-precipitation, dystectic rare earth compound phase; The all right crystal grain thinning of REE, raising room temperature strength; And be distributed in intracrystalline and crystal boundary (mainly being crystal boundary) disperse, the HMP rare earth compound; Still can pinning intracrystalline dislocation and crystal boundary slippage when high temperature, thus the hot strength of magnesiumalloy improved; Simultaneously, the rate of diffusion of REE in magnesium matrix is slower, and this makes the Mg-RE alloy be suitable for long term operation under the comparatively high temps environment.Mg-RE (like Mg-Y system) alloy is important heat resistance magnesium alloy system, has higher high temperature strength and good creep-resistant property.It is alloy that current magnesiumalloy component 200～300 ℃ of following long term operations are Mg-RE, and Mg-RE is tied to form an important alloy system into the development high-strength heat-resisting magnesium alloy.
As magnesium and rare earth resources first big country, China is that the research of alloy is on the increase in recent years and is goed deep into about Mg-RE, and the successful research and development of magnesium-rare earth will help us to utilize this advantage.Present commercial heat resistance magnesium alloy such as WE54; The main deficiency of its existence is that resistance toheat is stable inadequately; Strength degradation is more during high temperature, in the time of can't satisfying it fully and in aerospace, military project, automobile and other industry, use under the range of working temperature at broad to the higher requirement of strength stability.
Summary of the invention
The heat resisting magnesium-rare earth alloy that the purpose of this invention is to provide a kind of intensity stabilization improves the strength stability of magnesiumalloy in room temperature to 300 ℃ range of working temperature.
In order to realize above purpose, the technical scheme that the present invention adopted is: a kind of heat resisting magnesium-rare earth alloy of intensity stabilization, form by following component by mass percent: 4～8%Y; 1～4%Sm; 0.3～1%Ca, 0.3～1%Sb, surplus is Mg and unavoidable impurities.
Si, Fe, Cu and Ni total amount are less than 0.2% in the said impurity.
Described Y, the mass percent sum of Sm is 7～9%.
The heat resisting magnesium-rare earth alloy of said intensity stabilization is by magnesium, and antimony and master alloy Mg-Y, Mg-Sm, Mg-Ca are that the raw material melting and casting also forms through solid solution and timeliness thermal treatment.
Alloy compositions of the present invention is Mg-Y-Sm-Ca-Sb.It is 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 timeliness precipitation strength and solid solution strengthening effect, the add-on of Y is not less than 4wt%, and increases too many for fear of alloy density; And the undue embrittlement of alloy, Y add-on of the present invention is not higher than 8wt%; Adopting Sm is second component, and Sm can reduce the solid solubility of Y in Mg, increases the timeliness precipitation strength effect of Y, and the maximum solid solution degree of Sm in Mg is 5.7wt%, and Sm add-on of the present invention is not higher than 4wt%; Add a spot of Ca and not only can improve mechanical property but also can guarantee castability, but the Ca crystal grain thinning improves room temperature strength, also can generate HMP strengthening phase Mg with Mg
2Ca improves hot strength, and Ca add-on of the present invention is not higher than 1wt%; Add a spot of Sb again, Sb add-on of the present invention is not higher than 1wt%; Fully utilize the strengthening effect of REE (Y, Sm), alkaline earth element (Ca) and other elements (Sb), further improve the hot strength of alloy.
The tensile strength of alloy of the present invention is extremely stable, and in room temperature to 300 ℃ scope, the amplitude that tensile strength of alloys reduces along with the rising of temperature is lower than 20%, and in the time of 300 ℃, tensile strength still can reach more than the 200MPa.Under the same conditions, the room temperature tensile strength of WE54 magnesiumalloy is 280MPa, and unit elongation is 4.0%; 200 ℃ of tensile strength are 241MPa, and 250 ℃ of tensile strength are 230MPa, and 300 ℃ of tensile strength drop to 180MPa; From room temperature to 300 ℃, tensile strength reduces and surpasses 30%.
The existing relatively WE54 magnesiumalloy of the heat resisting magnesium-rare earth alloy of the application's intensity stabilization; Hot strength stability has obtained tangible improvement; And the heat resisting magnesium-rare earth alloy rare earth consumption of the application's intensity stabilization still less; Cost is lower, and resistance toheat especially hot strength is more stable, at aspects such as aerospace, automotive industry, weaponrys wide application prospect is arranged.
Embodiment
The raw material magnesium (Mg) that relates in the specific embodiment of the invention, antimony (Sb), Mg-Y, Mg-Sm, Mg-Zr is the commercially available prod.The purity of said raw material is 99.8% Mg, 99.5% Sb, 99.8% Mg-20%Y, 99.8% Mg-25%Sm, 99.8% Mg-25%Ca.
Embodiment 1
The heat resisting magnesium-rare earth alloy of the intensity stabilization of present embodiment is made up of following component by mass percent: 4%Y, and 3%Sm, 0.3%Ca, 1%Sb, surplus is Mg and unavoidable impurities, wherein impurity element Si, Fe, Cu and Ni total amount are less than 0.2%.Rare earth (Y and Sm) total content is 7%.
Press the mentioned component alloyage, its founding is: adopt corundum crucible, medium-frequency induction furnace melting.At CO
2+ SF
6Mixed gas protected magnesium liquid is warming up to 750 ℃ and casts down, and steel die is used in casting.Obtain the Mg-4Y-3Sm-0.3Ca-1Sb as-cast magnesium alloy at last.Thermal treatment process is: 525 ℃ of solution treatment 8 hours, 250 ℃ of isothermal agings were handled 16 hours.
The method of the tensile strength test of present embodiment magnesium-rare earth: the sample after solid solution aging is handled, be processed into 5 times of standard tensile samples according to standard GB 6397-86 " metal stretching experimental sample ".On the accurate universal testing machine of day island proper Tianjin AG-I 250kN, carry out tension test, rate of extension is 1mm/min.During drawing by high temperature, be incubated 10 minutes, stretch again.
The magnesium-rare earth of present embodiment gained, its room temperature tensile strength is 230MPa, and unit elongation is that 4.04%, 200 ℃ tensile strength is 212MPa, and 250 ℃ tensile strength is 206MPa, and tensile strength is still up to arriving 196MPa in the time of 300 ℃.The tensile strength of this instance magnesium-rare earth is in room temperature to 300 ℃, and tensile strength only reduces 34MPa, and is about 15%, and tensile strength is extremely stable, has satisfied its requirement in aerospace, military project, automobile and other industry.
Embodiment 2
The composition of the heat resisting magnesium-rare earth alloy of intensity stabilization of the present invention (weight percent) is: 6%Y, and 2%Sm, 0.8%Ca, 0.5%Sb, surplus is Mg and unavoidable impurities, wherein impurity element Si, Fe, Cu and Ni total amount are less than 0.2%.Rare earth (Y and Sm) total content is 8%.
The melting of present embodiment magnesium-rare earth, thermal treatment and tensile strength test method are with embodiment 1.
The alloy of present embodiment gained, its room temperature tensile strength is 232MPa, and unit elongation is that 3.98%, 200 ℃ of tensile strength is 226MPa, and 250 ℃ of tensile strength are 209MPa, tensile strength 192MPa in the time of 300 ℃.The tensile strength of this instance magnesium-rare earth is in room temperature to 300 ℃, and tensile strength only reduces 40MPa, and is about 17%, and tensile strength is extremely stable, has satisfied its requirement in aerospace, military project, automobile and other industry.
Embodiment 3
The composition of the heat resisting magnesium-rare earth alloy of intensity stabilization of the present invention (weight percent) is: 8%Y, and 1%Sm, 1%Ca, 0.3%Sb, surplus is Mg and unavoidable impurities, wherein impurity element Si, Fe, Cu and Ni total amount are less than 0.2%.Rare earth (Y and Sm) total content is 9%.
The melting of present embodiment magnesium-rare earth, thermal treatment and tensile strength test method are with embodiment 1.
The alloy of present embodiment gained, its room temperature tensile strength is 237MPa, and unit elongation is that 3.62%, 200 ℃ of tensile strength is 206MPa, and 250 ℃ of tensile strength are 202MPa, tensile strength 188MPa in the time of 300 ℃.The tensile strength of this instance magnesium-rare earth is in room temperature to 300 ℃, and tensile strength only reduces 49MPa, and is about 20%, and tensile strength is extremely stable, has satisfied its requirement in aerospace, military project, automobile and other industry.
Embodiment 4
The composition of the heat resisting magnesium-rare earth alloy of intensity stabilization intensity stabilization of the present invention (weight percent) is: 5%Y, and 4%Sm, 0.8%Ca, 0.5%Sb, surplus is Mg and unavoidable impurities, wherein impurity element Si, Fe, Cu and Ni total amount are less than 0.2%.Rare earth (Y and Sm) total content is 9%.
The melting of present embodiment magnesium-rare earth, thermal treatment and tensile strength test method are with embodiment 1.
The alloy of present embodiment gained, its room temperature tensile strength is 243MPa, and unit elongation is that 3.42%, 200 ℃ of tensile strength is 228MPa, and 250 ℃ of tensile strength are 208MPa, tensile strength 205MPa in the time of 300 ℃.The tensile strength of this instance magnesium-rare earth is in room temperature to 300 ℃, and tensile strength only reduces 38MPa, and is about 15%, and tensile strength is extremely stable, has satisfied its requirement in aerospace, military project, automobile and other industry.
Should be noted that at last; Above instance only is illustrative rather than definitive thereof technical scheme of the present invention; Although the present invention is specified with reference to the foregoing description; Those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not break away from any modification or the local replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (2)
1. the heat resisting magnesium-rare earth alloy of an intensity stabilization is characterized in that: be made up of following component by mass percent: 4～8%Y, and 1～4%Sm, 0.3～1%Ca, 0.3～1%Sb, surplus is Mg and unavoidable impurities; Described Y, the mass percent sum of Sm is 7～9%.
2. the heat resisting magnesium-rare earth alloy of intensity stabilization according to claim 1, it is characterized in that: Si, Fe, Cu and Ni total amount are less than 0.2% in the said impurity.
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| CN 201110132156 CN102212728B (en) | 2011-05-22 | 2011-05-22 | Heat-resistant rare earth magnesium alloy with stable strength |
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| CN 201110132156 CN102212728B (en) | 2011-05-22 | 2011-05-22 | Heat-resistant rare earth magnesium alloy with stable strength |
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| CN102212728A CN102212728A (en) | 2011-10-12 |
| CN102212728B true CN102212728B (en) | 2012-12-26 |
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| CN103146973B (en) * | 2013-03-14 | 2015-04-29 | 河南科技大学 | High-temperature-resistant rare earth magnesium alloy |
| CN110423928B (en) * | 2018-02-09 | 2021-03-19 | 河南科技大学 | High-strength flame-retardant magnesium alloy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1127950A1 (en) * | 2000-02-24 | 2001-08-29 | Mitsubishi Aluminum Co.,Ltd. | Die casting magnesium alloy |
| CN101463441A (en) * | 2009-01-15 | 2009-06-24 | 上海交通大学 | Rare earth-containing high strength heat resisting magnesium alloy and preparation thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9502238D0 (en) * | 1995-02-06 | 1995-03-29 | Alcan Int Ltd | Magnesium alloys |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1127950A1 (en) * | 2000-02-24 | 2001-08-29 | Mitsubishi Aluminum Co.,Ltd. | Die casting magnesium alloy |
| CN101463441A (en) * | 2009-01-15 | 2009-06-24 | 上海交通大学 | Rare earth-containing high strength heat resisting magnesium alloy and preparation thereof |
Non-Patent Citations (2)
| Title |
|---|
| LI Da-quan et al.Influence of extrusion temperature on microstructure and mechanical properties of Mg-4Y-4Sm-0.5Zr alloy.《Transaction of Nonferrous Metals Society of China》.2010,第20卷(第7期),第1311-1315页. * |
| 张清 等.Sb合金化在耐热镁合金中的应用.《材料工程》.2009,(第12期), * |
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