CN103757512A - Creep-resistant rare earth magnesium alloy - Google Patents
Creep-resistant rare earth magnesium alloy Download PDFInfo
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- CN103757512A CN103757512A CN201410001139.8A CN201410001139A CN103757512A CN 103757512 A CN103757512 A CN 103757512A CN 201410001139 A CN201410001139 A CN 201410001139A CN 103757512 A CN103757512 A CN 103757512A
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Abstract
The invention discloses a creep-resistant rare earth magnesium alloy consisting of the following components in percentage by weight: 4-6% of Y, 0.5-2% of Zn, 0.5-1.5% of Ca, 0.5-1.2% of Sb and the balance of Mg and inevitable impurities. The creep-resistant rare earth magnesium alloy has very excellent creep resistance; under the condition that the creep temperature is 250 DEG C and the stress is 70MPa, the total amount of creep in 100 hours is not more than 0.24%, and the steady-state creep rate is 8.48*10<-9>s<-1>, so that the creep performance of the creep-resistant rare earth magnesium alloy is obviously superior to that of a WE43 magnesium alloy; compared with a commercial magnesium alloy namely WE43 alloy, the use level of rare earth in the creep-resistant rare earth magnesium alloy disclosed by the invention is reduced, and an appropriate amount of cheap elements including Ca, Zn, Sb and the like are added into the alloy, so that the cost is obviously reduced, the creep resistance is significantly improved, and the creep-resistant rare earth magnesium alloy has a broad application prospect in the aspects of aerospace, automobile industry, weaponry and the like.
Description
Technical field
The invention belongs to magnesium alloy technical field, be specifically related to a kind of creep resistance magnesium-rare earth.
Background technology
Magnesium and magnesium alloy are the lightest structural metallic materialss in engineering application, application has very significant advantage in a lot of fields, particularly aspect Aeronautics and Astronautics and automobile, motorcycle, high speed light rail train, have and be difficult to alternative advantage, but, the intensity of magnesium alloy and resistance toheat are not good, seriously hinder its application in aerospace, military project, automobile and other industry, the intensity and the resistance toheat that therefore improve magnesium alloy are the important topics of development magnesium alloy materials.
Existing creep resistance Dow metal is mainly started with from restriction dislocation motion and strengthening crystal boundary, by suitable alloying, by introducing the high second-phase of thermostability, reduce the rate of diffusion of element in magnesium matrix or improve the means such as grain boundary structure state and tissue morphology and realize the object that improves magnesium alloy heat resistance and high temperature creep drag.At present, in all alloying elements, rare earth (RE) is that the creep of raising magnesium alloy can the most effective alloying element.Most of rare earth element has larger solid solubility limit in magnesium, and declines with temperature, and solid solubility sharply reduces, and obtains 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, high-melting-point rare earth compound, still can pinning intracrystalline dislocation and Grain Boundary Sliding when high temperature, thus the creep-resistant property of magnesium alloy improved; Meanwhile, the rate of diffusion of rare earth element in magnesium matrix is slower, and this makes Mg-RE alloy be suitable for long term operation under comparatively high temps environment.Mg-RE(as Mg-Y is) alloy is important creep resistance Dow metal system, has higher hot strength and good creep-resistant property.The Magnesium Alloys Components of current long term operation at 200～300 ℃ is Mg-RE and is associated gold, and Mg-RE is tied to form an important alloy system into development creep resistance Dow metal.
As magnesium and rare earth resources big country, China is on the increase in recent years and gos deep into about the research of magnesium-rare earth, and the successful research and development of magnesium-rare earth will contribute to us to utilize this advantage.Current business heat resistance magnesium alloy is as WE43, the main deficiency of its existence is that creep-resistant property is not high, can't meet aerospace, military project, automobile and other industry requirements at the higher level to creep-resistant property when wider range of working temperature is particularly used at 200 ℃-300 ℃ completely.
Summary of the invention
The object of this invention is to provide a kind of creep resistance magnesium-rare earth,
In order to realize above object, the technical solution adopted in the present invention is: a kind of creep resistance magnesium-rare earth, is comprised of the component of following weight percent: 4%～6%Y, 0.5%～2%Zn, 0.5%～1.5%Ca, 0.5%～1.2%Sb, surplus is Mg and inevitable impurity.
Described Y, Zn, the mass percent sum of Ca, Sb are 7%～9%.
In described impurity, the total content of Si, Fe, Cu and Ni is less than 0.2%.
Described creep resistance magnesium-rare earth is raw material melting and casting by magnesium, antimony, zinc and master alloy Mg-Y, Mg-Ca and makes through solid solution and timeliness thermal treatment.
By said components alloyage, its founding is: adopt corundum crucible, medium-frequency induction furnace, at CO
2+ SF
6mixed gas protected lower melting, first adds Mg, adds Zn, Sb and master alloy after fusing, when magnesium liquid is warming up to 750 ℃, is cast in steel die, obtains as-cast magnesium alloy, after heat-treat.Described thermal treatment is that as-cast magnesium alloy is carried out to 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 250 ℃, and the treatment time is 16 hours.
The alloy compositions of creep resistance magnesium-rare earth of the present invention is Mg-Y-Zn-Ca-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 strengthening and solid solution strengthening effect, the add-on of Y is not less than 4wt%, for fear of alloy density, increase too many simultaneously, and the undue embrittlement of alloy, therefore Y add-on of the present invention is not higher than 6wt%; Add a small amount of Zn can improve the creep-resistant property of Mg alloy castings, adding of excessive Zn affects solid solution effect, can not give full play to ageing strengthening effect; Can generate high-melting-point strengthening phase Mg a small amount of adding of Ca with Mg
2ca improves the high-temperature behavior of magnesium alloy, improves hot strength and creep-resistant property, but Ca is excessive, can affect castability, and therefore Ca add-on of the present invention is not higher than 1.5wt%; Add a small amount of Sb, can in matrix, separate out the Mg of thermostability
3sb
2, at high temperature effectively strengthened matrix, suppressed the slippage of crystal boundary under high temperature, Sb add-on of the present invention is not higher than 1.2wt%; The strengthening effect of comprehensive utilization rare earth element (Y), alkaline earth element (Ca) and other elements (Sb, Zn), further carries heavy alloyed creep-resistant property.
Creep resistance magnesium-rare earth of the present invention, alloy compositions is Mg-Y-Zn-Ca-Sb, has very excellent creep-resistant property, in creep temperature, is 250 ℃, and stress is that lower 100 hours total creep amounts of 70MPa condition are not more than 0.24%, and steady state creep speed is 8.48 × 10
-9s
-1; And WE43 magnesium alloy is 250 ℃ in creep temperature, stress is that the 60MPa condition steady state creep speed of lower 100 hours is 4.46 × 10
-8s
-1, creep resistance magnesium-rare earth of the present invention has the creep property that is obviously better than WE43 magnesium alloy.With commercial magnesium alloy WE43 alloy phase ratio, creep resistance Dow metal middle-weight rare earths consumption of the present invention reduces, the cheap elements such as Ca, Zn and Sb have been added in right amount, obviously reduced cost, creep-resistant property significantly improves, and at aspects such as aerospace, automotive industry, weaponrys, has broad application prospects.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
The raw material magnesium (Mg), antimony (Sb), the Zn(zinc that in the specific embodiment of the invention, relate to), master alloy Mg-Y, Mg-Ca are commercially available prod.The purity of described raw material is 99.8% Mg, 99.5% Sb and Zn, 99.8% Mg-20%Y and Mg-25%Ca.
Embodiment 1
The creep resistance magnesium-rare earth of the present embodiment, is comprised of the component of following weight percent: 4%Y, and 2%Zn, 1.5%Ca, 0.5%Sb, surplus is Mg and inevitable impurity.In described impurity, the total content of Si, Fe, Cu and Ni is less than 0.2%.Alloying element total content is 8%.
Described creep resistance magnesium-rare earth is raw material melting and casting by magnesium, antimony, zinc and master alloy Mg-Y, Mg-Ca and makes through solid solution and timeliness thermal treatment.
By said components alloyage, its founding is: adopt corundum crucible, medium-frequency induction furnace, at CO
2+ SF
6mixed gas protected lower melting, first adds Mg, adds Zn, Sb and master alloy after fusing, when magnesium liquid is warming up to 750 ℃, is cast in steel die, obtains as-cast magnesium alloy, after heat-treat.Described thermal treatment is that as-cast magnesium alloy is carried out to 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 250 ℃, and the treatment time is 16 hours.
The present embodiment gained creep resistance magnesium-rare earth, it is 250 ℃ in creep temperature, and stress is that the 70MPa condition total creep amount of lower 100 hours is 0.21%, and steady state creep speed is 7.51 × 10
-9s
-1.
Embodiment 2
The creep resistance magnesium-rare earth of the present embodiment, is comprised of the component of following weight percent: 5%Y, and 1.5%Zn, 1%Ca, 0.8%Sb, surplus is Mg and inevitable impurity.In described impurity, the total content of Si, Fe, Cu and Ni is less than 0.2%.Alloying element total content is 8.3%.
Described creep resistance magnesium-rare earth is raw material melting and casting by magnesium, antimony, zinc and master alloy Mg-Y, Mg-Ca and makes through solid solution and timeliness thermal treatment.
By said components alloyage, its founding is: adopt corundum crucible, medium-frequency induction furnace, at CO
2+ SF
6mixed gas protected lower melting, first adds Mg, adds Zn, Sb and master alloy after fusing, when magnesium liquid is warming up to 750 ℃, is cast in steel die, obtains as-cast magnesium alloy, after heat-treat.Described thermal treatment is that as-cast magnesium alloy is carried out to 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 250 ℃, and the treatment time is 16 hours.
The present embodiment gained creep resistance magnesium-rare earth, it is 250 ℃ in creep temperature, and stress is that the 70MPa condition total creep amount of lower 100 hours is 0.24%, and steady state creep speed is 8.48 × 10
-9s
-1.
Embodiment 3
The creep resistance magnesium-rare earth of the present embodiment, is comprised of the component of following weight percent: 6%Y, and 0.5%Zn, 0.5%Ca, 1.2%Sb, surplus is Mg and inevitable impurity.In described impurity, the total content of Si, Fe, Cu and Ni is less than 0.2%.Alloying element total content is 8.2%.
Described creep resistance magnesium-rare earth is raw material melting and casting by magnesium, antimony, zinc and master alloy Mg-Y, Mg-Ca and makes through solid solution and timeliness thermal treatment.
By said components alloyage, its founding is: adopt corundum crucible, medium-frequency induction furnace, at CO
2+ SF
6mixed gas protected lower melting, first adds Mg, adds Zn, Sb and master alloy after fusing, when magnesium liquid is warming up to 750 ℃, is cast in steel die, obtains as-cast magnesium alloy, after heat-treat.Described thermal treatment is that as-cast magnesium alloy is carried out to 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 250 ℃, and the treatment time is 16 hours.
The present embodiment gained creep resistance magnesium-rare earth, it is 250 ℃ in creep temperature, and stress is that the 70MPa condition total creep amount of lower 100 hours is 0.19%, and steady state creep speed is 6.18 × 10
-9s
-1.
Claims (4)
1. a creep resistance magnesium-rare earth, is characterized in that: the component by following weight percent forms: 4%～6%Y, and 0.5%～2%Zn, 0.5%～1.5%Ca, 0.5%～1.2%Sb, surplus is Mg and inevitable impurity.
2. creep resistance magnesium-rare earth according to claim 1, is characterized in that: described Y, Zn, the mass percent sum of Ca, Sb are 7%～9%.
3. creep resistance magnesium-rare earth according to claim 1, is characterized in that: in described impurity, the total content of Si, Fe, Cu and Ni is less than 0.2%.
4. according to the creep resistance magnesium-rare earth described in claim 1,2 or 3, it is characterized in that: described creep resistance magnesium-rare earth is raw material melting and casting by magnesium, antimony, zinc and master alloy Mg-Y, Mg-Ca and makes through solid solution and timeliness thermal treatment.
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| CN201410001139.8A CN103757512B (en) | 2014-01-02 | 2014-01-02 | A kind of Creep-resistant rare earth magnesium alloy |
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| CN201410001139.8A CN103757512B (en) | 2014-01-02 | 2014-01-02 | A kind of Creep-resistant rare earth magnesium alloy |
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| CN103757512A true CN103757512A (en) | 2014-04-30 |
| CN103757512B CN103757512B (en) | 2016-08-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107964603A (en) * | 2017-11-24 | 2018-04-27 | 湖北工业大学 | A kind of synthetic method of Mg (Zn)-MgSb intermetallic compound structure materials |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1329530A1 (en) * | 2002-01-10 | 2003-07-23 | Dead Sea Magnesium Ltd. | High temperature resistant magnesium alloys |
| CN102181763A (en) * | 2011-05-22 | 2011-09-14 | 河南科技大学 | Rare earth magnesium alloy with stable high-temperature strength |
| US8293031B2 (en) * | 2006-03-31 | 2012-10-23 | Biotronik Vi Patent Ag | Magnesium alloy and the respective manufacturing method |
| CN103146973A (en) * | 2013-03-14 | 2013-06-12 | 河南科技大学 | High-temperature-resistant rare earth magnesium alloy |
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2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1329530A1 (en) * | 2002-01-10 | 2003-07-23 | Dead Sea Magnesium Ltd. | High temperature resistant magnesium alloys |
| US8293031B2 (en) * | 2006-03-31 | 2012-10-23 | Biotronik Vi Patent Ag | Magnesium alloy and the respective manufacturing method |
| CN102181763A (en) * | 2011-05-22 | 2011-09-14 | 河南科技大学 | Rare earth magnesium alloy with stable high-temperature strength |
| CN103146973A (en) * | 2013-03-14 | 2013-06-12 | 河南科技大学 | High-temperature-resistant rare earth magnesium alloy |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107964603A (en) * | 2017-11-24 | 2018-04-27 | 湖北工业大学 | A kind of synthetic method of Mg (Zn)-MgSb intermetallic compound structure materials |
| CN107964603B (en) * | 2017-11-24 | 2019-06-25 | 湖北工业大学 | A kind of synthetic method of Mg (Zn)-MgSb intermetallic compound structure material |
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| CN103757512B (en) | 2016-08-17 |
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Granted publication date: 20160817 Termination date: 20170102 |