CN104294132A - High-strength creep resistant magnesium alloy - Google Patents
High-strength creep resistant magnesium alloy Download PDFInfo
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- CN104294132A CN104294132A CN201410251345.4A CN201410251345A CN104294132A CN 104294132 A CN104294132 A CN 104294132A CN 201410251345 A CN201410251345 A CN 201410251345A CN 104294132 A CN104294132 A CN 104294132A
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- 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
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
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Abstract
The invention discloses a high-strength creep resistant magnesium alloy. The magnesium alloy comprises, by mass, 4.0-5.0% of Y, 1.5-2.5% of Sm, 0.2-0.5% of Sb, and the balance of Mg and inevitable impurities. The component of the high-strength creep resistant magnesium alloy is Mg-Y-Sm-Sb, the high-strength creep resistant magnesium alloy has high high-temperature strength and excellent high temperature creep resistance, has a tensile strength at 300DEG C of 180MPa or more, and has a steady creep rate under 300DEG C/50MPa conditions of 4.0*10<-8> s<-1> or less, so the work safety and reliability of the magnesium alloy under high temperature conditions is guaranteed; and the species of alloy elements, especially rare earth elements is less, and the content is low, so the melting and casting difficulty of the magnesium alloy is greatly reduced, the quality of the alloy is well controlled, the production cost is low, and the alloy has wide application prospects in the aviation and spaceflight fields, the automobile industry and the like.
Description
Technical field
The invention belongs to technical field of alloy material, be specifically related to a kind of high-strength creep resistant magnesium alloy.
Background technology
Mg-based hydrogen storage is structural metallic materials the lightest in engineer applied, all has very significant advantage, particularly in automotive industry, aerospace etc., have irreplaceable advantage in many Application Areass.But the hot strength of ordinary magnesium alloy and creep-resistant property are not good, its application in the field such as automotive industry, aerospace of serious obstruction.Therefore, improve hot strength and the creep-resistant property of magnesium alloy, become the important topic of development magnesium alloy materials.
Existing high-strength creep resistant magnesium alloy research 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 the means such as grain boundary structure state and tissue morphology, realize the object improving magnesium alloy hot strength and creep-resistant property.At present, in all alloying elements, rare earth (RE) improves the most effective alloying element of magnesium alloy high-temperature behavior.Major part rare earth element there is higher solid solubility limit in magnesium, and with temperature decline, solid solubility sharply reduces, 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, be distributed in the disperse of intracrystalline and crystal boundary (mainly crystal boundary), high-melting-point rare earth compound, still pinning effect be can play to intracrystalline dislocation motion and Grain Boundary Sliding when high temperature, thus hot strength and the creep-resistant property of magnesium alloy improved; 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 under comparatively high temps environment.Mg-RE system (as Mg-Y-RE system) alloy is important high-strength creep resistant Magnesium Alloys, and the magnesium alloy 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 development high-strength creep resistant magnesium alloy.
But, magnesium-rare earth existing in the market, often can not take into account higher hot strength and excellent high-temperature creep resistance simultaneously, can't meet completely the field such as aerospace, automotive industry higher temperature particularly when using for 300 DEG C to the requirement of hot strength and creep-resistant property; Meanwhile, also have that alloying element (especially rare earth element) kind is many, content is high, cause melting and casting difficulty comparatively large, the bad control of alloy mass, the problems such as production cost is high, limit development and the application of high-strength creep resistant magnesium alloy.
Summary of the invention
The object of this invention is to provide a kind of high-strength creep resistant magnesium alloy, solve the problem that existing magnesium alloy can not take into account higher hot strength and excellent high-temperature creep resistance simultaneously.
In order to realize above object, the technical solution adopted in the present invention is: a kind of high-strength creep resistant magnesium alloy, is made up of the component of following mass percent: 4.0% ~ 5.0%Y, 1.5% ~ 2.5%Sm, 0.2% ~ 0.5%Sb, surplus is Mg and inevitable impurity.
The total mass per-cent of impurity element S i, Fe, Cu, Ni is less than 0.2%.
The mass percent sum of described Y, Sm is 6.0% ~ 7.0%.
High-strength creep resistant magnesium alloy of the present invention is raw material melting and casting by magnesium, antimony and master alloy Mg-Y, Mg-Sm and forms through solid solution and aging strengthening model.
By mentioned 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-Y-Sm-Sb cast alloy; heat-treat subsequently: 525 DEG C of solution treatment 8 hours, 225 DEG C of ageing treatment 16 hours, obtain described high-strength creep resistant magnesium alloy.
High-strength creep resistant magnesium alloy of the present invention, alloy compositions is Mg-Y-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 solution strengthening and Precipitation strengthening effect, the add-on of Y is not less than 4wt%, simultaneously in order to avoid alloy density increases too many, and alloy is too brittle, therefore Y add-on of the present invention is not higher than 5wt%; Adopt light rare earths Sm and heavy rare earths Y to combinationally use, Sm can reduce the solid solubility of Y in Mg, thus increases the Precipitation strengthening effect of Y; The maximum solid solution degree of Sm in Mg is 5.7wt%, and in order to ensure strengthening effect and reduce rare earth total content as far as possible, therefore Sm add-on of the present invention is not all higher than 2.5wt%; Add a small amount of Sb, the high Mg of thermostability can be separated out in the base
3sb
2, at high temperature effectively strengthen matrix, suppress the slippage of crystal boundary under high temperature, but Sb is excessive can affect castability and mechanical property, therefore Sb add-on of the present invention is not higher than 0.5wt%; The strengthening effect of comprehensive utilization rare earth element y, Sm and other element sbs, carries heavy alloyed hot strength and creep-resistant property further.
High-strength creep resistant magnesium alloy of the present invention, alloy compositions is Mg-Y-Sm-Sb, have higher hot strength and excellent high-temperature creep resistance, when 300 DEG C, tensile strength is not less than 180MPa, and the secondary creep rates under 300 DEG C/50MPa condition is not more than 4.0 × 10
-8s
-1; And commercial magnesium alloy WE43 tensile strength 300 DEG C time is 160MPa, the secondary creep rates under 300 DEG C/50MPa condition is 1.1 × 10
-7s
-1, compared with commercial magnesium alloy WE43, the hot strength of high-strength creep resistant magnesium alloy of the present invention is higher, and the secondary creep rates under high temperature is lower, ensure that safe reliability when magnesium alloy works under the high temperature conditions; Meanwhile, alloying element kind is few, and especially rare earth element kind is few, content is low, and greatly reduce melting and the casting difficulty of magnesium alloy, alloy mass is well controlled, production cost is low, has broad application prospects in aerospace, automotive industry etc.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
The raw material magnesium (Mg) related in embodiment, antimony (Sb) and master alloy Mg-Y, 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 and Mg-25%Sm of 99.8%.
Embodiment 1
The high-strength creep resistant magnesium alloy of the present embodiment, is made up of the component of following mass percent: 4.0%Y, 2.5%Sm, 0.3%Sb, and the total mass per-cent of impurity element S i, Fe, Cu, Ni is less than 0.2%, and surplus is Mg.The mass percent sum of described Y, Sm is 6.5%.
The high-strength creep resistant magnesium alloy of the present embodiment is raw material melting and casting by magnesium, antimony and master alloy Mg-Y, Mg-Sm and forms through solid solution and aging strengthening model, is specially:
By mentioned 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-4.0Y-2.5Sm-0.3Sb cast alloy; heat-treat subsequently: 525 DEG C of solution treatment 8 hours, 225 DEG C of ageing treatment 16 hours, obtain described high-strength creep resistant magnesium alloy.
Gained high-strength creep resistant magnesium alloy is carried out stretching and creep test, stretching test method is: according to standard GB/T 6397-86 " metal stretching experimental sample " Processing Criterion tension specimen, Shimadzu AG-I250kN electronic tensile test machine stretches, test temperature is 300 DEG C, and rate of extension is 1mm/min; Creep test method is: according to standard GB/T/T2039-1997 " metal stretching creep and rupture test method " Processing Criterion creep sample, RC-1130 type creep testing machine carries out creep test, creep temperature is 300 DEG C, and creep stress is 50MPa, and creep time is 100 hours.
The present embodiment gained high-strength creep resistant magnesium alloy, when 300 DEG C, tensile strength is 190MPa, and the secondary creep rates under 300 DEG C/50MPa condition is 3.2 × 10
-8s
-1.
Embodiment 2
The high-strength creep resistant magnesium alloy of the present embodiment, is made up of the component of following mass percent: 4.5%Y, 1.5%Sm, 0.5%Sb, and the total mass per-cent of impurity element S i, Fe, Cu, Ni is less than 0.2%, and surplus is Mg.The mass percent sum of described Y, Sm is 6.0%.
The high-strength creep resistant magnesium alloy of the present embodiment is raw material melting and casting by magnesium, antimony and master alloy Mg-Y, Mg-Sm and forms through solid solution and aging strengthening model.Concrete casting method, thermal treatment process and stretching, creep test method are with embodiment 1.
The present embodiment gained high-strength creep resistant magnesium alloy, when 300 DEG C, tensile strength is 180MPa, and the secondary creep rates under 300 DEG C/50MPa condition is 4.0 × 10
-8s
-1.
Embodiment 3
The high-strength creep resistant magnesium alloy of the present embodiment, is made up of the component of following mass percent: 5.0%Y, 2.0%Sm, 0.2%Sb, and the total mass per-cent of impurity element S i, Fe, Cu, Ni is less than 0.2%, and surplus is Mg.The mass percent sum of described Y, Sm is 7.0%.
The high-strength creep resistant magnesium alloy of the present embodiment is raw material melting and casting by magnesium, antimony and master alloy Mg-Y, Mg-Sm and forms through solid solution and aging strengthening model.Concrete casting method, thermal treatment process and stretching, creep test method are with embodiment 1.
The high-strength creep resistant magnesium alloy of the present embodiment, when 300 DEG C, tensile strength is 194MPa, and the secondary creep rates under 300 DEG C/50MPa condition is 2.9 × 10
-8s
-1.
Claims (2)
1. a high-strength creep resistant magnesium alloy, is characterized in that: be made up of the component of following mass percent: 4.0% ~ 5.0%Y, 1.5% ~ 2.5%Sm, 0.2% ~ 0.5%Sb, and surplus is Mg and inevitable impurity.
2. high-strength creep resistant magnesium alloy according to claim 1, is characterized in that: the mass percent sum of described Y, Sm is 6.0% ~ 7.0%.
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| CN201410251345.4A CN104294132A (en) | 2014-06-06 | 2014-06-06 | High-strength creep resistant magnesium alloy |
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|---|---|---|---|
| CN201410251345.4A CN104294132A (en) | 2014-06-06 | 2014-06-06 | High-strength creep resistant magnesium alloy |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101960032A (en) * | 2008-04-01 | 2011-01-26 | 株式会社神户制钢所 | Magnesium alloy and process for producing the same |
| 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 |
| US20130199677A1 (en) * | 2010-05-24 | 2013-08-08 | Commonwealth Scientific And Industrial Research Organisation | Magnesium-based alloy for wrought applications |
-
2014
- 2014-06-06 CN CN201410251345.4A patent/CN104294132A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101960032A (en) * | 2008-04-01 | 2011-01-26 | 株式会社神户制钢所 | Magnesium alloy and process for producing the same |
| US20130199677A1 (en) * | 2010-05-24 | 2013-08-08 | Commonwealth Scientific And Industrial Research Organisation | Magnesium-based alloy for wrought applications |
| 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 |
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Application publication date: 20150121 |
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