CN103757510A - Multi-element heat-resistant magnesium alloy - Google Patents

Multi-element heat-resistant magnesium alloy Download PDF

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Publication number
CN103757510A
CN103757510A CN201410001120.3A CN201410001120A CN103757510A CN 103757510 A CN103757510 A CN 103757510A CN 201410001120 A CN201410001120 A CN 201410001120A CN 103757510 A CN103757510 A CN 103757510A
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magnesium alloy
alloy
resistant magnesium
heat
treatment
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CN201410001120.3A
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CN103757510B (en
Inventor
陈君
李全安
朱宏喜
陈晓亚
张清
李梅菊
付三玲
刘文闯
陈雷雷
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Henan University of Science and Technology
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Henan University of Science and Technology
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Abstract

The invention discloses a multi-element heat-resistant magnesium alloy which consists of the following components in percentage by mass: 5-7% of Al, 0.5-1.2% of Y, 0.3-1% of Nd, 0.5-1% of Ca, 0.5-1% of Sb, less than 0.2% of impurity elements Fe, Cu and Ni in total and the balance of Mg. With the components Mg, Al, Y, Nd, Ca and Sb, the multi-element heat-resistant magnesium alloy disclosed by the invention has good high-temperature tensile strength and high-temperature creep resistance; the elements are reasonably matched; on the basis of controlling the content of the alloy elements and particularly the content of rare-earth elements, the cheap metals Ca and Sb are introduced, so that the alloy cost is reduced; the synergistic reinforcing effect of the rare-earth elements Y and Nd, the alkaline-earth element Ca and the element Sb is comprehensively utilized, so that the high-temperature mechanical properties of the magnesium alloy are remarkably improved. Thus, the magnesium alloy is suitable for popularization and application.

Description

A kind of multicomponent heat-resistant magnesium alloy
Technical field
The invention belongs to magnesium alloy technical field, be specifically related to a kind of multicomponent heat-resistant magnesium alloy.
Background technology
Magnesium alloy, as the lightest structural metallic materials, has castability, the machining property of high specific tenacity and specific rigidity, excellence and fills type mobility, and prospect has a very wide range of applications.Magnesium alloy is applied increasingly on automobile in recent years, and automobile adopts the magnesium alloy can loss of weight, has reduced exhaust emissions simultaneously, the research and development of therefore carrying out magnesium alloy for save energy, suppress environmental pollution important in inhibiting.But the intensity of magnesium alloy and resistance toheat are not good, the AZ91 magnesium alloy of for example common designations, due to its main strengthening phase Mg 17al 12fusing point be only 438 ℃, while using under higher than 100 ℃ of environment, strengthening phase is easily softening, causes alloy high-temp strength degradation, has seriously limited its range of application, the intensity and the resistance toheat that therefore improve magnesium alloy are the important topics in Study for Magnesium Composites field.
To the research of the heat resistance magnesium alloy with high-temperature creep resistance, given great attention both at home and abroad, successively developed Mg-Al-Si, Mg-Al-RE, Mg-Al-Ca, Mg-Al-Sn, Mg-Al-Ca-RE, the serial heat resistance magnesium alloy such as Mg-Y-Nd, but in above-mentioned developed heat resistance magnesium alloy, be really applied only have a minority, as the AE42 alloy in Mg-Al-RE series, WE43 in Mg-Y-Nd series and WE54, AS41 in AX51 in Mg-Al-Ca series and Mg-Al-Si series and AS21 etc., these heat resistance magnesium alloys that are applied are also because different problems is restricted range of application separately, as AE42 and WE43 etc., all contain the precious metal elements such as a large amount of RE, cost of alloy is higher has limited its widespread use, and for AS41 and AS21 alloy containing Si, in its tissue, there is the Mg2Si phase of thick Chinese character shape, damaged its mechanical property.Therefore, high, the intensity of research and development economy and the heat resistance magnesium alloy that plasticity is good, creep property is excellent, can expand the range of application of magnesium alloy to a great extent, has very important significance.
Summary of the invention
The object of this invention is to provide a kind of multicomponent heat-resistant magnesium alloy with good hot strength and high-temperature creep resistance.
In order to realize above object, the technical solution adopted in the present invention is: a kind of multicomponent heat-resistant magnesium alloy, component by following mass percent forms: 5%~7%Al, 0.5%~1.2%Y, 0.3%~1%Nd, 0.5%~1%Ca, 0.5%~1%Sb, the total amount of Impurity Fe, Cu and Ni is less than 0.2%, and surplus is Mg.
Described multicomponent heat-resistant magnesium alloy is raw material melting and casting by Mg, Al, Sb and master alloy Mg-Y, Mg-Nd, Mg-Ca and makes through Overheating 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 Al, 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, obtain.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 420 ℃, and the treatment time is 20 hours.The treatment temp of described ageing treatment is 220 ℃, and the treatment time is 16 hours.
Multicomponent heat-resistant magnesium alloy component of the present invention is Mg-Al-Y-Nd-Ca-Sb.Al is alloying element important in magnesium alloy, has very large solid solubility in magnesium matrix, can play obvious strengthening effect, its strengthening effect surface both ways, the one, by form Mg 17al 12the second-phase strengthening of phase, the 2nd, the solution strengthening by Al atom in magnesium matrix.Due to Mg 17al 12be easy to mutually soften, therefore the content of Al is controlled at below 7% in alloy, but too low Al can damage the castability of magnesium alloy, and the content of Al should be lower than 5%, therefore the Al content in multicomponent heat-resistant magnesium alloy is 5%~7%.Multi-element alloyed is the effective ways that improve Mg-Al series magnesium alloy, in all alloying elements, RE element is to improve the most effective alloying element of magnesium alloy resistance toheat, RE mainly strengthens to improve magnesium alloy high-temperature behavior by solution strengthening and Second Phase Precipitation, the present invention improves Magnesium Alloy and high-temperature behavior by adding a small amount of RE element Y and Nd, the excessive membership increase alloy density that adds of RE, the more important thing is and can improve cost of alloy, therefore the addition of Y and Nd is respectively 0.5%~1.2% and 0.3%~1% in the present invention.Can generate high-melting-point strengthening phase Mg a small amount of adding of Ca with Mg 2ca, improves hot strength and creep-resistant property, but Ca excessive can affect castability, therefore in the present invention Ca add-on not higher than 1wt%.Add a small amount of Sb can improve the mechanical property of 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 excessive can affect castability and mechanical property, therefore in the present invention Sb add-on not higher than 1wt%.
Multicomponent heat-resistant magnesium alloy of the present invention, component is Mg-Al-Y-Nd-Ca-Sb, has good Testing Tensile Strength at Elevated Temperature and high-temperature creep resistance; Each element rational proportion, controlling each alloying element particularly on the basis of ree content, introduce cheap metal Ca and Sb, reduced cost of alloy, comprehensive utilization rare earth element y, Nd, the cooperative reinforcing effect of alkaline earth element Ca and element sb, has significantly improved the mechanical behavior under high temperature of magnesium alloy, is applicable to applying.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
The raw material magnesium (Mg), aluminium (Al), antimony (Sb) and the master alloy Mg-Y that in the specific embodiment of the present invention, relate to, Mg-Nd, Mg-Ca is commercially available prod.
Embodiment 1
The multicomponent heat-resistant magnesium alloy of the present embodiment, is comprised of the component of following mass percent: 5%Al, and 0.5%Y, 1%Nd, 0.5%Ca, 1%Sb, the total amount of Impurity Fe, Cu and Ni is less than 0.2%, and surplus is Mg.
Described multicomponent heat-resistant magnesium alloy is raw material melting and casting by Mg, Al, Sb and master alloy Mg-Y, Mg-Nd, Mg-Ca and makes through Overheating 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 Al, 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, obtain.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 420 ℃, and the treatment time is 20 hours.The treatment temp of described ageing treatment is 220 ℃, and the treatment time is 16 hours.
The present embodiment multicomponent heat-resistant magnesium alloy tensile strength test is implemented according to standard GB/T 6397-86 < < metal stretching experimental sample > >, and high temperature creep test is implemented according to standard GB/T/T2039-1997 < < metal stretching creep and rupture test method > >.
Mechanical property to the present embodiment gained multicomponent heat-resistant magnesium alloy is tested, and result is as following table 1.
The mechanical experimental results of table 1 embodiment 1 gained multicomponent heat-resistant magnesium alloy
Project Tensile strength (MPa) Elongation (%) 100h creep strain amount (50Mpa)
Room temperature 246 11.2
150℃ 215 13.5 0.29%
200℃ 179 16.3 1.24%
Embodiment 2
The multicomponent heat-resistant magnesium alloy of the present embodiment, is comprised of the component of following mass percent: 6%Al, and 0.8%Y, 0.7%Nd, 0.8%Ca, 0.8%Sb, the total amount of Impurity Fe, Cu and Ni is less than 0.2%, and surplus is Mg.
Described multicomponent heat-resistant magnesium alloy is raw material melting and casting by Mg, Al, Sb and master alloy Mg-Y, Mg-Nd, Mg-Ca and makes through Overheating 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 Al, 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, obtain.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 420 ℃, and the treatment time is 20 hours.The treatment temp of described ageing treatment is 220 ℃, and the treatment time is 16 hours.
The mechanic property test method of the present embodiment gained multicomponent heat-resistant magnesium alloy is with embodiment 1, and mechanical experimental results is as following table 2.
The mechanical experimental results of table 2 embodiment 2 gained multicomponent heat-resistant magnesium alloys
Project Tensile strength (MPa) Elongation (%) 100h creep strain amount (50Mpa)
Room temperature 255 10.2
150℃ 209 12.4 0.27%
200℃ 184 15.3 1.08%
Embodiment 3
The multicomponent heat-resistant magnesium alloy of the present embodiment, is comprised of the component of following mass percent: 7%Al, and 1.2%Y, 0.3%Nd, 1%Ca, 0.5%Sb, the total amount of Impurity Fe, Cu and Ni is less than 0.2%, and surplus is Mg.
Described multicomponent heat-resistant magnesium alloy is raw material melting and casting by Mg, Al, Sb and master alloy Mg-Y, Mg-Nd, Mg-Ca and makes through Overheating 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 Al, 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, obtain.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 420 ℃, and the treatment time is 20 hours.The treatment temp of described ageing treatment is 220 ℃, and the treatment time is 16 hours.
The mechanic property test method of the present embodiment gained multicomponent heat-resistant magnesium alloy is with embodiment 1, and mechanical experimental results is as following table 3.
The mechanical experimental results of table 3 embodiment 3 gained multicomponent heat-resistant magnesium alloys
Project Tensile strength (MPa) Elongation (%) 100h creep strain amount (50Mpa)
Room temperature 249 9.9
150℃ 203 12.8 0.34%
200℃ 172 14.9 1.43%

Claims (2)

1. a multicomponent heat-resistant magnesium alloy, is characterized in that: the component by following mass percent forms: 5%~7%Al, and 0.5%~1.2%Y, 0.3%~1%Nd, 0.5%~1%Ca, 0.5%~1%Sb, the total amount of Impurity Fe, Cu and Ni is less than 0.2%, and surplus is Mg.
2. multicomponent heat-resistant magnesium alloy according to claim 1, is characterized in that: described multicomponent heat-resistant magnesium alloy is raw material melting and casting by Mg, Al, Sb and master alloy Mg-Y, Mg-Nd, Mg-Ca and makes through Overheating Treatment.
CN201410001120.3A 2014-01-02 2014-01-02 A kind of multicomponent heat-resistant magnesium alloy Expired - Fee Related CN103757510B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104233027A (en) * 2014-06-06 2014-12-24 河南科技大学 Flame-retardant high-strength magnesium alloy and preparation method thereof
CN104294124A (en) * 2014-06-03 2015-01-21 河南科技大学 Low-rare earth high-strength magnesium alloy
CN104674092A (en) * 2015-02-27 2015-06-03 河南科技大学 Mg-Al-Zn heat-resistant magnesium alloy containing Sm and preparation method of alloy
CN109852856A (en) * 2019-04-17 2019-06-07 上海交通大学 A kind of high tough high-modulus metal mold gravity casting magnesium alloy and preparation method thereof
CN111155011A (en) * 2020-02-21 2020-05-15 江苏理工学院 High-performance Mg-Al-Ca 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
CN102181763A (en) * 2011-05-22 2011-09-14 河南科技大学 Rare earth magnesium alloy with stable high-temperature strength

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104294124A (en) * 2014-06-03 2015-01-21 河南科技大学 Low-rare earth high-strength magnesium alloy
CN104233027A (en) * 2014-06-06 2014-12-24 河南科技大学 Flame-retardant high-strength magnesium alloy and preparation method thereof
CN104233027B (en) * 2014-06-06 2017-03-22 河南科技大学 Flame-retardant high-strength magnesium alloy and preparation method thereof
CN104674092A (en) * 2015-02-27 2015-06-03 河南科技大学 Mg-Al-Zn heat-resistant magnesium alloy containing Sm and preparation method of alloy
CN109852856A (en) * 2019-04-17 2019-06-07 上海交通大学 A kind of high tough high-modulus metal mold gravity casting magnesium alloy and preparation method thereof
CN109852856B (en) * 2019-04-17 2021-03-19 上海交通大学 High-strength, high-toughness and high-modulus metal mold gravity casting magnesium alloy and preparation method thereof
CN111155011A (en) * 2020-02-21 2020-05-15 江苏理工学院 High-performance Mg-Al-Ca magnesium alloy and preparation method thereof

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