CN100467647C - High-strength heat-proof compression casting magnesium alloy and preparation method thereof - Google Patents

High-strength heat-proof compression casting magnesium alloy and preparation method thereof Download PDF

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Publication number
CN100467647C
CN100467647C CNB2007100110196A CN200710011019A CN100467647C CN 100467647 C CN100467647 C CN 100467647C CN B2007100110196 A CNB2007100110196 A CN B2007100110196A CN 200710011019 A CN200710011019 A CN 200710011019A CN 100467647 C CN100467647 C CN 100467647C
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magnesium alloy
compression casting
strength
casting
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CN101037753A (en
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王峰
林立
刘正
于宝义
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Wanfeng Magnesium Industry Sci. & Tech. Development Co., Ltd., Weihai
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Shenyang University of Technology
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Abstract

A compression casting magnesium alloy with high strength heat resisting and its producing method are disclosed. The invention provides a method of producing compression casting magnesium alloy with high performance by adding metal calcium Ca and lanthanon Y into AZ91 alloy in order to solve the problem that the existing AZ91 magnesium alloy has poor heat resisting. Its composition is, based on mass percent, 8.5-9.5% Al, 0.4-0.9%Zn, 0.1-0.4%Mn, 0.5-1.5%Ca, 0.5-1.5%Y, the impurity: Si <= 0.02, Fe <= 0.003, Ni <= 0.003, Cu <= 0.003, and the residuel of Mg. The alloy of the invention has the advantages of simple treatment for fused body, good compression casting processability, higher mechanical behavior under high temperature and low cost, and is prone to be widely used, in particular is suitable for commerical producing in large scale and has market potential. The obdurability parameters under room temperature and high temperature of the alloy is higher than commercial AZ91 alloy.

Description

A kind of high-strength heat-proof compression casting magnesium alloy and preparation method thereof
Technical field
What the present invention relates to is a kind of high-strength heat-proof compression casting magnesium alloy and preparation method thereof, belongs to metal material field.
Background technology
Magnesium alloy is the lightest structural metallic materials in the present practical application, has that density is little, specific tenacity is high, machinability is good and advantage such as damping property is good, is widely used in space flight and aviation, in automobile and the 3C Product.Wherein, the AZ91 alloy is that current room temperature is used maximum diecast magnesium alloys, higher room temperature strength of its tool and good castability, but because its main strengthening phase Mg 17Al 12Thermostability can not surpass 120 ℃ than its life-time service temperature of official post, thereby limited the application of this alloy.In existing heat resistance magnesium alloy, AS system (as AS21, AS41) and AE system (as AE42) though alloy has very high hot strength, the die cast poor-performing is not suitable for this magnesium alloy of die casting and uses maximum moulding processs.In addition, Mg-Zn-Zr system and Mg-RE-Zr are alloy owing to contain more noble metal Zr and RE, make its price higher, and the melting technology more complicated, use and are subjected to certain limitation.
Summary of the invention
The objective of the invention is to weak point, high-strength heat-proof compression casting magnesium alloy of a kind of Ca of containing, Y and preparation method thereof is provided at the existing above-mentioned performance of magnesium alloy.By on the basis of AZ91 alloy, add an amount of calcium metal (Ca) and rare earth element yttrium (Y), improve the obdurability of alloy, and make it to have higher high temperature strength, to satisfy the needs of above-mentioned industrial circle.
The present invention's preparation contains the high-strength heat-proof compression casting magnesium alloy of Ca, Y.Its method is to be mother alloy with industrial magnesium alloy AZ91 ingot casting, and to wherein adding metal Ca and Y, it is 1.233~1.5 that both add-ons are controlled at Ca by mass percentage respectively, and Y is 1.312~1.5.The chemical ingredients of high-strength heat-proof compression casting magnesium alloy of the present invention is by mass percentage: 8.916~9.5 Al, 0.4~0.9 Zn, 0.1~0.5 Mn, 1.233~1.5 Ca, 1.312~1.5 Y, impurity element Si≤0.02, Fe≤0.003, Ni≤0.003, Cu≤0.003, surplus is Mg.
Preparation method of the present invention is that to select industrial magnesium alloy AZ91 ingot casting for use be mother alloy, master alloy ingot is preheated to 150~200 ℃, and is containing 0.03% SF 6With surplus be N 2The melt in furnace of the gas shield that is mixed; after treating that alloy all melts; temperature is risen to 700 ℃; to directly add in the melt after Ca (wrapping in advance) and the Y preheating again, and it is mixed, continue to be warming up to 720~750 ℃ with stirring tool with aluminium foil; left standstill 30 minutes; be cooled to 680 ℃ then, take surface scum off, carry out die casting.
The invention has the beneficial effects as follows: magnesium alloy room temperature tensile strength, yield strength and elongation are respectively 230~250MPa, 160~180MPa, 3~5%.Tensile strength, yield strength and elongation are respectively 180~230MPa, 90~130MPa and 8~10% under 200 ℃ of temperature.Under identical processing condition, magnesium alloy of the present invention increases than AZ91 alloy at room temperature obdurability index (tensile strength 230MPa, yield strength 140MPa, elongation 3%), obviously improves than AZ91 alloy high-temp obdurability index (the tensile strength 110MPa under 200 ℃, yield strength 60MPa, elongation 6%).This alloy is compared with mother alloy AZ91, and production cost is not higher than 10%, and alloy melt is handled simply, die cast is functional.
The magnesium alloy that uses the present invention to produce has higher high temperature strength, and is easy to casting forming.Characteristics of the present invention: 1. improve the thermotolerance of alloy, under the prerequisite of not obvious increase cost of alloy, to reach a small amount of multielement enhanced purpose by a spot of alloying element Ca of interpolation and Y in alloy.Metallic element Ca not only has fire retardation, and can the refinement alloy structure, improve the alloy high-temp performance.Rare earth element y can improve castability, raising alloy flowability and the comprehensive mechanical property of magnesium alloy, and has tangible heat treatment reinforcement effect.2. alloying element (Ca and Y) is to add in the alloy with the form of pure metal, can reduce to greatest extent like this since alloying produce impurity be mingled with.3. mother alloy AZ91 wide material sources, the melting technology maturation, highly versatile is easy to realize suitability for industrialized production.
Embodiment
Example 1
The AZ91 ingot casting is preheated to 150 ℃ in preheating oven, puts into and have 0.03% SF 6With surplus be N 2The smelting furnace of the gas shield that is mixed in and be heated to 700 ℃.Treat alloy all after the fusing, Ca (wrapping in advance with aluminium foil) and Y are preheated to 200 ℃ after, directly add in the melt and also it mixed with the stirring tool gentle agitation, continue to be warming up to 750 ℃, left standstill 30 minutes, be cooled to 680 ℃ then, take surface scum off, carry out die casting.
The casting composition (by mass percentage) as shown in the table that obtains:
Mg Al Mn Zn Si Fe Ni Cu Ca Y Other impurity
87.9 8.916 0.351 0.628 0.015 0.0024 0.0018 0.0026 1.233 0.932 Surplus
Alloy die cast is become tension specimen, and the room temperature tensile performance that records is: σ b=255.3MPa, σ s=179.3MPa, δ 5=4.0%; 200 ℃ of following tensile properties are σ b=229.5MPa, σ s=131.3MPa, δ 5=9.0%.
Example 2
The AZ91 ingot casting is preheated to 150 ℃ in preheating oven, puts into and have 0.03% SF 6With surplus be N 2The smelting furnace of the gas shield that is mixed in and be heated to 700 ℃.Treat alloy all after the fusing, Ca (wrapping in advance with aluminium foil) and Y are preheated to 200 ℃ after, directly add in the melt and also it mixed with the stirring tool gentle agitation, continue to be warming up to 750 ℃, left standstill 30 minutes, be cooled to 680 ℃ then, take surface scum off, carry out die casting.
The casting composition (by mass percentage) as shown in the table that obtains:
Mg Al Mn Zn Si Fe Ni Cu Ca Y Other impurity
88.3 8.523 0.275 0.842 0.012 0.0018 0.0021 0.0024 1.452 0.529 Surplus
Alloy die cast is become tension specimen, and the room temperature tensile performance that records is: σ b=241.5MPa, σ s=158.6MPa, δ 5=3.0%; 200 ℃ of following tensile properties are σ b=218.8MPa, σ s=117.1MPa, δ 5=7.8%.
Example 3
The AZ91 ingot casting is preheated to 150 ℃ in preheating oven, puts into and have 0.03% SF 6With surplus be N 2The smelting furnace of the gas shield that is mixed in and be heated to 700 ℃.Treat alloy all after the fusing, Ca (wrapping in advance with aluminium foil) and Y are preheated to 200 ℃ after, directly add in the melt and also it mixed with the stirring tool gentle agitation, continue to be warming up to 750 ℃, left standstill 30 minutes, be cooled to 680 ℃ then, take surface scum off, carry out die casting.
The casting composition (by mass percentage) as shown in the table that obtains:
Mg Al Mn Zn Si Fe Ni Cu Ca Y Other impurity
87.8 9.475 0.322 0.438 0.014 0.0022 0.0018 0.0024 0.569 1.312 Surplus
Alloy die cast is become tension specimen, and the room temperature tensile performance that records is: σ b=249.2MPa, σ s=176.9MPa, δ 5=4.5%; 200 ℃ of following tensile properties are σ b=224.8MPa, σ s=126.4MPa, δ 5=9.5%.

Claims (3)

1, a kind of high-strength heat-proof compression casting magnesium alloy is a mother alloy with industrial magnesium alloy AZ91 ingot casting, adds Ca and Y and makes, the chemical constitution that it is characterized in that this alloy is by mass percentage: 8.916~9.5Al, 0.4~0.9Zn, 0.1~0.5Mn, 1.233~1.5Ca, 1.312~1.5Y, impurity element Si≤0.02, Fe≤0.003, Ni≤0.003, Cu≤0.003, surplus are Mg.
2, high-strength heat-proof compression casting magnesium alloy according to claim 1, it is characterized in that this alloy room temperature tensile strength is 230~250MPa, yield strength is 160~180MPa, elongation is 3~5%, tensile strength is 180~230MPa under 200 ℃ of temperature, yield strength is 90~130MPa, and elongation is 8~10%.
3, the described high-strength heat-proof compression casting magnesium alloy preparation method of claim 1, selecting industrial magnesium alloy AZ91 ingot casting for use is mother alloy, master alloy ingot is preheated to 150~200 ℃, and 0.03%SF is being arranged 6With surplus be N 2The melt in furnace of the gas shield that is mixed; after it is characterized in that treating that mother alloy all melts, temperature is risen to 700 ℃, will directly add in the melt after Ca and the Y preheating; add-on is by mass percentage: Ca is 1.233~1.5; Y is 1.312~1.5, through mixing, continues to be warming up to 720~750 ℃; left standstill 30 minutes; be cooled to 680 ℃ then, take surface scum off, carry out die casting.
CNB2007100110196A 2007-04-19 2007-04-19 High-strength heat-proof compression casting magnesium alloy and preparation method thereof Active CN100467647C (en)

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KR101066536B1 (en) * 2010-10-05 2011-09-21 한국기계연구원 Ignition-proof magnesium alloy with excellent mechanical properties and method for manufacturing the ignition-proof magnesium alloy
KR101080164B1 (en) * 2011-01-11 2011-11-07 한국기계연구원 Ignition-proof magnesium alloy with excellent mechanical properties and method for manufacturing the ignition-proof magnesium alloy
CN102061415B (en) * 2011-01-19 2012-05-09 创金美科技(深圳)有限公司 Die cast magnesium alloy with heat cracking resistance and high fluidity
CN102424927A (en) * 2011-12-06 2012-04-25 常熟市碧溪新城特种机械厂 Magnesium-aluminum alloy and preparation method thereof
CN103290289B (en) * 2013-04-03 2015-12-23 常州华晨铸造有限公司 A kind of magnesium alloy and preparation method thereof
CN104651692A (en) * 2013-11-20 2015-05-27 沈阳工业大学 High-strength and -toughness rare earth magnesium alloy and preparation method thereof
CN104233031B (en) * 2014-10-11 2016-03-30 湖南大学 A kind of high-strength suitable weldering microalloying AZ91 magnesium alloy and preparation method
CN104480361B (en) * 2014-11-26 2017-01-11 沈阳工业大学 High-strength/toughness heat-resistant die casting magnesium alloy and preparation method thereof
CN106041015B (en) * 2016-06-29 2017-12-12 宁波胜景传动科技有限公司 A kind of reducer gear case end cap and preparation method thereof
CN106609331B (en) * 2016-12-22 2019-10-29 上海交通大学 High-ductility diecast magnesium alloy and its manufacturing process
CN107099711A (en) * 2017-04-25 2017-08-29 北京华北轻合金有限公司 Preparation method for the diecast magnesium alloy product in ruminant body
CN107604228B (en) * 2017-08-30 2019-09-27 上海交通大学 Corrosion-resistant diecast magnesium alloy of high thermal conductivity and preparation method thereof
CN108385006A (en) * 2018-03-19 2018-08-10 山西瑞格金属新材料有限公司 High-strength anti-flaming diecast magnesium alloy and preparation method thereof
US20210062306A1 (en) * 2019-08-29 2021-03-04 Mag Specialties, Inc. High strength, combustion-resistant, tube-extrudable aircraft-grade magnesium alloy
CN111172440B (en) * 2020-01-15 2021-12-10 太原科技大学 Low-cost rapid-corrosion magnesium alloy and preparation method thereof
CN111254334B (en) * 2020-03-10 2022-03-29 东莞宜安科技股份有限公司 Flame-resistant magnesium alloy and preparation method thereof
CN113528914A (en) * 2020-04-21 2021-10-22 株式会社日立制作所 High-thermal-conductivity die-casting magnesium alloy and preparation method thereof
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