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High-strength and tough heat-resistant die-casting mg-er alloy and preparation method thereof

A hot die-casting and mg-er technology, which is applied in the preparation of high-strength, toughness and heat-resistant die-casting Mg-Er alloys, and in the field of high-strength, toughness and heat-resistant die-casting Mg-Er alloys, can solve the problems of inability to achieve the performance of die-casting aluminum alloys, insufficient heat resistance, etc. problem, to achieve high efficiency and simple process

Active Publication Date: 2021-09-17
FENGYANG L S NET FORMING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the industrial problem that the existing die-casting magnesium alloy cannot reach the performance of die-casting aluminum alloys such as A380 due to insufficient strength, toughness and heat resistance, resulting in its application being greatly limited, the present invention provides a high-strength, toughness and heat-resistant die-casting Mg-Er alloy The preparation method of the pressure casting method thereof, after the alloy is pressure cast, the room temperature tensile strength of the die cast alloy reaches 302MPa, the high temperature tensile strength of 200°C reaches 205MPa, and the room temperature elongation reaches 15.0%

Method used

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  • High-strength and tough heat-resistant die-casting mg-er alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The weight percentage of the high-strength and heat-resistant die-casting Mg-Er alloy is: according to the theoretical ratio, 4.0% Er, 1.2% Zn, 1.2% Al, 0.3% Mn, 0.01% Ti, 0.01% B, the balance is Mg and others Avoid impurities. Preparation:

[0028] (1) After properly considering the burning loss, calculate the amount of raw materials required according to the above-mentioned Mg-Er alloy composition and stoichiometric ratio; remove industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgEr25 and MgMn10 intermediate alloys The oxide layer is dried and preheated to 200°C.

[0029] (2) After melting the commercially pure magnesium ingots accounting for 25% of the height of the crucible into a molten pool at 680° C., the protective gas argon is introduced, and the remaining magnesium ingots are added.

[0030] (3) After the magnesium ingots are completely melted, raise the temperature to 720°C, add industrial pure zinc, MgEr25 and Mg...

Embodiment 2

[0035] The weight percent of the high-strength and heat-resistant die-casting Mg-Er alloy is: according to the theoretical ratio, 8.5% Er, 5.1% Zn, 0.85% Al, 0.1% Mn, 0.08% Ti, and the balance is Mg and other inevitable impurities. Preparation:

[0036] (1) After properly considering the burning loss, calculate the amount of raw materials required according to the above-mentioned Mg-Er alloy composition and stoichiometric ratio; remove industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgEr30 and MgMn10 intermediate alloys The oxide layer is dried and preheated to 200°C.

[0037] (2) After melting the commercially pure magnesium ingot accounting for 25% of the height of the crucible into a molten pool at 680 ° C, pass through a protective gas containing 0.2% volume fraction of SF 6 and CO 2 The mixed gas, add the remaining magnesium ingots.

[0038] (3) After the magnesium ingots are completely melted, raise the temperature to 720°C...

Embodiment 3

[0043] The weight percentage of the high-strength and heat-resistant die-casting Mg-Er alloy is: according to the theoretical ratio, 6.0% Er, 3.0% Zn, 0.5% Al, 0.2% Mn, 0.05% Ti, 0.03% B, and the balance is Mg and others Avoid impurities. Preparation:

[0044] (1) After properly considering the burning loss, calculate the amount of raw materials required according to the above-mentioned Mg-Er alloy composition and stoichiometric ratio; remove industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgEr30 and MgMn10 intermediate alloys Oxide layer and dry preheated to 200°C

[0045] (2) After melting the commercially pure magnesium ingots accounting for 25% of the height of the crucible into a molten pool at 680° C., the protective gas argon is introduced, and the remaining magnesium ingots are added.

[0046] (3) After the magnesium ingots are completely melted, raise the temperature to 720°C, add industrial pure zinc, MgEr30 and MgMn10 i...

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Abstract

The invention provides a high-strength and toughness heat-resistant die-casting Mg-Er alloy and a preparation method thereof, the alloy composition and stoichiometric ratio: 4.0-8.5% Er, 1.2-5.1% Zn, 0.5-1.2% Al, 0.1-0.3% Mn, 0.01~0.08% M, the balance is Mg; where M is Ti, one or two elements in B. Preparation method: 1) Dosing according to the composition of Mg-Er alloy; 2) Melting industrial pure magnesium ingot; 3) Raising the temperature to 720°C, adding industrial pure zinc, Mg-Er and Mg-Mn master alloy, and stirring until completely melted ; 4) be heated up to 730 ℃, after the industrial pure aluminum ingot, Al-Ti, Al-Ti-B, Al-B master alloy added successively are all melted, obtain magnesium alloy melt after refining; (5) magnesium alloy The melt is cooled to the die-casting temperature for die-casting to obtain a die-casting alloy. After die-casting, the alloy of the present invention has a tensile strength of 302 MPa at room temperature in a die-cast state, 205 MPa at a high temperature of 200°C, and a room temperature elongation of 15.0%, and can be used without aging or solution heat treatment, meeting the needs of aerospace, etc. The industry's high-end demand for lightweight.

Description

technical field [0001] The invention relates to a high-strength, toughness and heat-resistant die-casting Mg-Er alloy, which meets the high-end demand for lightweight development in aerospace, automobile, telecommunications and other industries. The invention also relates to a preparation method of a high-strength and tough heat-resistant die-casting Mg-Er alloy, which belongs to the field of industrial magnesium alloys and their manufacture. Background technique [0002] As the lightest engineering metal material (the density of magnesium is 2 / 3 of aluminum and 1 / 4 of steel), its specific strength is obviously higher than that of aluminum alloy and steel. Higher than engineering plastics, it also has a series of advantages such as good castability, good machinability, good thermal conductivity, damping, strong electromagnetic shielding ability and easy recycling. Wide application prospects. Magnesium alloy has become an ideal material to replace aluminum alloy, steel and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C23/04C22C1/03C22C1/06
Inventor 叶兵刘子利刘希琴丁文江蒋海燕
Owner FENGYANG L S NET FORMING CO LTD
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