High-toughness heat-resisting pressure casting Mg-Gd alloy and preparation method thereof

A hot die-casting, mg-gd technology, applied in the field of preparation of high-strength, toughness, heat-resistant die-casting Mg-Gd alloy, high-strength, heat-resistant die-casting Mg-Gd alloy, can solve the problem of inability to achieve the performance of die-casting aluminum alloy, insufficient heat resistance, etc. Problems, achieve the effect of overcoming hot cracking tendency, good high temperature stability, and improved yield strength at room temperature

Active Publication Date: 2019-05-28
JIANGSU FAVOUR AUTOMOTIVE NEW STUFF SCI TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to solve the industrial problem that the existing die-casting magnesium alloys cannot reach the performance of die-casting aluminum alloys such as A380 due to insufficient strength, toughness and heat resistance, resulting in extremely limited applications, the present invention provides high-strength, toughness and heat-resistant die-casting Mg-Gd alloys And the preparation method of pressure casting, after the alloy is pressure-cast, the tensile strength of the die-cast alloy at room temperature reaches 318MPa, the high-temperature tensile strength at 200°C reaches 218MPa, and the elongation at room temperature reaches 12.0%

Method used

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  • High-toughness heat-resisting pressure casting Mg-Gd alloy and preparation method thereof

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Embodiment 1

[0029] The weight percentage of the high-strength and tough heat-resistant die-casting Mg-Gd alloy is: according to the theoretical ratio, 4.0% Gd, 1.2% Zn, 1.2% Al, 0.3% Mn, 0.01% Ti, 0.01% B, and the balance is Mg and others. Avoid impurities. Preparation:

[0030] (1) After properly considering the burning loss, calculate the amount of raw materials required according to the above-mentioned Mg-Gd alloy composition and stoichiometric ratio; remove industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgGd25 and MgMn10 intermediate alloys The oxide layer is dried and preheated to 200°C.

[0031] (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.

[0032] (3) After the magnesium ingots are completely melted, raise the temperature to 720°C, add industrial pure zinc, Mg...

Embodiment 2

[0037] The weight percent of the high-strength and heat-resistant die-casting Mg-Gd alloy is: according to the theoretical ratio, 8.0% Gd, 4.8% Zn, 0.8% Al, 0.1% Mn, 0.08% Ti, and the balance is Mg and other inevitable impurities. Preparation:

[0038] (1) After properly considering the burning loss, calculate the amount of raw materials required according to the above-mentioned Mg-Gd alloy composition and stoichiometric ratio; remove industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgGd25 and MgMn10 intermediate alloys The oxide layer is dried and preheated to 200°C.

[0039] (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.

[0040] (3) After the magnesium ingots are completely melted, raise the temperature to 720°C,...

Embodiment 3

[0045] The weight percentage of the high-strength and heat-resistant die-casting Mg-Gd alloy is: according to the theoretical ratio, 7.0% Gd, 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:

[0046] (1) After properly considering the burning loss, calculate the amount of raw materials required according to the above-mentioned Mg-Gd alloy composition and stoichiometric ratio; remove industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgGd30 and MgMn10 intermediate alloys The oxide layer is dried and preheated to 200°C.

[0047] (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.

[0048] (3) After the magnesium ingots are completely melted, raise the temperature to 720°C, add industrial pure zinc, MgGd30 a...

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Abstract

The invention provides a high-toughness heat-resisting pressure casting Mg-Gd alloy and a preparation method thereof. The high-toughness heat-resisting pressure casting Mg-Gd alloy comprises components including, by stoichiometric ratio, 4.0%-8.0% of Gd, 1.2%-4.8% of Zn, 0.5%-1.2% of Al, 0.1%-0.3% of Mn, 0.01%-0.08% of M and the balance Mg, wherein M is one or two elements of Ti and B. The preparation method comprises the steps that firstly, materials are prepared according to Mg-Gb alloy components; secondly, industrial pure magnesium ingots are melted; thirdly, the temperature is raised to 720 DEG C, industrial pure zinc, Mg-Gd and Mg-Mn intermediate alloys are added and stirred to be completely melted; fourthly, the temperature is raised to 730 DEG C, after industrial pure aluminum ingots, Al-Ti, Al-Ti-B and Al-B intermediate alloys are sequentially added, magnesium alloy melt is obtained after refining; and fifthly, the magnesium alloy melt is cooled to a pressure casting temperature so as to be subjected to pressure casting, and a pressure casting alloy is obtained. The strength of extension of the alloy in a pressure casting state at the room temperature reaches 318 MPa, thestrength of extension of the alloy at the high temperature of 200 DEG C reaches 218 MPa, the room temperature ductility reaches 12.0%, the high-toughness heat-resisting pressure casting Mg-Gd alloy can be used without aging or solution heat treatment, and the high-end requirement of aerospace and other industries for light weight is met.

Description

technical field [0001] The invention relates to a high-strength, toughness and heat-resistant die-casting Mg-Gd alloy, which meets the high-end requirements of aerospace, automobile, telecommunications and other industries for lightweight development. The invention also relates to a preparation method of a high-strength, toughness and heat-resistant die-casting Mg-Gd alloy, which belongs to the field of industrial magnesium alloy manufacturing. 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 an...

Claims

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Application Information

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IPC IPC(8): B22D17/00C22C1/03C22C1/06C22C23/06
Inventor 刘子利叶兵刘希琴刘思雨
Owner JIANGSU FAVOUR AUTOMOTIVE NEW STUFF SCI TECH
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