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High strength and toughness heat resistant die casting mg-gd alloy and preparation method thereof

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

Active Publication Date: 2022-01-11
JIANGSU FAVOUR AUTOMOTIVE NEW STUFF SCI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 strength and toughness heat resistant die 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-strength and toughness heat-resistant die-casting Mg-Gd alloy and a preparation method thereof. The composition and stoichiometric ratio of the alloy are: 4.0-8.0% Gd, 1.2-4.8% Zn, 0.5-1.2% Al, 0.1-0.3% Mn , 0.01-0.08% M, and the balance is Mg; where M is Ti, one or two elements in B. Preparation method: (1) distribute ingredients according to Mg‑Gd alloy composition; (2) melt industrial pure magnesium ingot; (3) heat up to 720°C, add industrial pure zinc, Mg‑Gd and Mg‑Mn master alloy, and stir until all Melting; (4) be warming 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) will The magnesium alloy melt is cooled to the die-casting temperature for die-casting to obtain a die-cast alloy. The room temperature tensile strength of the die-casting alloy of the invention reaches 318MPa, the high temperature tensile strength of 200 DEG C reaches 218MPa, and the room temperature elongation reaches 12.0%.

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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Patent Type & Authority Patents(China)
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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