High strength and toughness heat-resistant mg-gd alloy suitable for gravity casting and preparation method thereof

A gravity casting, mg-gd technology, applied in the field of preparation of high-strength, toughness and heat-resistant Mg-Gd alloys, high-strength, toughness and heat-resistant Mg-Gd alloys, can solve the problems of inability to achieve the performance of cast aluminum alloys, insufficient heat resistance, etc. Achieve high efficiency and simple process

Active Publication Date: 2021-07-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the industrial problem that the existing cast magnesium alloys cannot reach the performance of cast aluminum alloys such as A380 due to insufficient toughness and heat resistance, the application of which is greatly limited, the present invention provides high-strength, toughness and heat-resistant materials suitable for gravity casting. Mg-Gd alloy and its preparation method, after the alloy is heat-treated by gravity casting, the room temperature tensile strength of the alloy is 300MPa, and the elongation is 15%; the high temperature tensile strength at 200°C is 218MPa, and the elongation is 20%

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  • High strength and toughness heat-resistant mg-gd alloy suitable for gravity casting and preparation method thereof

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Effect test

Embodiment 1

[0031] The weight percentage of high-strength heat-resistant Mg-GD alloy suitable for gravity casting is: according to the theory, 4.0% GD, 2.0% Zn, 0.6% Al, 0.3% Mn, 0.01% Ti, 0.01% B, and margin Mg and other inevitable impurities.

[0032] Preparation method: (1) After appropriate considering burning, calculate the amount of raw materials required according to the above MG-GD alloy components and chemometrics; industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MGGD30 and MGMN10 The alloy was removed and the oxide layer was removed and the heat was intermedial to 200 ° C.

[0033] (2) After the industrial pure magnesium ingot of the height of the crucible is melted into a molten tank at 680 ° C, the gas argon is protected, and the remaining magnesium ingot is supplied.

[0034](3) After the mild moralness is melted, the temperature is heated to 700 ° C, and the industrial pure zone and MgGD 30 and MGMN10 are added 2 to 4 times, and the tem...

Embodiment 2

[0041] The weight percentage of high-strength heat-resistant Mg-GD alloy suitable for gravity casting is: according to theoretical ratio, 10.0% GD, 6.0% Zn, 1.2% Al, 0.1% Mn, 0.08% Ti, the margin is Mg and others Avoid impurities.

[0042] Preparation method: (1) After appropriate considering burning, calculate the amount of raw materials required according to the above MG-GD alloy components and chemometrics; industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MGGD30 and MGMN10 The alloy was removed and the oxide layer was removed and the heat was intermedial to 200 ° C.

[0043] (2) After the industrial pure magnesium ingot with a height of the crucible is melted into a molten tank at 680 ° C, an SF containing 0.2% by volume of the fraction 6 And Co 2 Mixed gas, add the remaining magnesium ingot.

[0044] (3) After the mild moralness is melted, the temperature is heated to 700 ° C, and the industrial pure zone and MgGD 30 and MGMN10 are ad...

Embodiment 3

[0051] The weight percentage of high-strength heat-resistant Mg-GD alloy suitable for gravity casting is: according to the theory, 7.0% GD, 3.5% Zn, 0.5% Al, 0.2% Mn, 0.05% Ti, 0.03% B, and margin Mg and other inevitable impurities.

[0052] Preparation method: (1) After appropriate considering burning, calculate the amount of raw materials required according to the above MG-GD alloy components and chemometrics; industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MGGD30 and MGMN10 The alloy was removed and the oxide layer was removed and the heat was intermedial to 200 ° C.

[0053] (2) After the industrial pure magnesium ingot of the height of the crucible is melted into a molten tank at 680 ° C, the gas argon is protected, and the remaining magnesium ingot is supplied.

[0054] (3) After the mild moralness is melted, the temperature is heated to 700 ° C, and the industrial pure zone and MgGD 30 and MGMN10 are added 2 to 4 times, and the te...

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Abstract

The invention provides a high-strength, toughness, heat-resistant Mg-Gd alloy suitable for gravity casting and a preparation method thereof. The alloy has a chemical composition in mass percent of: 4.0-10.0% Gd, 2.0-6.0% 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) batching according to Mg-Gd alloy composition; (2) melting industrial pure magnesium ingot; (3) heating up to 700° C., melting industrial pure zinc and Mg-Gd and Mg-Mn master alloy; ( 4) Heat up to 730°C, add industrial pure aluminum ingots, Al-Ti, Al-Ti-B, and Al-B master alloys to melt, and then refine to obtain a magnesium alloy melt; (5) Gravity casting; (6) Secondary Solution, artificial aging treatment. After gravity casting, secondary solution treatment and artificial aging heat treatment, the alloy of the present invention has a room temperature tensile strength of 300MPa and an elongation of 15%; a high temperature tensile strength of 218MPa and an elongation of 20% at 200°C, meeting the aviation Aerospace, automobile, telecommunications and other industries have high-end demands for lightweight development.

Description

Technical field [0001] The present invention relates to a high-strength heat-resistant MG-GD alloy suitable for gravity casting, which meets high-end demand for lightweight development in aerospace, automotive, telecommunications and other industries. The invention also relates to the preparation method of high-strength heat-resistant MG-GD alloys suitable for gravity cast, belonging to the field of magnesium alloy and manufacturing in industrial. Background technique [0002] The magnesium alloy is the lightest engineering metal material (the density of magnesium is 2 / 3 of aluminum, 1 / 4 of steel), which is significantly higher than the aluminum alloy and steel, although the stiffness is comparable to the aluminum alloy and steel, but far away More than the engineering plastics, there is a series of advantages such as good castability, good cutting, good thermal conductivity, damping, and electromagnetic shielding ability, and easy-to-recycling, in the fields of aviation, aerospa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06B22D21/04C22C1/03C22F1/06
Inventor 刘子利叶兵刘希琴刘思雨
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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