High-toughness heat-resistant Mg-Gd alloy suitable for gravity casting and preparation method thereof

A gravity casting, mg-gd technology, applied in the preparation of high-strength, toughness and heat-resistant Mg-Gd alloys, in the field of high-strength, toughness and heat-resistant Mg-Gd alloys, can solve the problems of insufficient heat resistance and the inability to achieve the performance of cast aluminum alloys, etc. Achieve high temperature stability, enhance room temperature mechanical properties and high temperature properties, and avoid performance degradation

Active Publication Date: 2019-06-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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-toughness heat-resistant Mg-Gd alloy suitable for gravity casting and preparation method thereof

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Embodiment 1

[0031] The weight percent of the high-strength, toughness and heat-resistant Mg-Gd alloy suitable for gravity casting is: according to the theoretical ratio, 4.0% Gd, 2.0% Zn, 0.6% Al, 0.3% Mn, 0.01% Ti, 0.01% B, and the balance is Mg and other unavoidable impurities.

[0032] Preparation method: (1) After proper consideration of burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd alloy composition and stoichiometric ratio; mix industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgGd30 and MgMn10 intermediate All alloys were deoxidized and preheated to 200°C.

[0033] (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.

[0034](3) After the magnesium ingot is completely melted, raise the temperature to 700°C, add industr...

Embodiment 2

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

[0042] Preparation method: (1) After proper consideration of burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd alloy composition and stoichiometric ratio; mix industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgGd30 and MgMn10 intermediate All alloys were deoxidized and preheated to 200°C.

[0043] (2) After melting the commercially pure magnesium ingots accounting for 25% of the height of the crucible into a molten pool at 680 ° C, pass through SF containing 0.2% volume fraction 6 and CO 2 The mixed gas, add the remaining magnesium ingots.

[0044] (3) After the magnesium ingot is completely melted, raise the temperature to 700°C,...

Embodiment 3

[0051] The weight percent of the high-strength, toughness and heat-resistant Mg-Gd alloy suitable for gravity casting is: according to the theoretical ratio, 7.0% Gd, 3.5% Zn, 0.5% Al, 0.2% Mn, 0.05% Ti, 0.03% B, and the balance is Mg and other unavoidable impurities.

[0052] Preparation method: (1) After proper consideration of burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd alloy composition and stoichiometric ratio; mix industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgGd30 and MgMn10 intermediate All alloys were deoxidized and preheated to 200°C.

[0053] (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.

[0054] (3) After the magnesium ingot is completely melted, raise the temperature to 700°C, add indust...

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Abstract

The invention provides a high-toughness heat-resistant Mg-Gd alloy suitable for gravity casting and a preparation method thereof. The alloy comprises the following chemical components of, in percentage, 4.0-10.0% of Gd, 2.0-6.0% 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 the M is one or two elements of Ti and B; the preparation method comprises the following steps that (1) burdening is performed according to a Mg-Gd alloy component; (2) an industrial pure magnesium ingot is melted; (3) heating is performed to 700 DEG C, and industrial pure zinc, an Mg-Gd and Mg-Mn intermediate alloy are melted; (4) heating is performed to 730 DEG C, after an industrial pure aluminum ingot, Al-Ti, Al-Ti-B and Al-B intermediate alloys added are all melted, refining isperformed to obtain a magnesium alloy melt; (5) gravity casting is performed; and (6) secondary solid solution and artificial aging treatment are performed. According to the high-toughness heat-resistant Mg-Gd alloy and the preparation method, after the alloy is subjected to the gravity casting, the secondary solid solution treatment and the artificial aging heat treatment, the tensile strength at room temperature is 300 MPa, the elongation percentage is 15%, the high-temperature tensile strength at 200 DEG C is 218 MPa, the elongation percentage is 20%, and the high-end requirement for lightweight development in the industries of aerospace, automobiles, telecommunication and the like is met.

Description

technical field [0001] The invention relates to a high-strength, toughness, and heat-resistant Mg-Gd alloy suitable for gravity casting, 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 Mg-Gd alloy suitable for gravity casting, 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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