High-strength and tough heat-resistant mg-gd-y alloy suitable for low-pressure casting and its preparation method

A low-pressure casting, mg-gd technology, applied in the field of preparation of high-strength, toughness, heat-resistant Mg-Gd-Y alloy, high-strength, toughness, heat-resistant Mg-Gd-Y alloy, can solve the problem of insufficient heat resistance and the inability to achieve cast aluminum alloys Performance and other issues, achieve good high temperature stability, enhance room temperature mechanical properties and high temperature properties, and improve high temperature creep properties

Active Publication Date: 2021-01-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Claims
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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 strength, toughness and heat resistance, resulting in greatly limited application, the invention provides high-strength, toughness and heat-resistant Mg suitable for low-pressure casting -Gd-Y alloy and its preparation method, the alloy has a room temperature tensile strength of 307MPa and an elongation of 17% after low pressure casting heat treatment; a high temperature tensile strength of 216MPa and an elongation of 23% at 200°C

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  • High-strength and tough heat-resistant mg-gd-y alloy suitable for low-pressure casting and its preparation method

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Embodiment 1

[0032] The weight percent of the high-strength and tough heat-resistant Mg-Gd-Y alloy suitable for low-pressure casting is: according to the theoretical ratio, 0.6% Gd, 2.4% Y, 1.2% Zn, 1.2% Al, 0.3% Mn, 0.01% Ti, 0.01 %B, the balance is Mg and other unavoidable impurities.

[0033] Preparation method: (1) After properly considering burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Y alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgY30 and MgMn10 master alloys were deoxidized and dried and preheated to 200 °C.

[0034] (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.

[0035] (3) After the magnesium ingots are completely melted, heat up to 700°...

Embodiment 2

[0042] The weight percent of the high-strength, toughness and heat-resistant Mg-Gd-Y alloy suitable for low-pressure casting is: according to the theoretical ratio, 2.0% Gd, 5.0% Y, 4.2% Zn, 0.8% Al, 0.1% Mn, 0.08% Ti, and the remaining The amount is Mg and other unavoidable impurities.

[0043] Preparation method: (1) After properly considering burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Y alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgY30 and MgMn10 master alloys were deoxidized and dried and preheated to 200 °C.

[0044] (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 (3) After the magnesium ingots are completely melted, heat up to 700°C, ...

Embodiment 3

[0051] The weight percent of the high-strength and tough heat-resistant Mg-Gd-Y alloy suitable for low-pressure casting is: according to the theoretical ratio, 3.0% Gd, 3.0% Y, 3.0% Zn, 0.9% Al, 0.2% Mn, 0.05% Ti, 0.03 %B, the balance is Mg and other unavoidable impurities.

[0052] Preparation method: (1) After properly considering burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Y alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgY30 and MgMn10 master alloys were deoxidized and dried 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; (3) After the magnesium ingots are completely melted, the temperature is raised...

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Abstract

The invention provides an Mg-Gd-Y alloy with high strength and ductility and heat resistance and suitable for low pressure casting and a preparation method thereof. The Mg-Gd-Y alloy is prepared fromthe chemical components in percentage by mass: 3.0% to 7.0% of RE, 1.2% to 4.2% of Zn, 0.5% to 1.2% of Al, 0.1% to 0.3% of Mn, 0.01% to 0.08% of M, and the balance of Mg; and M is one or two elementsin Ti and B. The prepared method includes the steps that (1) a material is prepared according to Mg-Gd-Y alloy components; (2) an industrial pure magnesium ingot is melted; (3) a temperature rises to700 DEG C, and industrial pure zinc, and Mg-Gd, Mg-Y and Mg-Mn intermediate alloys are melted; (4) the temperature rises to 730 DEG C, an industrial pure aluminium ingot, and Al-Ti, Al-Ti-B, and Al-Bintermediate alloys are added and all melted, and then magnesium alloy fondant is obtained though refining; (5) low pressure casting is conducted; and (6) second-level solution treatment and artificial aging treatment are conducted. After the Mg-Gd-Y alloy with the high strength and ductility and heat resistance and suitable for low pressure casting is subjected to low pressure casting, second-level solution treatment and artificial aging treatment, indoor temperature extension strength reaches 307 Mpa, and ductility is 17%; and high temperature tensile extension strength at 200 DEG C reaches216 Mpa, ductility is 23%, and the high-end needs of industries of aerospace, automobiles and the like for light weight development are met.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C23/04C22C1/06C22C1/03C22F1/06B22D18/04
Inventor 刘子利叶兵刘希琴刘思雨
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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