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

A mg-gd-er, low-pressure casting technology, applied in the field of preparation of high-strength, toughness, heat-resistant Mg-Gd-Er alloys, and high-strength, toughness, and heat-resistant Mg-Gd-Er alloys, can solve the problem that the performance of cast aluminum alloys cannot be achieved, and the resistance to Insufficient heat and other problems, to achieve the effect of high efficiency and simple process

Active Publication Date: 2021-07-20
FENGYANG L S NET FORMING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the industrial problem that the existing casting magnesium alloy cannot reach the performance of cast aluminum alloys such as A380 due to insufficient strength, toughness and heat resistance, resulting in its application being greatly restricted, the invention provides a high strength, toughness and heat resistance suitable for low pressure casting. Mg-Gd-Y alloy and its preparation method, after the alloy is heat-treated by low-pressure casting, the room temperature tensile strength of the alloy reaches 307MPa, and the elongation rate is 17%; the high-temperature tensile strength at 200°C reaches 216MPa, and the elongation rate is 23%

Method used

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

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Effect test

Embodiment 1

[0031] The weight percent of the high-strength and tough heat-resistant Mg-Gd-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 0.6% Er, 2.4% Gd, 1.2% Zn, 1.2% Al, 0.3% Mn, 0.01% Ti, 0.01 %B, 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-Er alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgEr30 and MgMn10 master alloys were deoxidized and dried 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 ingots are completely melted, heat up ...

Embodiment 2

[0041] The weight percent of the high-strength, toughness and heat-resistant Mg-Gd-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 2.0% Er, 4.0% Gd, 3.6% Zn, 0.6% Al, 0.1% Mn, 0.08% Ti, the remaining The amount is Mg and other unavoidable 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-Er alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgEr30 and MgMn10 master alloys were deoxidized and dried and preheated to 200 °C.

[0043] (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.

[0044] (3) Afte...

Embodiment 3

[0051] The weight percent of the high-strength, toughness and heat-resistant Mg-Gd-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 3.0% Gd, 3.0% Er, 1.2% Zn, 0.6% Al, 0.2% Mn, 0.05% Ti, 0.03 %B, 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-Er alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgEr30 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.

[0054] (3) After the magnesium ingots are completely melted, hea...

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Abstract

The invention provides a high-strength, toughness, heat-resistant Mg-Gd-Er alloy suitable for low-pressure casting and a preparation method thereof. The alloy has a chemical composition in mass percent of: 3.0-7.0% RE, 1.2-4.2% 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 the composition of Mg‑Gd‑Er alloy; 2) melting industrial pure magnesium ingot; 3) heating up to 700°C, mixing industrial pure zinc with Mg‑Gd, Mg‑Er and Mg‑Mn master alloys Melting; 4) Heating up to 730°C, adding industrial pure aluminum ingots, Al-Ti, Al-Ti-B, and Al-B intermediate alloys to melt, then refining to obtain magnesium alloy melt; 5) Low-pressure casting; 6) Secondary Solution treatment, artificial aging treatment. The high-strength, toughness and heat-resistant Mg-Gd-Er alloy suitable for low-pressure casting of the present invention is subjected to low-pressure casting, secondary solution treatment and artificial aging heat treatment, and the tensile strength at room temperature reaches 305 MPa, and the elongation rate is 18%; high temperature stretching at 200 ° C The tensile strength reaches 214MPa and the elongation rate is 22%, which meets the high-end demand for lightweight development in aerospace, automotive and other industries.

Description

technical field [0001] The invention relates to a high-strength, toughness and heat-resistant Mg-Gd-Er alloy suitable for low-pressure casting, which meets the high-end requirements for lightweight development in aerospace, automobile, telecommunications and other industries. The invention also relates to a preparation method of a high-strength, toughness and heat-resistant Mg-Gd-Er 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 b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C23/04C22C1/03C22C1/06B22D18/04C22F1/06C22F1/02
Inventor 刘子利叶兵刘希琴丁文江蒋海燕
Owner FENGYANG L S NET FORMING CO LTD
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