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

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

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 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-Er alloy and its preparation method, after the alloy is heat-treated by gravity casting, the room temperature tensile strength of the alloy is 296MPa, and the elongation is 18%; the high temperature tensile strength at 200°C is 215MPa, and the elongation is 23%

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

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Embodiment 1

[0030] The weight percentage of the high-strength, toughness and heat-resistant Mg-Er alloy suitable for gravity casting is: according to the theoretical ratio, 6.0% Er, 4.2% Zn, 0.6% Al, 0.1% Mn, 0.08% Ti, the balance is Mg and others Avoid impurities.

[0031]Preparation method: (1) After proper consideration of burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Er alloy composition and stoichiometric ratio; mix industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgEr30 and MgMn10 intermediate All alloys were deoxidized and preheated to 200°C.

[0032] (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.

[0033] (3) After the magnesium ingots are completely melted, raise the temperature to 700°C,...

Embodiment 2

[0040] The weight percent of the high-strength and tough heat-resistant Mg-Er alloy suitable for gravity casting is: according to the theoretical ratio, 4.0% Er, 2.0% Zn, 0.6% Al, 0.3% Mn, 0.01% Ti, 0.01% B, and the balance is Mg and other unavoidable impurities.

[0041] Preparation method: (1) After proper consideration of burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Er alloy composition and stoichiometric ratio; mix industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgEr30 and MgMn10 intermediate All alloys were deoxidized and preheated to 200°C.

[0042] (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.

[0043] (3) After the magnesium ingots are completely melted, raise the temperature to 700°C, add industrial...

Embodiment 3

[0050] The weight percent of the high-strength, toughness and heat-resistant Mg-Er alloy suitable for gravity casting is: according to the theoretical ratio, 10.0% Er, 2.0% Zn, 1.0% Al, 0.2% Mn, 0.05% Ti, 0.03% B, and the balance is Mg and other unavoidable impurities.

[0051] Preparation method: (1) After proper consideration of burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Er alloy composition and stoichiometric ratio; mix industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgEr30 and MgMn10 intermediate All alloys were deoxidized and preheated to 200°C.

[0052] (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.

[0053] (3) After the magnesium ingots are completely melted, raise the temperature to 700°C, add indu...

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Abstract

The invention provides a high-strength, toughness, heat-resistant Mg-Er alloy suitable for gravity casting and a preparation method thereof. The alloy has a chemical composition in mass percent of: 4.0-10.0% Er, 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-Er alloy composition; (2) melting industrial pure magnesium ingot; (3) heating up to 700° C., melting industrial pure zinc and Mg-Er 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 296MPa and an elongation of 18%; a high temperature tensile strength of 215MPa and an elongation of 23% at 200°C, meeting aviation Aerospace, automobile, telecommunications and other industries have high-end demand for lightweight.

Description

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

Claims

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Application Information

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