High-strength high-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 field of high-strength, toughness and heat-resistant Mg-Er alloys, and high-strength, toughness and heat-resistant Mg-Er alloys, can solve the problems of inability to achieve the performance of cast aluminum alloys and insufficient heat resistance, and achieve The effect of overcoming hot cracking tendency, good high temperature stability, and improved yield strength at room temperature

Active Publication Date: 2019-06-28
FENGYANG L S NET FORMING CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 high-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 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, and the balance is Mg and other non-standard alloys. Impurities to avoid.

[0031] Preparation method: (1) After proper consideration of the burning loss, calculate the amount of raw materials required according to the above-mentioned Mg-Er alloy composition and stoichiometric ratio; mix industrial pure magnesium ingot, industrial pure zinc, industrial pure aluminum ingot and MgEr30 and MgMn10 between The alloys are all removed from the oxide layer and dried and preheated to 200°C.

[0032] (2) After melting the industrial pure magnesium ingot accounting for 25% of the crucible height into a molten pool at 680°C, pass in SF containing 0.2% volume fraction 6 And CO 2 Add the remaining magnesium ingot.

[0033] (3) After all the magnesium ingots are melted, the temperature is raised to 700°C,...

Embodiment 2

[0040] The weight percentage of the high-strength and 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 the burning loss, calculate the amount of raw materials required according to the above-mentioned Mg-Er alloy composition and stoichiometric ratio; mix industrial pure magnesium ingot, industrial pure zinc, industrial pure aluminum ingot and MgEr30 and MgMn10 between The alloys are all removed from the oxide layer and dried and preheated to 200°C.

[0042] (2) After melting the industrial pure magnesium ingot accounting for 25% of the crucible height into a molten pool at 680°C, the protective gas argon is introduced, and the remaining magnesium ingot is added.

[0043] (3) After all the magnesium ingots are melted, the temperature is raised to 700°C, and industria...

Embodiment 3

[0050] The weight percentage of the high-strength 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 the burning loss, calculate the amount of raw materials required according to the above-mentioned Mg-Er alloy composition and stoichiometric ratio; mix industrial pure magnesium ingot, industrial pure zinc, industrial pure aluminum ingot and MgEr30 and MgMn10 between The alloys are all removed from the oxide layer and dried and preheated to 200°C.

[0052] (2) After melting the industrial pure magnesium ingot accounting for 25% of the crucible height into a molten pool at 680°C, the protective gas argon is introduced, and the remaining magnesium ingot is added.

[0053] (3) After all the magnesium ingots are melted, the temperature is raised to 700°C, and industri...

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Abstract

The invention provides a high-strength high-toughness heat-resistant Mg-Er alloy suitable for gravity casting and a preparation method thereof. The alloy is prepared from the following chemical components in percentage by mass: 4.0-10.0% of Er, 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, specifically, M is one or two elements of Ti and B. The preparation method comprises the following steps: (1) carrying out burdening according to the Mg-Er alloy components; (2) melting an industrial pure magnesium ingot; (3) rising the temperature to 700 DEG C to meltindustrial pure zinc, the Mg-Er intermediate alloy and a Mg-Mn intermediate alloy; (4) rising the temperature to 730 DEG C, and adding and melting an industrial pure aluminum ingot, an Al-Ti intermediate alloy, an Al-Ti-B intermediate alloy, and an Al-B intermediate alloy to obtain a magnesium alloy melt; (5) carrying out gravity casting; and (6) carrying out secondary solid solution and artificial aging treatment. After gravity casting, secondary solid solution treatment and artificial aging heat treatment, the alloy provided by the invention has tensile strength of 296 MPa and elongation rate of 18% at room temperature; while at high temperature of 200 DEG C, the tensile strength is 215 MPa and the elongation is 23%; and the requirements of aerospace, automobile, telecommunication and other industries for light weight are met.

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 demand for lightweight development in aerospace, automotive, telecommunications and other industries. The invention also relates to a method for preparing a high-strength and heat-resistant Mg-Er alloy suitable for gravity casting, which belongs to the field of industrial magnesium alloy and its manufacturing. Background technique [0002] Magnesium alloy is the lightest engineering metal material (the density of magnesium is 2 / 3 of aluminum and 1 / 4 of steel). Its specific strength is significantly higher than that of aluminum alloy and steel. Although its specific stiffness is equivalent to that of aluminum alloy and steel, it is far Higher than engineering plastics, it also has a series of advantages such as good castability, good machinability, good thermal conductivity, damping, strong electromagnetic shielding abilit...

Claims

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Application Information

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Patent Type & Authority Applications(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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