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

A low-pressure casting and mg-er technology, which is applied in the field of preparation 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, etc. Achieve high efficiency and simple process

Active Publication Date: 2021-07-09
JIANGSU FAVOUR AUTOMOTIVE NEW STUFF SCI TECH +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 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-Er alloy and its preparation method, after the low-pressure casting heat treatment of the alloy, the room temperature tensile strength of the alloy reaches 299MPa, and the elongation rate is 19%; the high temperature tensile strength at 200°C reaches 210MPa, and the elongation rate is 24%

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

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Embodiment 1

[0030] The weight percent of the high-strength, toughness and heat-resistant Mg-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 4.0% Er, 1.2% Zn, 1.2% Al, 0.3% Mn, 0.01% Ti, 0.01% B, and the balance is Mg and other unavoidable impurities.

[0031] Its preparation method: (1) After properly considering the burning loss, calculate the consumption of required raw materials according to the above-mentioned Mg-Er alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, MgEr30 and MgMn10 The oxide layer of the master alloy is removed and dried and preheated to 200°C; the amount of raw materials required is calculated according to the composition and stoichiometric ratio of the alloy.

[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., the protective gas argon is introduced,...

Embodiment 2

[0040] The weight percentage of the high-strength, toughness and heat-resistant Mg-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 8.5% Er, 5.1% Zn, 0.85% Al, 0.1% Mn, 0.08% Ti, and the balance is Mg and others Avoid 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, pass through SF containing 0.2% volume fraction 6 and CO 2 The mixed gas, add the remaining magnesium ingots.

[0043] (3) After the magnesium ingots are completely melted, raise the temperatur...

Embodiment 3

[0050] The weight percent of the high-strength, toughness and heat-resistant Mg-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 6.0% Er, 3.0% Zn, 0.5% 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 ...

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Abstract

The invention provides a high-strength, toughness, heat-resistant Mg-Er alloy suitable for low-pressure casting and a preparation method thereof. The alloy has chemical components in mass percentages of: 4.0-8.5% Er, 1.2-5.1% 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) Dosing according to the composition of Mg-Er alloy; 2) Melting industrial pure magnesium ingot; 3) Raising the temperature to 700°C, adding industrial pure zinc, Mg-Er and Mg-Mn master alloy, and stirring until completely melted ; 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 solid Solvent treatment, artificial aging treatment. After low-pressure casting, secondary solution treatment and artificial aging heat treatment, the alloy of the present invention has a room temperature tensile strength of 299MPa and an elongation of 19%; a high-temperature tensile strength of 210MPa and an elongation of 24% at 200°C, meeting aerospace requirements. 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 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-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 become...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06B22D18/04
Inventor 刘希琴叶兵刘思雨刘子利
Owner JIANGSU FAVOUR AUTOMOTIVE NEW STUFF SCI TECH
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