High strength and toughness heat resistant die casting mg-gd-y alloy and preparation method thereof

A hot die casting and mg-gd technology is applied in the field of high strength, toughness and heat resistance die casting Mg-Gd-Y alloy and its pressure casting preparation. Effect

Active Publication Date: 2021-09-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to solve the industrial problem that the existing die-casting magnesium alloy cannot completely replace the die-casting aluminum alloy due to insufficient strength, toughness and heat resistance, resulting in its application being greatly limited, the present invention provides a high-strength, toughness and heat-resistant die-casting Mg-Gd-Y Alloy and its preparation method for pressure casting. After the high-strength and toughness heat-resistant die-casting Mg-Gd-Y alloy is pressure-cast, the room-temperature tensile strength of the die-cast alloy is more than 282 MPa, the elongation is more than 10%, and the high-temperature tensile strength of 200 ° C The strength is above 190MPa and the elongation is above 15.0%

Method used

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  • High strength and toughness heat resistant die casting mg-gd-y alloy and preparation method thereof

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Effect test

Embodiment 1

[0038] The percentage by weight of a high-strength and tough heat-resistant die-casting Mg-Gd-Y alloy involved in this embodiment 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.

[0039] Its preparation method is: (1) according to the above-mentioned Mg-Gd-Y alloy composition and stoichiometric ratio, calculate the consumption of required raw materials; mix industrial pure magnesium ingot, industrial pure zinc, industrial pure aluminum ingot and MgGd25, MgY30 and MgMn10 intermediate Remove the oxide layer from the alloy, dry and preheat to 200°C; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy; (2) melt the industrial pure magnesium ingot accounting for 25% of the crucible height at 680°C into After the molten pool, the protective gas argon is introduced, and the remaining magnesium ingots are added; (3) af...

Embodiment 2

[0042] The percentage by weight of a high-strength and tough heat-resistant die-casting Mg-Gd-Y alloy involved in this embodiment is: according to the theoretical ratio, 2.0% Gd, 5.0% Y, 4.2% Zn, 0.8% Al, 0.1% Mn, 0.08% Ti, the balance is Mg and other unavoidable impurities.

[0043] Its preparation method is (1) according to above-mentioned Mg-Gd-Y alloy composition and stoichiometric ratio, calculate the consumption of required raw material; Industrial pure magnesium ingot, industrial pure zinc, industrial pure aluminum ingot and MgGd30, MgY30 and MgMn10 master alloy Remove the oxide layer and dry and preheat to 180°C; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy; (2) Melt the industrial pure magnesium ingot accounting for 20% of the crucible height at 675°C After the pool, pass through the protective gas containing 0.2% volume fraction of SF 6 and CO 2 (3) After the magnesium ingots are completely melted...

Embodiment 3

[0046] The percentage by weight of a high-strength and tough heat-resistant die-casting Mg-Gd-Y alloy involved in this embodiment 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.

[0047] Its preparation method is (1) according to above-mentioned Mg-Gd-Y alloy composition and stoichiometric ratio, calculate the consumption of required raw material; Industrial pure magnesium ingot, industrial pure zinc, industrial pure aluminum ingot and MgGd30, MgY25 and MgMn10 master alloy Remove the oxide layer and dry and preheat to 200°C; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy; (2) Melt the industrial pure magnesium ingot accounting for 20% of the crucible height at 680°C After the pool, the protective gas argon is introduced, and the remaining magnesium ingots are added; (3) After the magnesium ingots are compl...

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Abstract

The invention discloses a high-strength, toughness, heat-resistant die-casting Mg-Gd-Y alloy and a preparation method thereof. The chemical components of the alloy are: 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, the balance is Mg and other inevitable impurities, wherein RE is the combined element of Gd and Y, M is Ti, and at least one element of B. After the high-strength, toughness and heat-resistant die-casting Mg-Gd-Y alloy of the present invention is pressure-cast, the room temperature tensile strength of the die-cast alloy is over 282 MPa, the elongation is over 10%, the high-temperature tensile strength at 200°C is over 190 MPa, and the elongation is over 190 MPa. It is more than 15.0%, and can be used without aging and solution heat treatment, meeting the high-end demand for lightweight development in aerospace, automotive, telecommunications and other industries.

Description

technical field [0001] The invention belongs to the field of industrial magnesium alloys and their manufacture, and in particular relates to a high-strength, toughness, heat-resistant die-casting Mg-Gd-Y alloy and a pressure-casting preparation method thereof. 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 material to replace aluminum alloy, steel and engineering plastics to achieve lightweight, among which aluminum alloy has the greatest substitution potential. [0003] Die casting is a casting method in which liquid or semi-solid me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C23/04C22C1/03C22C1/06
Inventor 叶兵刘子利张澍蒋海燕
Owner SHANGHAI JIAO TONG UNIV
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