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

A technology of hot die-casting and toughness, which is applied in the field of high-strength, toughness and heat-resistant die-casting Mg-Y alloys and its preparation, which can solve the problems of inability to achieve the performance of die-casting aluminum alloys and insufficient heat resistance, and achieve the effect of high efficiency and simple process

Active Publication Date: 2021-08-17
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the industrial problem that the existing die-casting magnesium alloy cannot reach the performance of die-casting aluminum alloys such as A380 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 alloy. - Y alloy and its preparation method for pressure casting. After the alloy is pressure cast, the room temperature tensile strength of the die-cast alloy reaches 315MPa, the high temperature tensile strength of 200°C reaches 210MPa, and the room temperature elongation reaches 12.0%.

Method used

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

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Effect test

Embodiment 1

[0037] The weight percent of a kind of high-strength and toughness heat-resistant die-casting Mg-Y alloy is: by theoretical ratio, 2.5% Y, 1.0% Zn, 0.5% Al, 0.3% Mn, 0.01% Ti, 0.01% B, the balance is Mg and other unavoidable impurities.

[0038] Its preparation method is:

[0039] (1) According to the above-mentioned Mg-Y alloy composition and stoichiometric ratio, calculate the amount of required raw materials; industrially pure magnesium ingots, industrially pure zinc, industrially pure aluminum ingots, and MgY25 and MgMn10 master alloys are all removed from the oxide layer and pre-dried Heat to 200°C; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy;

[0040] (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;

[0041] (3) After the magnesi...

Embodiment 2

[0046] The weight percent of a high-strength and tough heat-resistant die-casting Mg-Y alloy is: according to the theoretical ratio, 5.0% Y, 4.0% Zn, 1.2% Al, 0.1% Mn, 0.08% Ti, and the balance is Mg and other unavoidable Impurities.

[0047] Its preparation method is:

[0048] (1) According to the above-mentioned Mg-Y alloy composition and stoichiometric ratio, calculate the amount of required raw materials; remove the oxide layer and pre-dry the industrial pure magnesium ingot, industrial pure zinc, industrial pure aluminum ingot and MgY30 and MgMn10 master alloy Heat to 200°C; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy;

[0049] (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 ingot;

[0050] (3...

Embodiment 3

[0055] The weight percentage of a kind of high-strength and toughness heat-resistant die-casting Mg-Y alloy is: by theoretical ratio, 3.0%Y, 2.0%Zn, 1.0%Al, 0.2%Mn, 0.05%Ti, 0.03%B, the balance is Mg and other unavoidable impurities.

[0056] Its preparation method is: (1) according to above-mentioned Mg-Y alloy composition and stoichiometric ratio, calculate the consumption of required raw material; Deoxidize industrial pure magnesium ingot, industrial pure zinc, industrial pure aluminum ingot and MgY30 and MgMn10 master alloy 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;

[0057] (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;

[0058] (3) After the magnesium ingots are completely melted, raise the ...

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Abstract

The invention provides a high-strength and toughness heat-resistant die-casting Mg-Y alloy and a preparation method thereof. The alloy includes the following elements in mass percentage: 2.5-5.0% Y, 1.0-4.0% Zn, 0.5-1.2% Al, 0.1-0.3% Mn, 0.01-0.08% M, the balance being Mg and other unavoidable impurities; wherein M is Ti and at least one element in B. After the high-strength, toughness and heat-resistant die-casting Mg-Y alloy of the present invention is pressure-cast, the room-temperature tensile strength of the die-cast alloy reaches 315MPa, the high-temperature tensile strength at 200°C reaches 210MPa, and the room-temperature elongation reaches 12.0%, and no aging or solid solution is required. It can be used after heat treatment to meet the high-end needs of aerospace, automotive, telecommunications and other industries for lightweight development.

Description

technical field [0001] The invention relates to a high-strength and toughness heat-resistant die-casting Mg-Y alloy and a preparation method thereof, belonging 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 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 metal is filled into the die-casting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22C1/06
Inventor 叶兵刘子利丁文江蒋海燕
Owner SHANGHAI JIAOTONG UNIV
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