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High-toughness heat-resistant Mg-Y alloy suitable for gravity casting and preparation method thereof

A gravity casting and alloying technology, which is applied in the field of high-strength, toughness and heat-resistant Mg-Y alloys and their preparation, can solve the problems of inability to achieve the performance of cast aluminum alloys, insufficient heat resistance, etc., and achieve overcoming thermal cracking tendency, small solidification interval, Effect of High Temperature Creep Properties Improvement

Active Publication Date: 2019-06-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • 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, resulting in greatly restricted applications, the present invention provides a high-strength magnesium alloy suitable for gravity casting. Tough and heat-resistant Mg-Y alloy and its preparation method; after gravity casting and heat treatment of the alloy, the room temperature tensile strength of the alloy is above 260MPa, and the elongation rate is above 18%; the high temperature tensile strength at 200°C is above 185MPa, and Rate 25% or more

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  • High-toughness heat-resistant Mg-Y alloy suitable for gravity casting and preparation method thereof

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Embodiment 1

[0039] The percentage by weight of a high-strength, tough, heat-resistant Mg-Y alloy suitable for gravity casting related to this embodiment is: according to the theoretical ratio, 4.0% Y, 3.0% Zn, 0.5% Al, 0.3% Mn, 0.01% Ti, 0.01% B, the balance is Mg and other unavoidable impurities.

[0040] Its preparation method is: (1) according to the above-mentioned Mg-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 Mg-Y and Mg-Mn 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) after the mag...

Embodiment 2

[0043] The percentage by weight of a high-strength, tough, heat-resistant Mg-Y alloy suitable for gravity casting related to this embodiment is: according to the theoretical ratio, 8.0% Y, 3.2% Zn, 0.8% Al, 0.1% Mn, 0.08% Ti, The balance is Mg and other unavoidable impurities.

[0044] 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 180°C; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy; (2) After melting the industrial pure magnesium ingot accounting for 20% of the crucible height into a molten pool at 685°C, Introduce a protective gas containing 0.2% volume fraction of SF 6 and CO 2 (3) After the magnesium ingots are completely melted, heat ...

Embodiment 3

[0047] The percentage by weight of a high-strength and tough heat-resistant Mg-Y alloy suitable for gravity casting related to this embodiment is: according to the theoretical ratio, 4.0% Y, 4.0% Zn, 0.9% Al, 0.2% Mn, 0.05% Ti, 0.03% B, the balance is Mg and other unavoidable impurities.

[0048] Its preparation method is (1): according to the 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 180°C; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy; (2) after melting the industrial pure magnesium ingot accounting for 22% of the crucible height into a molten pool at 675°C, Pass through the protective gas argon, and add the remaining magnesium ingots; (3) After the magnesium ingots are complete...

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Abstract

The invention discloses ahigh-toughness heat-resistant Mg-Y alloy suitable for gravity casting and a preparation method thereof. The alloy is prepared from the following chemical components in percentage by mass: 4.0-8.0% of Y, 3.0-6.0% of Zn, 0.5-1.2% of Al, 0.1-0.3% of Mn, 0.01-0.08% of M, and the balance being Mg and other inevitable impurities, specifically, M is at least one element of Ti andB. After being subjected to gravity casting, secondary solid solution treatment and artificial aging heat treatment, the high-toughness heat-resistant Mg-Y alloy has a tensile strength of 260 MPa ormore and an elongation rate of 18% or more at room temperature, and a tensile strength of 185 MPa or more and an elongation rate of 25% or more at high temperature of 200 DEG C, thereby meeting the high-end requirements for light weight development in aerospace, military, automobile and other industries.

Description

technical field [0001] The invention belongs to the field of industrial magnesium alloy and its manufacture, and in particular relates to a high-strength and tough heat-resistant Mg-Y alloy suitable for gravity casting and a 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. Cast aluminum alloy has the necessary strength, toughness and thermal stability, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C23/04C22C1/03C22C1/06C22F1/06
Inventor 叶兵刘子利蒋海燕丁文江
Owner SHANGHAI JIAO TONG UNIV
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