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High-strength-toughness and heat-resistance Mg-Gd alloy suitable for low-pressure casting and preparation method thereof

A low-pressure casting and mg-gd technology, which is applied in the field of high-strength, toughness, and heat-resistant Mg-Gd alloys and their preparation, can solve problems such as the inability to achieve the properties of cast aluminum alloys and insufficient heat resistance, and achieve the goal of overcoming hot cracking tendencies and solidification intervals. Small size, high temperature stability and good effect

Active Publication Date: 2019-06-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the industrial problem that the existing cast magnesium alloy cannot reach the performance of cast aluminum alloys such as A380 due to insufficient strength, toughness and heat resistance, which results in its application being greatly limited, the invention provides a high-strength toughness suitable for low-pressure casting. A heat-resistant Mg-Gd alloy and a preparation method thereof. After the alloy is heat-treated by low-pressure casting, the room temperature tensile strength of the alloy is more than 280 MPa, and the elongation rate is more than 16%; rate of 16% or more

Method used

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Embodiment 1

[0041] The percentage by weight of a high-strength, tough, heat-resistant Mg-Gd alloy suitable for low-pressure casting related to the present embodiment is: according to the theoretical ratio, 4.0% Gd, 1.2% Zn, 1.2% Al, 0.3% Mn, 0.05% Ti, 0.03% B, the balance is Mg and other unavoidable impurities.

[0042]Its preparation method is: (1) according to the above-mentioned Mg-Gd 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 MgGd30 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; (2) after melting the industrial pure magnesium ingot accounting for 25% of the crucible height into a molten pool at 680°C, Pass in the protective gas argon, and add the remaining magnesium ingots; (3) After the magnesium ingots are ...

Embodiment 2

[0045] The percentage by weight of a high-strength and tough heat-resistant Mg-Gd alloy suitable for low-pressure casting related to this embodiment is: according to the theoretical ratio, 8.0% Gd, 4.8% Zn, 0.8% Al, 0.1% Mn, 0.08% Ti, The balance is Mg and other unavoidable impurities.

[0046] Its preparation method is: (1) according to the above-mentioned Mg-Gd 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 MgGd30 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 SF containing 0.2% volume fraction 6 and CO 2 (3) After the magnesium ingots are completely melted, heat up to...

Embodiment 3

[0049] The percentage by weight of a high-strength and tough heat-resistant Mg-Gd alloy suitable for low-pressure casting related to this embodiment is: according to the theoretical ratio, 7.0% Gd, 3.0% Zn, 0.5% Al, 0.2% Mn, 0.01% Ti, 0.01% B, the balance is Mg and other unavoidable impurities.

[0050] Its preparation method is: (1) according to the above-mentioned Mg-Gd 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 MgGd30 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; (2) After melting the industrial pure magnesium ingot accounting for 20% 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...

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Abstract

The invention discloses a high-strength-toughness and heat-resistance Mg-Gd alloy suitable for low-pressure casting and a preparation method thereof. The chemical composition of the alloy comprises the following in mass percentage: 4.0-8.0% of Gd, 1.2-4.8% of Zn, 0.5-1.2% of Al, 0.1-0.3% of Mn, 0.01-0.08% of M and the balance Mg and other unavoidable impurities, wherein, M is at least one elementof Ti and B. After the low-pressure casting, secondary solid-soluble treatment and artificial aging heat treatment are conducted on the high-strength-toughness and heat-resistance Mg-Gd alloy suitablefor low-pressure casting, the room temperature tensile strength is more than 280 MPa, the extension rate is more than 16%, the high-temperature stretching tensile strength at 200 DEG C is more than 190 MPa, the elongation rate is more than 16%, and the high-end demand of the lightweight development in the industries such as aerospace, military and automobiles is met.

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-Gd alloy suitable for low-pressure 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 stabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03C22C1/06B22D18/04C22F1/06
Inventor 叶兵刘子利孔向阳
Owner SHANGHAI JIAO TONG UNIV
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