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High-toughness heat-resistant Mg-Y-Er alloy suitable for low-pressure casting and preparation method thereof

A low-pressure casting, mg-y-er technology, applied in the field of high-strength, toughness, heat-resistant Mg-Y-Er alloy and its preparation, can solve the problems of inability to achieve the performance of cast aluminum alloy, insufficient heat resistance, etc., to eliminate LPSO, etc. Coarse precipitates, small solidification interval, and improved performance

Active Publication Date: 2019-06-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 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, which results in its application being greatly restricted, the invention provides a high strength, toughness and heat resistance suitable for low pressure casting. Mg-Y-Er alloy and its preparation method, after the alloy is heat-treated by low-pressure casting, the room temperature tensile strength of the alloy reaches 304MPa, and the elongation rate is 19%; the high-temperature tensile strength at 200°C reaches 209MPa, and the elongation rate is 24%

Method used

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

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Effect test

Embodiment 1

[0046] The weight percentage of a high-strength and heat-resistant Mg-Y-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 0.6% Er, 2.4% Y, 1.2% Zn, 1.2% Al, 0.3% Mn, 0.08% B , The balance is Mg and other unavoidable impurities.

[0047] The preparation method is:

[0048] (1) Calculate the amount of raw materials required according to the above-mentioned Mg-Y-Er alloy composition and stoichiometric ratio; remove the oxide layer from industrial pure magnesium ingot, industrial pure zinc, industrial pure aluminum ingot and MgY30, MgEr30 and MgMn10 master alloys Dry and preheat to 200℃; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy;

[0049] (2) After melting the industrial pure magnesium ingot, which accounts for 25% of the crucible height, into a molten pool at 680°C, pass the protective gas argon and add the remaining magnesium ingot;

[0050] (3) After the magnesium ingots are all me...

Embodiment 2

[0057] The weight percentage of a high-strength and heat-resistant Mg-Y-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 4.0% Er, 1.0% Y, 2.0% Zn, 0.5% Al, 0.1% Mn, 0.01% Ti , 0.01% B, the balance is Mg and other unavoidable impurities.

[0058] The preparation method is:

[0059] (1) Calculate the amount of raw materials required according to the above-mentioned Mg-Y-Er alloy composition and stoichiometric ratio; remove the oxide layer from industrial pure magnesium ingot, industrial pure zinc, industrial pure aluminum ingot and MgY30, MgEr30 and MgMn10 master alloys Dry and preheat to 200℃; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy;

[0060] (2) After melting the industrial pure magnesium ingot, which accounts for 20% of the height of the crucible, into a molten pool at 675°C, pass in protective gas containing 0.2% volume fraction of SF 6 And CO 2 Add the remaining magnesium i...

Embodiment 3

[0068] The weight percentage of a high-strength and heat-resistant Mg-Y-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 5.0% Er, 2.0% Y, 1.4% Zn, 0.7% Al, 0.2% Mn, 0.05% Ti , 0.02% B, the balance is Mg and other unavoidable impurities.

[0069] The preparation method is:

[0070] (1) Calculate the amount of raw materials required according to the above-mentioned Mg-Y-Er alloy composition and stoichiometric ratio; remove the oxide layer from industrial pure magnesium ingot, industrial pure zinc, industrial pure aluminum ingot and MgY30, MgEr30 and MgMn10 master alloys Dry and preheat to 180℃; calculate the amount of raw materials required according to the alloy composition and stoichiometric ratio;

[0071] (2) After melting the industrial pure magnesium ingots accounting for 25% of the crucible height into a molten pool at 675°C, pass the protective gas argon and add the remaining magnesium ingots;

[0072] (3) After the magnesium ingots are all mel...

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Abstract

The invention provides a high-toughness heat-resistant Mg-Y-Er alloy suitable for low-pressure casting and a preparation method thereof. The high-toughness heat-resistant Mg-Y-Er alloy suitable for low-pressure casting is prepared from the following elements in percentage by mass: 3.0-7.0% of RE, 1.2-4.2% of Zn, 0.5-1.2% of Al, 0.1-0.3% of Mn, 0.01-0.08% of M, and the balance of Mg and other inevitable impurities, wherein RE is a element composition of Y and Er, and M is at least one element of Ti and B. After being subjected to low-pressure casting, secondary solid solution treatment and manual ageing thermal treatment, the high-toughness heat-resistant Mg-Y-Er alloy suitable for low-pressure casting has room-temperature tensile strength of 304 MPa, has ductility of 19%, has high-temperature tensile strength of 209 MPa at a temperature of 200 DEG C, has ductility of 24%, and has high-end needs, on lightweight development, of industries such as aerospace, war industry and cars.

Description

Technical field [0001] The invention relates to a high-strength and heat-resistant Mg-Y-Er alloy suitable for low-pressure casting and a preparation method thereof, and belongs to the field of industrial magnesium alloys and manufacturing. Background technique [0002] As the lightest engineering metal material (magnesium has a density of 2 / 3 that of aluminum and 1 / 4 of steel), its specific strength is significantly higher than that of aluminum alloy and steel. Although its specific stiffness is equivalent to that of aluminum alloy and steel, it is far 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. It has a series of advantages in aviation, aerospace, automotive, electronics, defense and military industries. Wide application prospects. Magnesium alloy has become an ideal material to replace aluminum alloy, steel and ...

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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