High-strength and tough heat-resistant die-casting mg-gd-er alloy and its preparation method

A mg-gd-er, hot die-casting technology, applied in the field of industrial magnesium alloy and manufacturing, can solve the problems of incomplete replacement 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

[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-Er Alloy and its preparation method for pressure casting. After the high-strength and toughness heat-resistant die-casting Mg-Gd-Er alloy is pressure-cast, the room-temperature tensile strength of the die-cast alloy reaches 312MPa, the high-temperature tensile strength at 200°C reaches 210MPa, and the room-temperature elongation reaches 13.0%

Method used

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  • High-strength and tough heat-resistant die-casting mg-gd-er alloy and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The weight percent of a high-strength and tough heat-resistant die-casting Mg-Gd-Er alloy is: according to the theoretical ratio, 0.6% Er, 2.4% Gd, 1.2% Zn, 1.2% Al, 0.3% Mn, 0.08% Ti, 0.01% B , the balance being Mg and other unavoidable impurities.

[0040] Its preparation method is:

[0041] (1) Calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Er alloy composition and stoichiometric ratio; remove the oxide layer from industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgGd25, MgEr25 and MgMn10 intermediate alloys And dry and preheat to 200°C; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy;

[0042] (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;

[004...

Embodiment 2

[0048] The weight percentage of a kind of high-strength and toughness heat-resistant die-casting Mg-Gd-Er alloy is: according to the theoretical ratio, 2.0% Er, 4.0% Gd, 3.6% Zn, 0.6% Al, 0.1% Mn, 0.06% Ti, the balance is Mg and other unavoidable impurities.

[0049] Its preparation method is:

[0050] (1) Calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Er alloy composition and stoichiometric ratio; remove the oxide layer from industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgGd25, MgEr30 and MgMn10 intermediate alloys And dry and preheat to 200°C; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy;

[0051] (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 g...

Embodiment 3

[0057] The weight percent of a high-strength and tough heat-resistant die-casting Mg-Gd-Er alloy is: according to the theoretical ratio, 3.0% Gd, 3.0% Er, 1.2% Zn, 0.6% Al, 0.2% Mn, 0.01% Ti, 0.03% B , the balance being Mg and other unavoidable impurities.

[0058] Its preparation method is:

[0059] (1) Calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Er alloy composition and stoichiometric ratio; remove the oxide layer from industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots, and MgGd30, MgEr30 and MgMn10 intermediate alloys And dry and preheat to 200°C; calculate the amount of raw materials required according to the composition and stoichiometric ratio of the alloy;

[0060] (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;

[006...

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Abstract

The invention provides a high-strength and tough heat-resistant die-casting Mg-Gd-Er alloy and a preparation method thereof. The alloy includes the following elements in mass percentage: 3.0-8.5% RE, 1.2-4.2% Zn, 0.5-1.2% Al, 0.1-0.3% Mn, 0.01-0.08% M, and the balance is Mg and other unavoidable impurities; wherein, RE is Gd and Er, and M is at least one element among Ti and B. After the high-strength, toughness and heat-resistant die-casting Mg-Gd-Er alloy of the present invention is die-cast, the room-temperature tensile strength of the die-cast alloy reaches 312MPa, the high-temperature tensile strength at 200°C reaches 210MPa, and the room-temperature elongation reaches 13.0%. Solution heat treatment can be used to meet the high-end demand for lightweight development in aerospace, automotive, telecommunications and other industries.

Description

technical field [0001] The invention relates to a high-strength and toughness heat-resistant die-casting Mg-Gd-Er 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-cas...

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 叶兵刘子利蒋海燕
Owner SHANGHAI JIAOTONG UNIV
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