High-strength, high-ductility and heat-resisting Mg-Gd-Er alloy applicable to low-pressure casting and preparation method for same

A mg-gd-er, low-pressure casting technology, applied in the preparation of high-strength, toughness, heat-resistant Mg-Gd-Er alloys, and the field of high-strength, toughness, and heat-resistant Mg-Gd-Er alloys, can solve the problem that the performance of cast aluminum alloys cannot be achieved, and the resistance to Insufficient thermal properties, etc., to achieve the effects of enhancing room temperature mechanical properties and high temperature properties, good high temperature stability, and improved high temperature creep properties

Active Publication Date: 2019-06-14
FENGYANG L S NET FORMING CO LTD +1
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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 casting magnesium alloy cannot reach the performance of cast aluminum alloys such as A380 due to insufficient strength, toughness and heat resistance, resulting in its application being greatly restricted, the invention provides a high strength, toughness and heat resistance suitable for low pressure casting. Mg-Gd-Y alloy and its preparation method, after the alloy is heat-treated by low-pressure casting, the room temperature tensile strength of the alloy reaches 307MPa, and the elongation rate is 17%; the high-temperature tensile strength at 200°C reaches 216MPa, and the elongation rate is 23%

Method used

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  • High-strength, high-ductility and heat-resisting Mg-Gd-Er alloy applicable to low-pressure casting and preparation method for same

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Effect test

Embodiment 1

[0031] The weight percent of the high-strength and tough heat-resistant Mg-Gd-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 0.6% Er, 2.4% Gd, 1.2% Zn, 1.2% Al, 0.3% Mn, 0.01% Ti, 0.01 %B, the balance is Mg and other unavoidable impurities.

[0032] Preparation method: (1) After proper consideration of burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Er alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgEr30 and MgMn10 master alloys were deoxidized and dried and preheated to 200 °C.

[0033] (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.

[0034] (3) After the magnesium ingots are completely melted, heat up ...

Embodiment 2

[0041] The weight percent of the high-strength, toughness and heat-resistant Mg-Gd-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 2.0% Er, 4.0% Gd, 3.6% Zn, 0.6% Al, 0.1% Mn, 0.08% Ti, the remaining The amount is Mg and other unavoidable impurities.

[0042] Preparation method: (1) After proper consideration of burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Er alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgEr30 and MgMn10 master alloys were deoxidized and dried and preheated to 200 °C.

[0043] (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 ingots.

[0044] (3) Afte...

Embodiment 3

[0051] The weight percent of the high-strength, toughness and heat-resistant Mg-Gd-Er alloy suitable for low-pressure casting is: according to the theoretical ratio, 3.0% Gd, 3.0% Er, 1.2% Zn, 0.6% Al, 0.2% Mn, 0.05% Ti, 0.03 %B, the balance is Mg and other unavoidable impurities.

[0052] Preparation method: (1) After proper consideration of burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Er alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgEr30 and MgMn10 master alloys were deoxidized and dried and preheated to 200 °C.

[0053] (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.

[0054] (3) After the magnesium ingots are completely melted, hea...

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Abstract

The invention provides high-strength, high-ductility and heat-resisting Mg-Gd-Er alloy applicable to low-pressure casting and a preparation method for the same. The alloy is constituted of chemical ingredients including, 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 as well as Mg, wherein M comprises one or two elements between Ti and B. The preparation method comprises the steps that (1) the ingredients of the Mg-Gd-Er alloy are prepared; (2) industrial pure magnesium ingots are melted; (3) the temperature is increased to 700 DEG C, and industrial pure Zn and intermediate alloy of Mg-Gd, Mg-Er and Mg-Mn are melted; (4) the temperature is increased to 730 DEG C, and industrial pure aluminum ingots and intermediate alloy of Al-Ti, Al-Ti-B andAl-B are melted, so a Mg alloy melt is obtained; (5) low-pressure casting is carried out; and (6) secondary solid solution processing and artificial ageing processing are carried out. The high-strength, high-ductility and heat-resisting Mg-Gd-Er alloy applicable to low-pressure casting provided by the invention has the advantages that tensile strength under a room temperature reaches 305Mpa and aductility rate is 18% after the low-pressure casting, secondary solid solution processing and artificial ageing processing; under high-temperature tension at 200 DEG C, the tensile strength reaches 214 Mpa and the ductility rate is 22%; and the alloy satisfies high-end demands for light-weight development in industries such as aerospace and automobiles.

Description

technical field [0001] The invention relates to a high-strength, toughness and heat-resistant Mg-Gd-Er alloy suitable for low-pressure casting, which meets the high-end requirements for lightweight development in aerospace, automobile, telecommunications and other industries. The invention also relates to a preparation method of a high-strength, toughness and heat-resistant Mg-Gd-Er alloy suitable for low-pressure casting, which belongs 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 b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C23/04C22C1/03C22C1/06B22D18/04C22F1/06C22F1/02
Inventor 刘子利叶兵刘希琴丁文江蒋海燕
Owner FENGYANG L S NET FORMING CO LTD
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