High-strength heat-resisting casting magnesium alloy and preparation method

A technology for casting magnesium alloys and magnesium alloys is applied in the field of high-strength and heat-resistant casting magnesium alloys and its preparation, and achieves the effects of good plasticity, excellent high-temperature strength and creep resistance, and simple process

Inactive Publication Date: 2017-08-25
HUANGHE S & T COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the patent includes Y, Gd and Nd alloy elements, it does not include Ca element, Y higher than 10wt.% and Nd higher than 2wt.%, and it does not contain Si, Sb, Ti, Sn , Sr, Bi, Cd and other elements

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  • High-strength heat-resisting casting magnesium alloy and preparation method

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Embodiment 1

[0032] A high-strength heat-resistant casting magnesium alloy, the mass percent of which is: Gd8%, Y4%, Zr0.5%, Ca0.4%, Si0.005%, cerium-rich mixed rare earth 2.1%, and the rest is Mg.

[0033] A method for preparing a high-strength heat-resistant cast magnesium alloy, comprising a smelting process and a heat treatment process, the smelting process comprising the following steps:

[0034] S1, material preparation: prepare the Mg-Gd master alloy containing 8% Gd of the total weight of the prepared alloy, the Mg-Y master alloy containing 4% Y, the Mg-Ca master alloy containing 0.4% Ca, and the K containing 0.5% Zr 2 ZrF 6 Mixed salt, the balance is pure Mg;

[0035]S2, baking material: Mg-Gd master alloy, Mg-Y master alloy, Mg-Ca master alloy, K 2 ZrF 6 Mixed salt and pure Mg are preheated and dried at 180-220°C;

[0036] S3, molten magnesium: melting the dried pure Mg into Mg liquid;

[0037] S4. Adding Gd and Y: adding the master alloy Mg–Gd to the Mg solution at 720-740°...

Embodiment 2

[0047] A high-strength heat-resistant cast magnesium alloy, the mass percent of which is: Gd6%, Y2%, Zr0.3%, Ca0.3%, Si0.01%, cerium-rich mixed rare earth 0.7%, and the rest is Mg.

[0048] The room temperature mechanical properties and high temperature creep resistance of embodiment two T6 state are:

[0049] Tensile Strength: 370MPa, Yield Strength: 330MPa, Elongation: 5.5%, Elastic Modulus: 52GPa, Steady State Creep Rate: 3.4×10 -7 / % s.

Embodiment 3

[0051] A high-strength heat-resistant cast magnesium alloy, the mass percent of which is: Gd10%, Y4%, Zr0.5%, Ca0.4%, Si0.01%, cerium-rich mixed rare earth 2.0%, and the rest is Mg.

[0052] The room temperature mechanical properties and high temperature creep resistance of embodiment three T6 states are:

[0053] Tensile Strength: 377MPa, Yield Strength: 340MPa, Elongation: 5.0%, Elastic Modulus: 59GPa, Steady State Creep Rate: 4.0×10 -7 / % s.

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Abstract

The invention discloses a high-strength heat-resistant cast magnesium alloy, the mass percent of which is: Gd6-13%, Y2-6%, Zr0.3-0.8%, Ca0.3-0.6%, Si≤0.01%, cerium-rich mixture Rare earth 0.7-3.0%, the rest is Mg; a preparation method of high-strength heat-resistant cast magnesium alloy, including melting process and heat treatment process. The magnesium alloy of the present invention can meet the requirements of higher mechanical properties and high-temperature creep resistance. The method solves the problems of Ce, La, and The strengthening effect of alloying elements such as Pr in metal magnesium is not high and unstable.

Description

technical field [0001] The invention relates to the field of nonferrous metals, in particular to a high-strength heat-resistant cast magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the metal with the lowest density among practical metals. It has the characteristics of high specific strength, good specific stiffness, and good shock resistance and noise reduction performance. It is an ideal metal structural material. At present, magnesium alloy products are mainly die castings, and high-performance forgings are rarely used. The main reason is that magnesium alloy has poor plasticity at room temperature, is sensitive to deformation rate, and is difficult to forge. The crystal structure of magnesium alloy is close-packed hexagonal, there are few slip systems that can be activated at room temperature, and the plastic deformation ability is poor. The strain state of free forging is one-to-compression two-phase extension, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C23/06C22C1/03C22F1/002C22F1/06
Inventor 张保丰陈小伟闫盼盼
Owner HUANGHE S & T COLLEGE
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