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High-strength and high-elasticity-modulus casting Mg alloy and preparation method thereof

A high-elastic casting magnesium alloy technology, applied in the field of magnesium alloy processing, can solve the problems of poor elastic deformation resistance, low elastic modulus, etc., and achieve long-lasting thinning effect, long-lasting effect, and good decay resistance

Active Publication Date: 2015-09-23
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is a pity that B.Y.Tang et al. published First-principles investigation of the structural and mechanical properties ofβ″phase in "Journal of Alloys and Compounds" (Journal of Alloys and Compounds) 2010, Volume 492, Issue 1-2, Page 416-420 Mg–Gd alloy system (first-principle research on the structure and mechanical properties of β″ phase in Mg–Gd alloy system) showed that MgGd(56.9GPa), Mg 3 Gd(46.1GPa), Mg 7 Gd(52.6GPa), MgY(55.7GPa), Mg 24 Y 5 (53.8GPa) and MgNd (55.4GPa) and other phases have relatively low elastic modulus, which makes the elastic modulus of the Mg-RE alloy relatively low, only 40-45GPa, which ultimately leads to poor elastic deformation resistance and cannot meet The demand for lightweight, high-strength and high-modulus magnesium alloy materials in the engineering field

Method used

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  • High-strength and high-elasticity-modulus casting Mg alloy and preparation method thereof
  • High-strength and high-elasticity-modulus casting Mg alloy and preparation method thereof
  • High-strength and high-elasticity-modulus casting Mg alloy and preparation method thereof

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Embodiment 1

[0041] The components and mass percentages of the high-strength and high-elastic-modulus cast magnesium alloy involved in this embodiment are: 6wt% Gd, 5wt% Y, 5wt% Li, 6wt% Al, and the content of impurity elements Si, Fe, Cu and Ni Less than 0.03wt%, and the balance is Mg (wt% refers to the percentage of components in the total mass of the prepared magnesium alloy, and the total mass is the sum of the mass of Mg, Al, Li and various master alloys).

[0042] The preparation method of the magnesium alloy includes two process steps of vacuum smelting and subsequent heat treatment.

[0043] Among them, the previous vacuum smelting process steps are as follows:

[0044] (1) Baking material: Preheat pure Mg, pure Al, intermediate alloys Mg–Gd and Mg–Y at 170°C for more than 3 hours, while pure Li does not need to be preheated;

[0045] (2) Melting Mg, Gd, Y and Al: Preheat the crucible in the vacuum induction melting furnace to 400°C, and put it in the middle of dried pure Mg, pure...

Embodiment 2

[0053] The components and mass percentages of the high-strength and high-elastic-modulus cast magnesium alloy involved in this embodiment are: 12wt% Gd, 1wt% Y, 1wt% Li, 2wt% Al, and the content of impurity elements Si, Fe, Cu and Ni Less than 0.03wt%, the balance is Mg.

[0054] The preparation method of the magnesium alloy includes two process steps of vacuum smelting and subsequent heat treatment.

[0055] Among them, the previous vacuum smelting process steps are as follows:

[0056] (1) Baking material: Preheat pure Mg, pure Al, intermediate alloys Mg–Gd and Mg–Y at 230°C for more than 3 hours, while pure Li does not need to be preheated;

[0057] (2) Melting Mg, Gd, Y and Al: Preheat the crucible in the vacuum induction melting furnace to 500°C, and put it in the middle of dried pure Mg, pure Al, Mg-Gd and Mg-Y, Mg-Gd The alloy is Mg-50wt%Gd, that is, Gd accounts for 50wt% in the master alloy Mg-Gd, and the addition is determined according to the mass percentage (i.e. ...

Embodiment 3

[0065] The components and mass percentages of the high-strength and high-elastic-modulus cast magnesium alloy involved in this embodiment are: 9wt% Gd, 3wt% Y, 3wt% Li, 4wt% Al, and the content of impurity elements Si, Fe, Cu and Ni Less than 0.03wt%, the balance is Mg.

[0066] The preparation method of the magnesium alloy includes two process steps of vacuum smelting and subsequent heat treatment.

[0067] Among them, the previous vacuum smelting process steps are as follows:

[0068] (1) Baking material: Preheat pure Mg, pure Al, intermediate alloys Mg–Gd and Mg–Y at 200°C for more than 3 hours, while pure Li does not need to be preheated;

[0069] (2) Melting Mg, Gd, Y and Al: Preheat the crucible in the vacuum induction melting furnace to 450°C, and put it in the middle of dried pure Mg, pure Al, Mg–Gd, Mg–Y, Mg–Gd The alloy is Mg-35wt%Gd, that is, Gd accounts for 35wt% in the master alloy Mg-Gd, and the addition amount is determined according to the mass percentage (ie...

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Abstract

The invention provides a high-strength and high-elasticity-modulus casting Mg alloy and a preparation method thereof. The Mg alloy comprises 6-12wt% of Gd, 1-5wt% of Li, 1-5wt% of Y, 2-6wt% of Al, the balance of Mg and inevitable impurities, wherein the total content of Si, Fe, Cu and Ni in the impurities is smaller than 0.03wt%. The preparation method of the Mg alloy includes the sequential steps of vacuum melting and heat treatment. Compared with the prior art, the preparation method has the advantages that by adopting a vacuum induction melting furnace for melting, inclusions generated in the melting process are reduced, and the retention time of a melt at a high temperature is substantially shortened; the effects of solution strengthening and age hardening of the Mg alloy can be fully exerted under the optimized heat treatment process.

Description

technical field [0001] The invention relates to a cast magnesium alloy with high strength and high elastic modulus and a preparation method thereof, belonging to the technical field of magnesium alloy processing. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in practical application. It has the advantages of low density, high specific strength and specific stiffness, good damping and shock absorption, good thermal conductivity, and excellent machining performance. It has great potential in automotive, aerospace and other fields. Very broad application prospects. In recent years, the speed of aerospace and transportation vehicles is getting higher and higher, the power required is increasing, the stability of components is required to be high and reliable, and higher requirements are placed on the stiffness and elastic deformation resistance of magnesium alloys. . At the same time, most aerospace magnesium alloy parts are ...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03
Inventor 吴国华刘文才李艳磊丁文江闵昌万王少华周克华
Owner SHANGHAI JIAO TONG UNIV
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