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Quasi-crystal enhanced high-strength magnesium-zinc-yttrium (Mg-Zn-Y) alloy and preparation method thereof

A high-strength, alloying technology, applied in the field of quasicrystal reinforced magnesium alloys and their preparation, can solve the problems that the mechanical properties of materials are difficult to provide beneficial contributions, and the quasicrystal phase is coarse.

Inactive Publication Date: 2012-08-01
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the herringbone-like quasicrystal phase in the Mg-Zn-Y alloy prepared by conventional casting method is very coarse, and it is difficult to make a beneficial contribution to the mechanical properties of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] This example is a high-strength Mg-Zn-Y alloy, its composition is Mg-5wt.%Zn-1wt.%Y, the mass ratio of Zn to Y is 5, wherein Zn is added with industrial Zn, and Y is added with Mg-25wt .%Y master alloy is added, and Mg is industrial pure magnesium.

[0012] The preparation method of this embodiment is:

[0013] The first step is to preheat the crucible to 200°C, and paint the crucible coating for general magnesium alloy melting;

[0014] In the second step, the crucible was heated to 500°C, industrial pure Mg was added into the crucible and CO 2 +0.5vol%SF 6 Mixed gas for protection;

[0015] In the third step, continue to heat up until the pure magnesium is completely melted, then add Zn, Mg-25wt.%Y master alloy at 720°C. The way of adding Mg-25wt.%Y master alloy is to use an iron bell jar to press into the alloy melt, and slightly swim around to prevent the segregation of rare earths, so that the rare earths can be quickly and evenly diffused into the melt. The b...

Embodiment 2

[0021] This example is a high-strength Mg-Zn-Y alloy, which becomes Mg-6wt.%Zn-1wt.%Y, and the mass ratio of Zn to Y is 6, wherein Zn is added with industrial Zn, and Y is added with Mg-25wt .%Y master alloy is added, and Mg is industrial pure magnesium.

[0022] The preparation method of this embodiment is:

[0023] The first step is to preheat the crucible to 200°C, and paint the crucible coating for general magnesium alloy melting;

[0024] In the second step, the crucible was heated to 500 °C, industrial pure Mg was added into the crucible and CO 2 +0.5vol%SF 6 Mixed gas for protection;

[0025] In the third step, continue to heat up until the pure magnesium is completely melted, then add Zn, Mg-25wt.%Y master alloy at 720°C. The way of adding Mg-25wt.%Y master alloy is to use an iron bell jar to press into the alloy melt, and slightly swim around to prevent the segregation of rare earth, so that the rare earth can be quickly and evenly diffused into the melt. Pure Zn...

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Abstract

The invention relates to a high-strength magnesium alloy and a preparation method thereof, in particular to an enhanced high-strength magnesium-zinc-yttrium (Mg-Zn-Y) alloy capable of precipitating small similarly-spherical quasi-crystal phase through solution and aging. The mass percent of chemical elements in the alloy is that: 5 to 6 percent of Zn, 1 percent of Y, Mg supplementing the percentage to 100 percent, and the mass ratio of the Zn and Y falls in between 5 and 6. Zn is added in a form of pure Zn, Y is added in a Mg-Y master-alloy form with Y content of 25 percent by weight, and Mg adopts the industrial pure magnesium. The alloy prepared through preheating, smelting, refining, metal forming and heat treatment consists of alpha-Mg solid melt and icosahedron quasi-crystal phase, the shape of the quasi-crystal phase is similar to a spherical shape, and the size is small. The precipitated quasi-crystal particles are propped against dislocated intermediate pinning and a firm interfaces with a substrate, so that the magnesium alloy can be remarkably strengthened. The tensile strength of the high-strength magnesium alloy is more than 250MPa, and the elongation rate is more than5 percent. Due to the adoption of the quasi-crystal enhanced high-strength Mg-Zn-Y alloy and the preparation method thereof, the high-strength magnesium can be widely popularized to use in fields such as aviation, aerospace, traffics and the like.

Description

technical field [0001] The invention relates to a high-strength magnesium alloy material and its preparation technology, in particular to a quasi-crystal reinforced magnesium alloy and its preparation method. technical background [0002] Magnesium alloy is the lightest metal structural material in engineering applications, and is known as "green engineering metal structural material in the 21st century". In recent years, with the rapid development of aviation, aerospace, transportation and other fields, higher requirements have been put forward for lightweight and high specific strength magnesium alloys, thus forcing people to find new solutions in alloy design and advanced processing technology. breakthrough. Mg-Zn-Y alloy is a very promising low-cost high-strength magnesium alloy, mainly because the alloy can obtain an icosahedral quasi-crystal phase (I-phase) with high-strength properties under conventional casting conditions. In the Mg-Zn-Y ternary alloy system, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C1/03C22C1/06C22F1/06
Inventor 万迪庆刘雅娟
Owner EAST CHINA JIAOTONG UNIVERSITY
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