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A kind of high-strength cast magnesium alloy containing Zn and heavy rare earth gd and preparation method thereof

A technology for casting magnesium alloys and heavy rare earths, which can solve problems such as unstable performance and low strength of magnesium alloys by removing certain components, weighing instruments, and analyzing materials, so as to improve the effect, improve mechanical properties, The effect of improving the strength of the alloy

Active Publication Date: 2017-10-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the defects in the prior art, the purpose of the present invention is to propose a high-strength casting magnesium alloy containing Zn and heavy rare earth Gd and its preparation method, so as to overcome the key problems of low strength and unstable performance of existing magnesium alloys

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  • A kind of high-strength cast magnesium alloy containing Zn and heavy rare earth gd and preparation method thereof
  • A kind of high-strength cast magnesium alloy containing Zn and heavy rare earth gd and preparation method thereof

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Embodiment 1

[0045] This embodiment provides a cast magnesium alloy containing Zn and heavy rare earth Gd, the alloy composition (weight percentage) is: 15% Gd, 1% Zn, 0.5% Zr, impurity elements are less than 0.02%, and the rest is Mg.

[0046] The preparation method of the above-mentioned cast magnesium alloy containing Zn and heavy rare earth Gd is as follows:

[0047] (1) According to the 500kg grade magnesium rare earth alloy purification process and ingot preparation technology: the above 500kg raw materials are firstly preheated to 200°C in an oven. The crucible is preheated to dark red after spraying the paint at room temperature. Put pure magnesium into SF 6 / CO 2 Preheat to melt in a dark red crucible under gas protection. Add pure Zn when the melting temperature of pure magnesium rises to about 690°C, and when the temperature continues to rise to about 720°C, slowly add Mg-87Gd master alloy into the melt, keep warm and stir. Then raise the furnace temperature to 780°C and the...

Embodiment 2

[0053] This embodiment provides a cast magnesium alloy containing Zn and heavy rare earth Gd, the alloy composition (weight percentage) is: 10% Gd, 0.5% Zn, 0.3% Zr, impurity elements are less than 0.02%, and the rest is Mg.

[0054] The preparation method of the above-mentioned cast magnesium alloy containing Zn and heavy rare earth Gd is as follows:

[0055] (1) According to the 500kg grade magnesium rare earth alloy purification process and ingot preparation technology: the above 500kg raw materials are firstly preheated to 200°C in an oven. The crucible is preheated to dark red after spraying the paint at room temperature. Put pure magnesium into SF 6 / CO 2 Preheat to melt in a dark red crucible under gas protection. When the melting temperature of pure magnesium rises to about 690°C, pure Zn is added. When the temperature continues to rise to about 720°C, Mg-87Gd master alloy is slowly added to the melt, and stirred after keeping warm. Then raise the furnace temperatu...

Embodiment 3

[0061]This embodiment provides a cast magnesium alloy containing Zn and heavy rare earth Gd, the alloy composition (weight percentage) is: 15% Gd, 2% Zn, 0.5% Zr, impurity elements are less than 0.02%, and the rest is Mg.

[0062] The preparation method of the above-mentioned cast magnesium alloy containing Zn and heavy rare earth Gd is as follows:

[0063] (1) According to the 500kg grade magnesium rare earth alloy purification process and ingot preparation technology: the above 500kg raw materials are firstly preheated to 200°C in an oven. The crucible is preheated to dark red after spraying the paint at room temperature. Put pure magnesium into SF 6 / CO 2 Preheat to melt in a dark red crucible under gas protection. When the melting temperature of pure magnesium rises to about 690°C, pure Zn is added. When the temperature continues to rise to about 720°C, Mg-87Gd master alloy is slowly added to the melt, and stirred after keeping warm. Then raise the furnace temperature ...

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Abstract

The invention discloses a high-strength cast magnesium alloy containing Zn and heavy rare-earth Gd and a preparation method of the high-strength cast magnesium alloy. The high-strength cast magnesium alloy comprises the following components in percent by weight: 10-18 percent of Gd, 0.5-2 percent of Zn, 0.3-0.7 percent of Zr, less than 0.02 percent of inevitable impurities, and the balance of Mg. The preparation method comprises the following steps: weighing the raw materials, smelting the raw materials, casting the smelted material, and conducting the post heat treatment on the cast material. The smelting is conducted under the protection of a solvent or an SF6 and CO2 mixed gas. The post heat treatment comprises two-step solid-solution treatment and one-step aging treatment of the high-strength cast magnesium alloy. The high-strength cast magnesium alloy is simple in process, high in production efficiency, and easily applied to industrial production. The high-strength cast magnesium alloy prepared according to the preparation method can be up to 400-430 MPa in tensile strength at room temperature, and 290-330 MPa in yield strength, is superior to other commercial magnesium alloys in the current market, can be applied in multiple fields such as automobile manufacturing and aerospaces, and meets the requirements of various application occasions.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a casting magnesium alloy containing Zn and heavy rare earth Gd and a preparation method thereof. Background technique [0002] As the metal structure material with the lowest density at present, magnesium alloy has significant weight reduction benefits in high-tech fields such as aerospace, automobiles, and electronics. For example, every 0.45kg reduction in weight of automobiles, commercial aircraft, and aircraft can save $3, $300, and $30,000 respectively . If a large number of magnesium alloys can be used to replace the aluminum alloy and steel structure materials currently mainly used in aerospace, automotive, electronics and other industries, the weight reduction benefit can be effectively realized. [0003] At present, the commercial magnesium alloys on the market are mainly Mg-Al and Mg-Zn systems, but compared with aluminum alloys, the lower strength of these ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06G01N5/04G01N17/00
CPCC22C1/03C22C23/06C22F1/06G01N5/04G01N17/006
Inventor 吴玉娟容伟彭立明陈娟张宇丁文江
Owner SHANGHAI JIAO TONG UNIV
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