High-intensity high-toughness Mg-Zn-Y-Gd-Zr alloy and preparation method thereof

A high-toughness, high-strength technology, applied in the field of alloys and their preparation, can solve the problems of high rare earth content in alloys

Active Publication Date: 2014-11-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-strength and high-toughness Mg-Zn-Y-Gd-Zr alloy and its prep

Method used

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  • High-intensity high-toughness Mg-Zn-Y-Gd-Zr alloy and preparation method thereof

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specific Embodiment approach 1

[0021] Specific Embodiment 1: In this embodiment, the high-strength and high-toughness Mg-Zn-Y-Gd-Zr alloy consists of 8-12% Zn, 1-6% Y, 1-6% Gd, 0.3-0.7% Zr and The balance is composed of Mg.

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the high-strength and high-toughness Mg-Zn-Y-Gd-Zr alloy consists of 8.12% Zn, 5.95% Y, 1.01% Gd, 0.31% Zr and The balance is composed of Mg. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Specific embodiment three: The difference between this embodiment and specific embodiment one or two is that the high-strength and high-toughness Mg-Zn-Y-Gd-Zr alloy consists of 10.06% Zn, 4.75% Y, 1.32% Gd, Composition of 0.46% Zr and balance Mg. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a high-intensity high-toughness Mg-Zn-Y-Gd-Zr alloy and a preparation method thereof and relates to an alloy and a preparation method thereof. The invention aims to solve the technical problem of high rare earth content in an alloy prepared by an existing method. The alloy disclosed by the invention consists of Zn, Y, Gd, Zr and Mg. The preparation method comprises the following steps: weighing raw materials, adding pure magnesium into a crucible, heating the crucible and then filling mixed gas of CO2 and SF6 into the crucible to carry out protection; after the pure magnesium is completely molten, sequentially adding other raw materials; preparing a cast ingot; homogenizing and extruding the cast ingot, carrying out heat preservation at an aging temperature and cooling to obtain the high-intensity high-toughness Mg-Zn-Y-Gd-Zr alloy. The total rare earth content of the high-intensity high-toughness Mg-Zn-Y-Gd-Zr alloy is lower than 6 weight percent; by improving zinc content and a Zn/RE atomic ratio, a stable quasicrystalline phase and a long-period ordered structural phase (LPSO) are obtained; tensile intensity of the alloy disclosed by the invention is higher than 500MPa; elongation of the alloy disclosed by the invention is greater than 5 percent. The invention belongs to the field of preparation of alloys.

Description

technical field [0001] The invention relates to an alloy and a preparation method thereof. Background technique [0002] As the lightest commercial metal engineering structural material, magnesium alloy has the advantages of high specific strength and specific elastic modulus, superior damping, shock absorption and noise reduction performance, good casting formability, and easy recycling. It is known as "green structural material in the 21st century". ", which has broad application prospects. In recent years, magnesium and its alloys have attracted extensive attention as lightweight structural materials. Among them, rare earth magnesium alloys have excellent mechanical properties and heat resistance at room temperature, especially deformed magnesium alloys with high rare earth content containing a large amount of Gd and Y have ultra-high strength and high toughness, and their tensile strength is higher than 500MPa, and their tensile elongation is higher than 5% (Effect of ...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/03C22F1/06
Inventor 郑明毅姜汉斯乔晓光池元清吴昆
Owner HARBIN INST OF TECH
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