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Magnesium-based high-entropy alloy with high toughness and high hardness and preparation method

A high-entropy alloy, high-strength toughness technology, applied in the field of alloys, can solve the problems of high brittleness of high-entropy alloys, achieve high mixing entropy and ensure uniformity

Active Publication Date: 2018-12-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high brittleness of high-mixing entropy alloys has become a bottleneck for its application

Method used

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  • Magnesium-based high-entropy alloy with high toughness and high hardness and preparation method
  • Magnesium-based high-entropy alloy with high toughness and high hardness and preparation method
  • Magnesium-based high-entropy alloy with high toughness and high hardness and preparation method

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Embodiment 1

[0028] A method for preparing a magnesium-based high-entropy alloy with high strength, toughness and high hardness, comprising the following steps: according to the atomic percentage (at.%) Mg: 35%, Al: 25%, Gd: 20%, and Y in the magnesium-based high-entropy alloy: 10%, Zn: 10%, 5.43g of Al ingot and 5.26g of Zn ingot with a purity of 99.9wt.%, 23.85g of Mg-30Y master alloy and 84.36g of Mg-30Gd master alloy were placed in a crucible for melting. The melting temperature is 760°C (holding temperature for 15 minutes), and the casting temperature is 740°C. Cast alloy liquid into graphite mold (water cooling) to get Mg 35 Al 25 Gd 20 Y 10 Zn 10 alloy ingot. The obtained alloy ingot was measured by a microhardness tester (load 29.42N, holding time 10 seconds), and the hardness was HV115.6. The obtained alloy ingot was compressed and measured by a UTM-5305 electronic universal testing machine, and the compressive strength at room temperature was 496.65 MPa, and the elongation ...

Embodiment 2

[0030] A method for preparing a magnesium-based high-entropy alloy with high strength, toughness and high hardness, comprising the following steps: according to the atomic percentage (at.%) Mg: 35%, Al: 20%, Gd: 20%, and Y in the magnesium-based high-entropy alloy: 10%, Zn: 15%, 4.21g of Al ingot and 7.65g of Zn ingot with a purity of 99.9wt.%, 23.13g of Mg-30Y master alloy and 81.83g of Mg-30Gd master alloy were placed in a crucible for melting. The melting temperature is 760°C (holding temperature for 15 minutes), and the casting temperature is 740°C. Cast alloy liquid into graphite mold (water cooling) to get Mg 35 Al 20 Gd 20 Y10 Zn 15 alloy ingot. The obtained alloy ingot was measured by a microhardness tester (load 29.42N, holding time 10 seconds), and the hardness was HV103.3. The obtained alloy ingot was compressed and measured by a UTM-5305 electronic universal testing machine, and the compressive strength at room temperature was 481.48 MPa, and the elongation wa...

Embodiment 3

[0032] A method for preparing a magnesium-based high-entropy alloy with high strength, toughness and high hardness, comprising the following steps: according to the atomic percentage (at.%) Mg: 30%, Al: 25%, Gd: 20%, and Y in the magnesium-based high-entropy alloy: 15%, Zn: 10%, 4.128g of Al ingot and 4.002g of Zn ingot with a purity of 99.9wt.%, 27.20g of Mg-30Y master alloy and 64.16g of Mg-30Gd master alloy were placed in a crucible for melting. The melting temperature is 760°C (holding temperature for 15 minutes), and the casting temperature is 740°C. Cast alloy liquid into graphite mold (water cooling) to get Mg 30 Al 25 Gd 20 Y 15 Zn 10 alloy ingot. The obtained alloy ingot was measured by a microhardness tester (load 29.42N, holding time 10 seconds), and the hardness was HV123.7. The obtained alloy ingot was compressed and measured by a UTM-5305 electronic universal testing machine, and the compressive strength at room temperature was 458.23 MPa, and the elongatio...

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Abstract

The invention belongs to the technical field of alloys and discloses a magnesium-based high-entropy alloy with high toughness and high hardness and a preparation method. By taking Mg as a base, and selecting main elements Al, Gd, Y and Zn beneficial to reinforcement and hardness improvement of a magnesium alloy, the magnesium-based high-entropy alloy with high toughness and high hardness and the preparation method are developed. The magnesium-based high-entropy alloy has an engineering stress-strain curve with a remarkable processing hardening characteristic, has microhardness of HV103.3-123.7, room-temperature tension strength of 458.01-496.65MP, and a compression ratio after breakage of 14.83-17.28%, and in addition, the magnesium-based high-entropy alloy disclosed by the invention is simple in preparation method and easy in condition control.

Description

technical field [0001] The invention belongs to the field of alloy technology, and relates to a MgAlGdYZn magnesium-based high-entropy alloy with high strength, toughness and high hardness designed based on the idea of ​​high-entropy alloys and a preparation method. Background technique [0002] As the lightest metal structural material in engineering applications, magnesium alloy has the characteristics of high specific strength, high specific stiffness and good damping performance, and is widely used in aviation, aerospace, communication, automobile and other industries. However, the strength of cast magnesium alloy is low. Even the highest strength Mg-Ga-Y-Zn cast alloy has a strength of only 350-380MPa, an elongation of 9-12%, and a hardness lower than 100HV. The lack of absolute strength and hardness of magnesium alloys has become a bottleneck in the field of magnesium alloy research. [0003] At present, the main method to improve the strength and toughness of magnesi...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/03
CPCC22C1/03C22C23/02C22C30/00
Inventor 徐丹林小娉黄铎权力伟陈达平申睿
Owner NORTHEASTERN UNIV
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