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龙雁,张伟华,彭亮,李贵琦,彭海燕.超细晶粉末冶金CoCrFeMnNiGd0.15高熵合金的组织性能[J].稀有金属材料与工程(英文),2020,49(11):3841~3846.[Long Yan,Zhang Weihua,Peng Liang,Li Guiqi and Peng Haiyan.Microstructure and Mechanical Properties of Ultrafine-grained CoCrFeMnNiGd0.15 High-entropy Alloy Fabricated by Powder Metallurgy[J].Rare Metal Materials and Engineering,2020,49(11):3841~3846.]
Microstructure and Mechanical Properties of Ultrafine-grained CoCrFeMnNiGd0.15 High-entropy Alloy Fabricated by Powder Metallurgy
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Received:November 14, 2019  Revised:December 13, 2019
DOI:
Key words: metallic  materials, high-entropy  alloys, powder  metallurgy, rare  earth element  Gd, microstructure, mechanical  properties
Foundation item:广东省科技计划项目(2015A010105011), 广东省自然科学基金面上项目(2016A030313483)
Author NameAffiliation
Long Yan,Zhang Weihua,Peng Liang,Li Guiqi and Peng Haiyan  
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Abstract:
      The Ultrafine-grained CoCrFeMnNiGd0.15 high-entropy alloy (HEA) was prepared by mechanical alloying (MA) and spark plasma sintering (SPS). The microstructure and mechanical properties of CoCrFeMnNi Gd0.15 high-entropy alloy was investigated. It was found that the sintered CoCrFeMnNiGd0.15 alloy showed a multi-phase microstructure including the FCC matrix, a rare earth oxide (Gd2O3) and a tetragonal phase rich in Gd, Ni and Mn element. As the sintering temperature increased, the content and size of the precipitated phase increased continuously, the compressive yield strength of the alloy decreased while the plasticity showed the opposite trend. The sintered alloy achieved the best comprehensive mechanical properties at the sintering temperature of 900 °C, with a compressive yield strength of 1662 MPa, compressive strength of 2518 MPa, plastic strain of 30.6% and Vickers hardness of 458 Hv. With the increase of temperature, the fracture morphology of compressive specimens consisted of fine equiaxed dimples, the diameter and depth of the dimples increased continuously and some tearing ridges were observed.