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超细晶粉末冶金CoCrFeMnNiGd0.15高熵合金的组织性能
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华南理工大学广东省金属新材料制备与成形重点实验室 广州510640

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广东省科技计划项目(2015A010105011), 广东省自然科学基金面上项目(2016A030313483)


Microstructure and Mechanical Properties of Ultrafine-grained CoCrFeMnNiGd0.15 High-entropy Alloy Fabricated by Powder Metallurgy
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    摘要:

    采用机械合金化和放电等离子烧结的方法制备出超细晶CoCrFeMnNiGd0.15合金,研究了CoCrFeMnNiGd0.15高熵合金的组织与性能。结果表明,其组织为多相结构,基体为FCC固溶体相,析出相为稀土氧化物(Gd2O3)和富Gd、Ni、Mn的四方结构相。随着烧结温度的提高,析出相的含量不断增加且尺寸不断增大,合金的压缩屈服强度不断下降而塑性则不断上升。在900℃烧结时材料具有最优的综合力学性能,其压缩屈服强度(σ0.2)、抗压强度(σmax)、断裂时的塑性应变(εp)和维氏硬度分别达到1662 MPa、2518 MPa、30.6%和458 Hv。

    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.

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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,2020,49(11):3841~3846.[Long Yan, Zhang Weihua, Peng Liang, Li Guiqi, 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.]
DOI:10.12442/j. issn.1002-185X.20190954

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  • 收稿日期:2019-11-14
  • 最后修改日期:2019-12-13
  • 录用日期:2020-01-03
  • 在线发布日期: 2020-12-09
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