Microstructure and Mechanical Properties of Ultrafine-Grained CoCrFeMnNiGd0.15 High-Entropy Alloy Fabricated by Powder Metallurgy [超细晶粉末冶金CoCrFeMnNiGd0.15高熵合金的组织性能]

作者：Long Y.^*; Zhang W.; Peng L.; Li G.; Peng H.

来源：Rare Metal Materials and Engineering, 2020, 49(11): 3841-3846.

• High-entropy alloys
• Mechanical properties
• Metallic materials
• Microstructure
• Powder metallurgy
• Rare earth element Gd

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 CoCrFeMnNiGd0.15 high-entropy alloy were investigated. Results indicate that the sintered CoCrFeMnNiGd0.15 alloy shows 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 increases, the content and size of the precipitated phase increase continuously, the compressive yield strength of the alloy decreases while the plasticity shows the opposite trend. The sintered alloy achieves the best comprehensive mechanical properties at the sintering temperature of 900℃, with compressive yield strength of 1662 MPa, compressive strength of 2518 MPa, plastic strain of 30.6 % and Vickers hardness of 4580 MPa.

• 单位
  华南理工大学