Preparation and Properties Characterization of W16Ti20Ta20V44 High Entropy Alloy

Author of the article:YU Xinshan, HUANG He, HUANG Huogen, ZHANG Jiajia, CHEN Xianglin, ZOU Dongli, LANG Dingmu, XU Haiyan

Author's Workplace：Institute of Materials, China Academy of Engineering Physics, Jiangyou 621907, China

Key Words：High-entropy alloys; tungsten alloys; nuclear fusion reactor; materials preparation

Abstract：The design and preparation of W high entropy alloy with low neutron active element were studied for the first wall materials of nuclear fusion reactor. In order to reduce the adverse effect of the high melting point of W on the sample preparation, W16Ti20Ta20V44 alloy with low W content was designed by different criteria. W16Ti20Ta20V44 alloy samples with uniform composition were prepared by powder sintering pre-alloying and vacuum arc melting. The results show that the four-element alloy is a bore-centered cubic single-phase solid solution structure. Due to the influence of cooling rate during the preparation process, two different macrostructures of dendritic and equiaxed crystal are formed. No phase transition occurs below 1 673 K, showing high thermodynamic stability. The compressive strength at room temperature reached 2 665 MPa, the compressive strain is more than 30% , and the fracture mode is mainly brittle fracture composed of intergranular fracture and transgranular fracture.