Microstructure and mechanical properties of WMoTaNbTi refractory high-entropy alloys fabricated by selective electron beam melting

作     者：Bang Xiao Wenpeng Jia Huiping Tang Jian Wang Lian Zhou Bang Xiao;Wenpeng Jia;Huiping Tang;Jian Wang;Lian Zhou

作者机构：State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Porous Metal MaterialsNorthwest Institute for Non-ferrous Metal ResearchXi’an 710016China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第108卷第13期

页      面：54-63页

核心收录：

学科分类：0806[工学-冶金工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：the State Key Laboratory of Porous Metal Materials Northwest Institute for Non-ferrous Metal Research for providing the research funding 

主　　题：Refractory high-entropy alloys Selective electron beam melting Solidification cracking Porosity Solid-solution strengthening 

摘      要：WMoTaNbTi RHEAs formed by SEBM with negative defocus distance were *** scanning speeds were applied,an electron beam with scanning speed at 2.5 m/s completely fused the premixed WMoTaNb alloyed powder and pure Ti *** vaporization of Nb and Ti elements happened during the formation of WMoTaNbTi RHEAs,however,the single BCC phase remains *** solid-solute strengthening caused by elemental vaporization,dropping percentage of Nb and Ti solutes in the matrix as well as improved ductilizing effects with decreasing scanning speeds leads to falling microhardness and better local *** of scanning speed at 4.0 m/s,3.5 m/s,3.0 m/s and 2.5 m/s is 578±17 HV,576±12 HV,573±10 HV and 511±2 HV,*** as-deposited WMoTaNbTi RHEA formed at a scanning speed of 2.5 m/s displays ultimate strength of 1312 MPa.