TY - JOUR
T1 - Microstructure and mechanical properties of WMoTaNbTi refractory high-entropy alloys fabricated by selective electron beam melting
AU - Xiao, Bang
AU - Jia, Wenpeng
AU - Tang, Huiping
AU - Wang, Jian
AU - Zhou, Lian
N1 - Publisher Copyright:
© 2021
PY - 2022/5/10
Y1 - 2022/5/10
N2 - WMoTaNbTi RHEAs formed by SEBM with negative defocus distance were investigated. Four 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 powder. Significant vaporization of Nb and Ti elements happened during the formation of WMoTaNbTi RHEAs, however, the single BCC phase remains stable. Weakened 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 ductility. Microhardness 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, respectively. The as-deposited WMoTaNbTi RHEA formed at a scanning speed of 2.5 m/s displays ultimate strength of 1312 MPa.
AB - WMoTaNbTi RHEAs formed by SEBM with negative defocus distance were investigated. Four 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 powder. Significant vaporization of Nb and Ti elements happened during the formation of WMoTaNbTi RHEAs, however, the single BCC phase remains stable. Weakened 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 ductility. Microhardness 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, respectively. The as-deposited WMoTaNbTi RHEA formed at a scanning speed of 2.5 m/s displays ultimate strength of 1312 MPa.
KW - Porosity
KW - Refractory high-entropy alloys
KW - Selective electron beam melting
KW - Solid-solution strengthening
KW - Solidification cracking
UR - http://www.scopus.com/inward/record.url?scp=85118342620&partnerID=8YFLogxK
U2 - 10.1016/j.jmst.2021.07.041
DO - 10.1016/j.jmst.2021.07.041
M3 - 文章
AN - SCOPUS:85118342620
SN - 1005-0302
VL - 108
SP - 54
EP - 63
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -