Open AccessPrecipitation-hardened refractoryTi-Nb-Hf-Al-Ta high-entropy alloys
Author(s) -
E. Panina,
N. Yurchenko,
Sergey Zherebtsov,
Г. А. Салищев,
Nikita Stepanov
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1014/1/012041
Subject(s) - materials science , orthorhombic crystal system , alloy , annealing (glass) , metallurgy , high entropy alloys , precipitation , ductility (earth science) , titanium alloy , crystallography , crystal structure , creep , chemistry , physics , meteorology
This study reports the structure and mechanical properties of new refractory Ti 37.5 Nb 12.5 Hf 25 Al 25 , Ti 40 Nb 30 Hf 15 Al 15 , and Ti 40 Nb 20 Ta 10 Hf 15 Al 15 (at.%) high entropy alloys. After annealing at 1200 °C for 24 h, the program alloys had a single-phase B2 structure. Further annealing at 600 °C for 24 h resulted in the formation of Widmanstatten orthorhombic particles (O-phase) in the bcc matrix. The Ti 40 Nb 30 Hf 15 Al 15 and Ti 40 Nb 20 Ta 10 Hf 15 Al 15 alloys annealed at T = 1200 °C showed moderate strength and good ductility (>50%) at 22 and 600 °C; while the Ti 37.5 Nb 12.5 Hf 25 Al 25 alloy was stronger, but less ductile at both temperatures. Subsequent annealing at T = 600 °C significantly increased the strength of the Ti 40 Nb 30 Hf 15 Al 15 alloy at 22 and 600 °C, maintaining compressive sufficient ductility at room-temperature.