|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||High Entropy Alloys IV
||Tensile Properties of Refractory High-entropy HfNbTaTiZr Alloy
||Che-Wei Tsai, Chien-Chang Juan, Jien-Wei Yeh
|On-Site Speaker (Planned)
Recently, developing refractory high-entropy alloys have received lots of attention to increase the working temperature of components in jet turbine engines. Higher inlet temperature increases engine efficiency and reduce fuel cost. However, most of refractory HEAs were reported with encouraging mechanical properties at high temperatures, but low ductility at room temperature. One exception is the HfNbTaTiZr alloy reported in 2011. This alloy has single BCC solid solution phase which exhibits high yield strength and a fracture strain over 50% under compressive test.
In this study, the HfNbTaTiZr alloy with a grain size of 38 μm is prepared after rolling and homogenization. Tensile test is conducted to reveal the actual tensile behavior and properties. The results show the alloy possesses high tensile yield strength and good elongation of 18%. Strain hardening rate is very particular, and significant necking are observed. Fracture surface reveals dimple-rupture mode. The related mechanism is discussed.
||Planned: A print-only volume