|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||SIM Transformation and Superelasticity of TiZrHfAlNb High Entropy Alloys
||Lu Wang, Qinjia Wang, Xidong Hui
|On-Site Speaker (Planned)
The discovery of metastable multi-phase configurations opened a new pathway to overcome the strength-ductility trade-off both in FCC and BCC high entropy alloys (HEAs). The shape memory effect and superelasticity are based on the reversible transformation of the metastable phase during loading-unloading or following heating. In this work, the metastable non-equiatomic TiZrHfNbAl HEAs with superelasticity were investigated. The HEAs are consisted of bcc and α′′ phase with all the elements uniformly distributed in the microstructure, suggesting that both phases are of solid solution strengthening effect. The HEAs exhibit double-yielding phenomena at about 345 MPa and 1000 MPa, respectively. Stress-induced martensitic transformation from β→α′′ was confirmed in these HEAs by the in-situ high-energy X-ray diffraction. The unloading experiments showed that the transformation was reversible and the recovered strain reached up to 5.3% at the 6% pre-strain. These findings demonstrate a potential for the HEAs to be as superelastic alloys.
||Planned: Supplemental Proceedings volume