Abstract
? 2022 Elsevier B.V.Refractory high-entropy alloys (RHEAs), which exhibit excellent mechanical properties at room temperature and high temperature, have received widespread attention. The TiZrHfNbTa alloy is one of the few refractory high-entropy alloys with tensile ductility. Alloying means is a common method to optimize the special properties of alloys. Here, a series of TiZrHfNbTaWx (x = 0–1) RHEAs were synthesized by arc melting technique. It showed that the fracture plasticity of the RHEAs changed from ＞50% of the TiZrHfNbTa to 20.7% of the TiZrHfNbTaW, and the yield strength increased from 1064 MPa of the TiZrHfNbTa to 1726 MPa of the TiZrHfNbTaW. In addition, The TiZrHfNbTaWx RHEAs predominantly consisted of a single random solid solution phase with body-centered cubic (BCC) crystal structure. The present result indicated that W addition could effectively enhance the strength of the TiZrHfNbTa alloy, while maintaining high plasticity. Finally, a simple solid solution strengthening theoretical model was proposed to explain the high yield strength, and the experimental values were in good agreement with the theoretical values.
NSTL
Elsevier