Microstructure and mechanical properties of Ti-Al-Ni-Co-Fe based high entropy alloys prepared by powder metallurgy route

摘要

Nano crystalline High Entropy Alloys (HEA) with equi-atomic compositions were synthesized through mechanical alloying followed by Spark Plasma Sintering (SPS). Alloys with nominal compositions of TiAlNiCo, TiAlNiFe and TiAlNiCoFe were selected for the study. Microstructure, hardness and room temperature compressive strengths of the alloys were studied. All the alloys had a single phase BCC microstructure along with TiCx nanoparticles dispersed uniformly in it. The alloys exhibit good hardness of more than 700 HV1.0 and a compressive strength more than 2.5 GPa. (C) 2019 Elsevier B.V. All rights reserved.