Microstructure evolution and mechanical properties of an annealed dual-phase CrFeCoNiAl0.7 high-entropy alloy

作者：Wang, Qiang^*; Wang, Hailing; Gao, Tengfei; Qian, Lihua; Zeng, Liangcai; Chen, Qiang^*; Liu, Xinwang

来源：Intermetallics, 2022, 149: 107657.

DOI：10.1016/j.intermet.2022.107657

• High -entropy alloy
• Annealing
• Microstructure
• Precipitation
• Deformation and fracture

The present work investigated microstructures and mechanical properties of an annealed dual-phase high -entropy alloy (HEA) CrFeCoNiAl0.7 between 700 and 1100 degrees C. It revealed that with the increased annealing temperature, there were rod-like B2 phase precipitating from the FCC-solution matrix, and the orientation between the precipitated B2 phase and the FCC matrix obeyed Kurdjumov-Sachs (K-S) relationship {111}(FCC)// {011}(B2) and <011 >(FCC)//<111 >(B2). The higher annealing temperature resulted in a drastic drop in yield strength, but a significant increase in fracture strain and work-hardening capacity. The positive value of the strain rate sensitivity (SRS) decreased with strain and the SRS of the HEA sample annealed at a lower temperature decreased greatly. Due to the formation of co-clusters, the activation volume of the annealed HEA presented an abnormal trend, that was, it increased with strain.

• 单位
  华中科技大学