High Temperature Deformation Behavior and Processing Maps of FeCoNiCrAlTi Dual Phase High Entropy Alloy

Abstract

The present study explores the high temperature deformation behavior of FeCoNiCrAlTi dual phase high entropy alloy (henceforth referred to as DP-HEA) in the temperature range of 900–1100 °C (1173–1373 K) and the strain rate varying from 0.001 to 0.1 s−1. The as-cast sample has been characterized using scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry, which reveals the presence of two phases, disordered γ and ordered γ′. A constitutive relationship between the process parameters (stress temperature, strain, and strain rate) has been drawn using the Arrhenius-type equation to recognize the high temperature deformation behavior of the DP-HEA. The optimum thermomechanical processing window of the DP-HEA has been determined by constructing multiple contour maps based on different parameters such as efficiency, strain rate sensitivity, etc. And the optimum processing domain has been found to lie approximately in the temperature range of 1260–1300 K and SR = 10–2.3–10–2 s−1, 1325–1373 K and SR = 10–1.4–10–1 s−1 &amp

1173–1193 K and SR = 10–1.3–10–1.55 s−1. Finally, the stable and unstable regimes in the processing maps are correlated with the microstructure of hot deformed samples. Graphical Abstract: [Figure not available: see fulltext.] © 2023, The Author(s) under exclusive licence to The Korean Institute of Metals and Materials.