Evolution of microstructure and texture in Al-containing CoCrNi medium entropy alloys during severe warm-rolling

J. Saha; P. V. Cobbinah; T. Hiroto; S. Matsunaga; Y. Toda; Y. Yamabe-Mitarai

doi:10.1016/j.matchar.2023.113546

Article Evolution of microstructure and texture in Al-containing CoCrNi medium entropy alloys during severe warm-rolling

J. Saha (Department of Advanced Materials Science, The University of Tokyo) ; P. V. Cobbinah (Department of Advanced Materials Science, The University of Tokyo) ; T. Hiroto (National Institute for Materials Science) ; S. Matsunaga (Department of Advanced Materials Science, The University of Tokyo) ; Y. Toda (National Institute for Materials Science) ; Y. Yamabe-Mitarai (Department of Advanced Materials Science, The University of Tokyo)

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J. Saha, P. V. Cobbinah, T. Hiroto, S. Matsunaga, Y. Toda, Y. Yamabe-Mitarai. Evolution of microstructure and texture in Al-containing CoCrNi medium entropy alloys during severe warm-rolling. MATERIALS CHARACTERIZATION. 2023, 207 (), 113546-113546. https://doi.org/10.1016/j.matchar.2023.113546

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Al as an alloying element could influence the properties of the single-phase equiatomic CoCrNi MEA and to understand the effect of Al, different alloys were prepared with the different Al concentrations to CoCrNi MEA (AlxCoCrNi). The alloys were warm-rolled at 400 °C up to a thickness reduction of 85% and followed by isochronal annealing at 700-1100 °C. The microstructure after deformation revealed the development of deformation heterogeneities such as shear bands and deformation nano-twins. The evolution of the weak brass component was seen after deformation. Different phases, such as BCC and sigma phases evolved upon annealing treatment at different temperatures. Higher Al-content MEA (Al9.09) showed comparatively finer recrystallized microstructure irrespective of the annealing temperatures. The weak recrystallization texture was developed after annealing and the deformation texture components, lying on α-fiber, were preserved. These indicated the absence of preferential nucleation and growth during annealing. The hardness in the as-cast, deformed, and annealed conditions increased with the increase of the Al-content, indicating the influence of Al in the strengthening of the AlxCoCrNi MEAs.

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