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Abstract：
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In order to improve the mechanical properties of high entropy alloy (Fe50Ni30Co10Cr10) with non-equal atomic ratio, B element was added to the alloy as a clearance enhancement atom. After the deformation treatment and annealing, the precise control of the alloy microstructure was realized, and the recrystallization transformation processes of the alloy after annealing at different times and temperatures were analyzed. The results show that the addition of B element to FeCoCrNi high entropy alloy causes a small drop in the temperature of σ phase, and with the gradual decreasing of the temperature, Cr5B3 phase is formed at 574 ℃. Furthermore, the as-cast sample contains two phase structures with the fcc matrix phase and the Cr5B3 second phase. In the state of small deformation, the grain shape is mainly dendritic, and the intragranular structure slips to form the obvious step shape. After the deformation reaches 50%, the grains are obvious elongated to form the deformation structure of the twisted band, and the dendritic structure gradually changes into a flat structure. With the increasing of deformation amount, the grain size gradually decreases, and the grains are obviously refined. When the annealing time reaches 30 min, the grain size formed is significantly different from the grain size annealed at the annealing time of 10 min without the condition of grain growth, and a large number of hcp lath structures are also formed in the equiaxed grains.
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Funds：
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河南省科技攻关计划项目（142102310526）；河南省教育厅项目（201706207)
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AuthorIntro：
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作者简介：刘世平（1979-），男，硕士，讲师，E-mail：liushiping79@163.com
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Reference：
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