Trade-off between tensile property and formability by partial recrystallization of CrMnFeCoNi high-entropy alloy
Trade-off between tensile property and formability by partial recrystallization of CrMnFeCoNi high-entropy alloy
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DOI：
10.1016/j.msea.2017.07.079
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发表时间：
2017-08-04
期刊：
影响因子：
6.4
通讯作者：
Kim, Hyoung Seop
中科院分区：
文献类型：
--
作者：
Bae, Jae Wung;Moon, Jongun;Kim, Hyoung Seop
在这项工作中，高熵合金等原子的CrMnFeCoNi的真空感应熔炼，然后轧制处理。冷轧后，进行退火1小时，退火温度在650 ~ 1000 ℃之间变化。这样做是为了研究微观结构对拉伸性能和拉伸成形性（定义为材料在双轴拉伸下经受塑性变形的能力）的影响。部分再结晶的强化效果，与剩余的小部分的σ相颗粒，导致改善的屈服强度和拉伸强度，同时最大限度地减少了延展性的损失。完全再结晶的显微组织导致在拉伸试验期间延展性略有增加，并且强度显著降低。另一方面，拉伸成形性的结果表明，部分再结晶具有完全相反的结果。在这方面，目前的结果提出了一个新的问题，考虑利用部分再结晶的机械性能的改善。
In this work, a high-entropy alloy of equiatomic CrMnFeCoNi was processed by vacuum induction melting followed by rolling. After cold rolling, annealing for one hour was conducted during which the annealing temperature was varied from 650 to 1000 degrees C. This was done to investigate the effect of microstructure on tensile properties and stretch formability (defined as the capability of materials to undergo plastic.deformation under biaxial stretching). The strengthening effect of partial recrystallization, with a remaining small fraction of sigma phase particles, led to improved yield and tensile strengths while minimizing the loss of ductility. Fully recrystallized microstructure resulted in a slight increase in ductility, and a considerable decrease in strength, during a tensile test. On the other hand, the results for stretch formability suggest that partial recrystallization had exactly the opposite results. In this regard, the present results raise a new issue to consider when utilizing partial recrystallization for improvement of mechanical properties.