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Hot compression behaviors and microstructure evolutions of a cast dual-phase NiCoFeCrAl0.7 high-entropy alloy
Intermetallics ( IF 4.4 ) Pub Date : 2021-08-14 , DOI: 10.1016/j.intermet.2021.107314
Qiang Wang 1, 2 , Tengfei Gao 3 , Hui Du 1, 2 , Qiang Hu 4 , Qiang Chen 5 , Zitian Fan 3 , Liangcai Zeng 1, 2 , Xinwang Liu 3
Affiliation  

Hot compression behaviors and microstructure evolutions of a cast dual-phase NiCoFeCrAl0.7 high-entropy alloy (HEA) consisting of 79.2 vol% face-centered-cubic (FCC) plus 20.8 vol% body-centered-cubic (BCC) phases were investigated under various parameters. Dynamic recrystallization (DRX) dominated the flow softening behavior, strongly depending on the hot compression parameters. The constitutive equation describing the correlations between the flow stress and hot compression parameters was constructed, and the activation energy of the dual-phase HEA was significantly improved up to approximately 379.81 kJ/mol. The curves of Xdrx (volume fraction of DRX grains) against the strain exhibits a “C” shape. Continuous dynamic recrystallization (CDRX) governed the flow softening, which was preferred in the FCC phase. With the proceeding of hot compression, the substructure within the deformed microstructure evolved in a sequence from the disordered dislocations, cellular structure, subgrain to DRX grains.



中文翻译:

铸造双相 NiCoFeCrAl0.7 高熵合金的热压缩行为和组织演变

研究了由 79.2 vol% 面心立方 (FCC) 和 20.8 vol% 体心立方 (BCC) 相组成的铸造双相 NiCoFeCrAl 0.7高熵合金 (HEA) 的热压缩行为和微观结构演变各种参数。动态再结晶 (DRX) 主导了流动软化行为,强烈依赖于热压缩参数。构建了描述流动应力与热压缩参数之间相关性的本构方程,双相 HEA 的活化能显着提高至约 379.81 kJ/mol。X drx(DRX 晶粒的体积分数)对应变的曲线表现出“ C“ 形状。连续动态再结晶 (CDRX) 控制流动软化,这在 FCC 相中是优选的。随着热压缩的进行,变形组织内的亚结构由无序位错、胞状结构、亚晶粒到DRX晶粒依次演化。

更新日期:2021-08-15
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