Development of Strong and Ductile Metastable Face-Centered Cubic Single-Phase High-Entropy Alloys

Wei, Daixiu; Li, Xiaoqing; Schönecker, Stephan; Jiang, Jing; Heng, Weicheng; Choi, Won-Mi; Lee, Byeong-Joo; Kim, Hyoung Seop; Chiba, Akihiko; Kato, Hidemi

doi:10.2139/ssrn.3416324

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“…As is known, the SFE of fcc-metals is a major factor governing the plastic deformation mechanism. The deformation mechanism switches from the dislocation slip to mechanical twinning and then to fcc → hcp (hexagonal close-packed) strain-induced martensitic transformation by gradually lowering the SFE [ 7 , 8 , 9 , 10 ]. A high SFE value (>45 mJ/m 2 ) results in a perfect dislocation slip, an intermediate SFE value (15–45 mJ/m 2 ) leads to the generation of mechanical twinning, and a low SFE value (<15 mJ/m 2 ) promotes the fcc → hcp transformation [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we revealed the principles for tuning the SFE of the Cantor HEA, assisted by a combination of thermodynamic calculations, ab initio calculations, and experiments [ 8 , 9 , 10 ]. The decrease in Mn, Ni, and Fe, as well as the increase in the Co and Cr concentrations reduces the SFE of the system and meanwhile increases the elastic modulus and friction stress for dislocation slip [ 8 , 9 , 10 ]. Following the guidelines, we designed a series of nonequiatomic corich strong and ductile HEAs.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Refinement of a Transformation-Induced Plasticity High-Entropy Alloy

Wei

Xie

et al. 2021

Materials

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High-entropy alloys (HEAs) have attracted extensive interest due to their unprecedented structure and mechanical performance. We recently proposed a series of novel corich twinning induced plasticity (TWIP) and transformation induced plasticity (TRIP) HEAs with superior tensile properties at room temperature; however, the hot deformation behavior has not been reported. Here, we investigated the dynamic recrystallization behavior and grain refinement of a representative TRIP-HEA, compressed at temperatures of 1123–1273 K with strain rates of 0.1–0.001 s−1. We characterized the impact of the temperature and strain rate on the grain structure evolution. A constitutive equation was constructed to reveal the correlations between the flow stress, strain rate, temperature, and strain. The apparent activation energy was estimated to be ~385.7 kJ/mol. The discontinuous dynamic recrystallization played an important role in the grain refinement, particularly at a relatively higher temperature and a lower strain rate, and the volume fraction and morphology of the recrystallized grains exhibited a strong dependency on the Zener–Hollomon parameter. The study provides guidelines for the grain refinement of HEAs through thermomechanical processing.

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