The heterogeneity of mechanical response in gradient-structured CoCrNi alloy deformed upon quasi-static and dynamic compression

作者：Taifeng Cao, Shiyu Du, Zhouzhu Mao, Tuanwei Zhang, Jinyao Ma, Shengguo Ma, Aiguo Pi, Zhihua Wang · 发表于：Materials Research Letters · 年份：2025 · DOI：10.1080/21663831.2025.2563816 · 被引用次数：2 · 研究领域：Advanced materials and composites、High Entropy Alloys Studies、Metal and Thin Film Mechanics

Dynamic mechanical behavior and deformation mechanisms of gradient-structured (GS) materials represent a novel area of research, offering new opportunities for their application in dynamic impact scenarios. In this study, GS-CoCrNi medium-entropy alloys were synthesized, and compression experiments were conducted over a wide range of strain rates (from 10−4 /s to 103 /s). The significantly different strain rate sensitivities of the strengths observed at the edge and center regions result in markedly distinct macroscopic mechanical behaviors. Under quasi-static conditions, an upward concavity in the hardness increment (strength increment) is noted, whereas in the dynamic state, an opposite upward convexity is observed.