Effect of Microstructural Features on the High-Cycle Fatigue Behavior of CoCrFeMnNi High-Entropy Alloys Deformed at Room and Cryogenic Temperatures

다국어 초록 (Multilingual Abstract)

In this study, we examined the effect of deformation twins and dislocation cell structures on the fatigue properties of theCoCrFeMnNi high-entropy alloy using rotational bending fatigue tests. The dislocation cell structures and deformationtwins were generated by prestraining the CoCrFeMnNi high-entropy alloy at room temperature (27 °C) and a cryogenictemperature (− 196 °C), respectively. To eliminate the effect of different material strengths on fatigue behavior, the tensilestrengths of the specimens evaluated in the fatigue tests were kept similar by controlling the prestraining under room andcryogenic temperatures. The results of the rotational bending fatigue tests revealed that the CoCrFeMnNi high-entropyalloy prestrained at room temperature exhibited higher fatigue resistance and fatigue limit than the specimen prestrained ata cryogenic temperature. A small quantity of large micro-voids was formed at the triple junction of the grain boundaries inthe specimen prestrained at room temperature, whereas a large quantity of small micro-voids was formed in the region wherethe deformation twins intersected the grain boundaries in the specimen prestrained at a cryogenic temperature. Therefore,it is concluded that the different aspects of micro-void formation affected the crack initiation and, consequently, the fatigueproperties of the room and cryogenic temperature-prestrained alloys.

참고문헌 (Reference)

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