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

Lee Gyung Tae; Won Jong Woo; Lim Ka Ram; Kang Minju; Kwon Heoun Jun; Na Young Sang; Choi Yoon Suk

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

机译：微观结构特征对房间和低温温度变形的COCRFEMNNI高熵合金的高循环疲劳行为

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In this study, we examined the effect of deformation twins and dislocation cell structures on the fatigue properties of the CoCrFeMnNi high-entropy alloy using rotational bending fatigue tests. The dislocation cell structures and deformation twins were generated by prestraining the CoCrFeMnNi high-entropy alloy at room temperature (27 degrees C) and a cryogenic temperature (- 196 degrees C), respectively. To eliminate the effect of different material strengths on fatigue behavior, the tensile strengths of the specimens evaluated in the fatigue tests were kept similar by controlling the prestraining under room and cryogenic temperatures. The results of the rotational bending fatigue tests revealed that the CoCrFeMnNi high-entropy alloy prestrained at room temperature exhibited higher fatigue resistance and fatigue limit than the specimen prestrained at a cryogenic temperature. A small quantity of large micro-voids was formed at the triple junction of the grain boundaries in the specimen prestrained at room temperature, whereas a large quantity of small micro-voids was formed in the region where the 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 fatigue properties of the room and cryogenic temperature-prestrained alloys.

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来源
《Metals and Materials International》 |2021年第4期|共10页
作者
Lee Gyung Tae; Won Jong Woo; Lim Ka Ram; Kang Minju; Kwon Heoun Jun; Na Young Sang; Choi Yoon Suk;
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作者单位

Korea Inst Mat Sci Adv Met Div Chang Won 51508 South Korea;

Korea Inst Mat Sci Adv Met Div Chang Won 51508 South Korea;

Korea Inst Mat Sci Adv Met Div Chang Won 51508 South Korea;

Johns Hopkins Univ Hopkins Extreme Mat Inst Baltimore MD 21218 USA;

Korea Inst Mat Sci Adv Met Div Chang Won 51508 South Korea;

Korea Inst Mat Sci Adv Met Div Chang Won 51508 South Korea;

Pusan Natl Univ Sch Mat Sci &

Engn Busan 46241 South Korea;

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原文格式 PDF
正文语种 eng
中图分类金属材料;
关键词
High-entropy alloy; CoCrFeMnNi; Deformation twin; Dislocation cell structure; High cycle fatigue;

机译：高熵合金;COCRFEMNNI;变形双胞胎;位错细胞结构;高周期疲劳;
入库时间 2022-08-20 18:22:34

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

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