Thermally activated deformation and the rate controlling mechanism in CoCrFeMnNi high entropy alloy

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• 作者：Sun Ig Hong^a ; ^{sihong@cnu.ac.kr} ; Jongun Moon^b ; Soon Ku Hong^a ; Hyoung Seop Kim^b ; ^{hskim@postech.ac.kr}
• 关键词：Thermally activated processes ; Mechanical properties ; Dislocation ; High entropy alloy ; Activation volume
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：13 January 2017
• 年：2017
• 卷：682
• 期：Complete
• 页码：569-576
• 全文大小：646 K
• 卷排序：682

文摘

The nature of obstacles to dislocation motion in CoCrFeMnNi alloy was analyzed using the thermally activated deformation analyses at low temperatures. The strong temperature dependence of yield stress and small activation volume in CoCrFeMnNi favor the dislocation glide over the obstacles with high friction stress. The activation volume of CoCrFeMnNi alloy (10–100 b3) in this study is much smaller than those of conventional FCC metals (102~103 b3), but close to those observed in BCC metals (8–100 b3) and HCP metals (5–100 b3). The increase of the activation volume with strain supports overcoming the nanoscale inhomogeneity such as co-clusters and/or short range orders as the rate controlling mechanism. The transition of dislocation structure from planar array to cell structure at 20% strain in CoCrFeMnNi reported in the literature can be attributed to the prevalent shearing of nanoscale inhomogeneity with strain.