On the strain rate-dependent deformation mechanism of CoCrFeMnNi high-entropy alloy at liquid nitrogen temperature

In the present work, the deformation mechanisms of the CoCrFeMnNi high-entropy alloy at 77 K were investigated using thermal activation analyses. The strain rate jump test was performed to estimate strain rate sensitivity and the activation volume of the alloy. Transmission electron microscopy analy...

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Bibliographic Details
Published inMaterials research letters Vol. 5; no. 7; pp. 472 - 477
Main Authors Moon, Jongun, Hong, Sun Ig, Bae, Jae Wung, Jang, Min Ji, Yim, Dami, Kim, Hyoung Seop
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 03.11.2017
Subjects
High-entropy alloy
strain rate sensitivity
thermally activated process
transmission electron microscopy
twinning
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Summary:In the present work, the deformation mechanisms of the CoCrFeMnNi high-entropy alloy at 77 K were investigated using thermal activation analyses. The strain rate jump test was performed to estimate strain rate sensitivity and the activation volume of the alloy. Transmission electron microscopy analyses were performed to identify the evolution of twins at low temperatures. The insensitivity of activation volume to strain observed in the CoCrFeMnNi alloy at 77 K was different from the observed increase in the activation volume with strain at room temperature, which occurred due to the shearing of nanoscale inhomogeneities, such as co-clusters and short-range orders.
ISSN:2166-3831
2166-3831
DOI:10.1080/21663831.2017.1323807