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Journal Article

Effect of grain size on fatigue cracking at twin boundaries in a CoCrFeMnNi high-entropy alloy

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Li,  Linlin
High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Institute of Metal Research, Chinese Academy of Science, Wenhua Road 72, Shenyang, 110016, China;

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Citation

Wang, A., An, X., Gu, J., Wang, X., Li, L., Li, W., et al. (2020). Effect of grain size on fatigue cracking at twin boundaries in a CoCrFeMnNi high-entropy alloy. Journal of Materials Science & Technology, 39, 1-6. doi:10.1016/j.jmst.2019.09.010.


Cite as: https://hdl.handle.net/21.11116/0000-0009-68DC-B
Abstract
The fatigue cracking behavior at twin boundaries (TBs) in a CoCrFeMnNi high-entropy alloy with three different grain sizes was systematically investigated under low-cycle fatigue. Irrespective of grain size, the change from slip band cracking to TB cracking occurred with increasing the difference in the Schmid factors (DSF) between matrix and twin. However, the required critical DSF for the transition of the dominant cracking mode decreases with decreasing grain size due to the reduced slip band spacing that increases the impingement sites on the TBs and facilitates the coalescence of defects and voids to initiate TB cracks. © 2019