摘要
The fatigue cracking behavior at twin boundaries(TBs)in a Co Cr Fe Mn Ni 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.
The fatigue cracking behavior at twin boundaries(TBs) in a Co Cr Fe Mn Ni 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.
基金
supported financially by the Australian Research Council(Nos.DE170100053 and DP190102243)
the Open Foundation of State Key Laboratory of Powder Metallurgy at Central South University
the National Natural Science Foundation of China(No.51771229)
The University of Sydney under the Robinson Fellowship Scheme.
作者简介
Corresponding author:X.H.An,E-mail addresses:xianghai.an@sydney.edu.au(X.H.An);Corresponding author:M.Song,E-mail addresses:msong@csu.edu.cn(M.Song);Corresponding author:X.Z.Liao,E-mail addresses:xiaozhou.liao@sydney.edu.au(X.Z.Liao).
