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Indentation Strain Rate Sensitivity of CoCrFeNiAl 0.3 High‐Entropy Alloy
Author(s) -
Qiu Ji,
Xiao Gesheng,
Jin Tao,
Su Buyun,
Shu Xuefeng,
Ma Shengguo
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800744
Subject(s) - indentation , materials science , nanoindentation , strain rate , indentation hardness , composite material , knoop hardness test , elastic modulus , alloy , nucleation , microstructure , thermodynamics , physics
In this paper, the mechanical properties of CoCrFeNiAl 0.3 high‐entropy alloy (HEA) under different strain rates are investigated using nanoindentation at room temperature. Experimental results show that the contact stiffness increases almost linearly with indentation depth and the elastic modulus is invariable under different indentation strain rates, while the indentation hardness under higher strain rate is relatively larger, and the hardness under large indentation depth is relatively smaller for each indentation strain rate. The indentation size effect of hardness and strain rate sensitivity exponent m under different indentation strain rates are analyzed, then the hardness and m free from the effect of indentation depth are obtained. Finally, this investigation reveals the size effects of the hardness of HEA in light of the strain rate sensitivity and activation volume of the dislocation nucleation.