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Title: A prediction model for the failure threshold in a CoNiV medium-entropy alloy
Portevin–Le Chatelier effect, associated with dynamic strain aging, is widely found in various alloys, and the maximum serration magnitude from the tensile stress–strain curve can be considered as the point closest to the failure threshold. Due to the difficulty to define solute and solvent atoms in multicomponent alloys, it is a great challenge to explore the serration mechanism. In this study, the atoms that play the role of pinning are defined as solute atoms. Aided by mean-field theory, an in situ pinning model coupled with the twinning effect in a CoNiV alloy with low stacking fault energies is successfully established, which can well predict the failure threshold, i.e., the maximum serration magnitude. The present study paves a new way to correlate the serration dynamics and in situ pinning, and further predicts the failure threshold upon loading for multicomponent high- and medium-entropy alloys.  more » « less
Award ID(s):
1809640
PAR ID:
10553120
Author(s) / Creator(s):
; ; ; ; ;
Publisher / Repository:
AIP
Date Published:
Journal Name:
Journal of Applied Physics
Volume:
134
Issue:
13
ISSN:
0021-8979
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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