Nanoscale fluctuation of stacking fault energy strengthens multi-principal element alloys

Pei, Zongrui; Eisenbach, Markus; Liaw, Peter K.; Chen, Mingwei

doi:10.1016/j.jmst.2023.01.042

Nanoscale fluctuation of stacking fault energy strengthens multi-principal element alloys

Journal Article · Wed Mar 29 00:00:00 EDT 2023 · Journal of Materials Science and Technology

DOI:https://doi.org/10.1016/j.jmst.2023.01.042· OSTI ID:1972545

^[1]; ^[2]; Liaw, Peter K. ^[3]; Chen, Mingwei ^[4]

New York Univ. (NYU), NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Johns Hopkins Univ., Baltimore, MD (United States). Engineering and Hopkins Extreme Materials Institute

Chemical randomness and the associated energy fluctuation are essential features of multi-principal element alloys (MPEAs). Due to these features, nanoscale stacking fault energy (SFE) fluctuation is a natural and independent contribution to strengthening MPEAs. However, existing models for conventional alloys (i.e., alloys with one principal element) cannot be applied to MPEAs. The extreme values of SFEs required by such models are unknown for MPEAs, which need to calculate the nanoscale volume relevant to the SFE fluctuation. In the present work, we developed an analytic model to evaluate the strengthening effect through the SFE fluctuation, profuse in MPEAs. The model has no adjustable parameters, and all parameters can be determined from experiments and ab initio calculations. Further, this model explains available experimental observations and provides insightful guidance for designing new MPEAs based on the SFE fluctuation. It generally applies to MPEAs in random states and with chemical short-range order.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: National Science Foundation (NSF); US Army Research Office (ARO); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1972545

Alternate ID(s):: OSTI ID: 1970415

Journal Information:: Journal of Materials Science and Technology, Journal Name: Journal of Materials Science and Technology Journal Issue: 1 Vol. 158; ISSN 1005-0302

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
chemical short-range order
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References (53)

Figures / Tables (7)

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