Decoupling between Shockley partials and stacking faults strengthens multiprincipal element alloys

Pei, Zongrui; Zhang, Siyuan; Lei, Yinkai; Zhang, Fan; Chen, Mingwei

doi:10.1073/pnas.2114167118

Title: Decoupling between Shockley partials and stacking faults strengthens multiprincipal element alloys

Journal Article · 15 December 2021 · Proceedings of the National Academy of Sciences of the United States of America

DOI: https://doi.org/10.1073/pnas.2114167118 · OSTI ID:1845749

^[1]; Zhang, Siyuan ^[2]; Lei, Yinkai ^[3]; Zhang, Fan ^[4]; Chen, Mingwei ^[5]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Max Planck Inst. fur Eisenforschung, Dusseldorf (Germany)
Univ. of Pittsburgh, PA (United States)
Tohoku Univ., Sendai (Japan)
Johns Hopkins Univ., Baltimore, MD (United States)

We report that mechanical properties are fundamental to structural materials, where dislocations play a decisive role in describing their mechanical behavior. Although the high-yield stresses of multiprincipal element alloys (MPEAs) have received extensive attention in the last decade, the relation between their mechanistic origins remains elusive. Our multiscale study of density functional theory, atomistic simulations, and high-resolution microscopy shows that the excellent mechanical properties of MPEAs have diverse origins. The strengthening effects through Shockley partials and stacking faults can be decoupled in MPEAs, breaking the conventional wisdom that low stacking fault energies are coupled with wide partial dislocations. This study clarifies the mechanistic origins for the strengthening effects, laying the foundation for physics-informed predictive models for materials design.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1845749

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 51 Vol. 118; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Decoupling between Shockley partials and stacking faults strengthens multiprincipal element alloys

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