Atomistic insights into metal hardening

Zepeda-Ruiz, Luis A.; Stukowski, Alexander; Oppelstrup, Tomas; Bertin, Nicolas; Barton, Nathan R.; Freitas, Rodrigo; Bulatov, Vasily V.

doi:10.1038/s41563-020-00815-1

Atomistic insights into metal hardening

Journal Article · Mon Oct 05 00:00:00 EDT 2020 · Nature Materials

DOI:https://doi.org/10.1038/s41563-020-00815-1· OSTI ID:1769150

Zepeda-Ruiz, Luis A. ^[1]; ^[2]; Oppelstrup, Tomas ^[1]; Bertin, Nicolas ^[1]; ^[1]; ^[3]; ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Technical Univ. of Darmstadt (Germany)
Stanford Univ., CA (United States); Univ. of California, Berkeley, CA (United States)

For thousands of years, humans have exploited the natural property of metals to get stronger or harden when mechanically deformed. Ultimately rooted in the motion of dislocations, mechanisms of metal hardening have remained in the cross-hairs of physical metallurgists for over a century. Here, we performed atomistic simulations at the limits of supercomputing that are sufficiently large to be statistically representative of macroscopic crystal plasticity yet fully resolved to examine the origins of metal hardening at its most fundamental level of atomic motion. We demonstrate that the notorious staged (inflection) hardening of metals is a direct consequence of crystal rotation under uniaxial straining. At odds with widely divergent and contradictory views in the literature, we observe that basic mechanisms of dislocation behaviour are the same across all stages of metal hardening.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1769150

Report Number(s):: LLNL-JRNL--800379; 1003907

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 3 Vol. 20; ISSN 1476-1122

Publisher:: Springer Nature - Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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