The role of twinning deformation on the hardening response of polycrystalline magnesium from discrete dislocation dynamics simulations

Fan, Haidong; Aubry, Sylvie; Arsenlis, Athanasios; El-Awady, Jaafar A.

doi:10.1016/j.actamat.2015.03.039

The role of twinning deformation on the hardening response of polycrystalline magnesium from discrete dislocation dynamics simulations

Journal Article · Mon Apr 13 00:00:00 EDT 2015 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2015.03.039· OSTI ID:1257301

Fan, Haidong ^[1]; Aubry, Sylvie ^[2]; Arsenlis, Athanasios ^[2]; El-Awady, Jaafar A. ^[3]

Sichuan Univ., Chengdu (China); Johns Hopkins Univ., Baltimore, MD (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Johns Hopkins Univ., Baltimore, MD (United States)

The mechanical response of micro-twinned polycrystalline magnesium was studied through three-dimensional discrete dislocation dynamics (DDD). A systematic interaction model between dislocations and (1012) tension twin boundaries (TBs) was proposed and introduced into the DDD framework. In addition, a nominal grain boundary (GB) model agreeing with experimental results was also introduced to mimic the GB’s barrier effect. The current simulation results show that TBs act as a strong obstacle to gliding dislocations, which contributes significantly to the hardening behavior of magnesium. On the other hand, the deformation accommodated by twinning plays a softening role. Therefore, the concave shape of the Mg stress-strain curve results from the competition between dislocation-TB induced hardening and twinning deformation induced softening. At low strain levels, twinning deformation induced softening dominates and a decreasing hardening rate is observed in Stage-I. In Stage-II, both the hardening and softening effects decline, but twinning deformation induced softening declines faster, which leads to an increasing hardening rate.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1257301

Alternate ID(s):: OSTI ID: 1251472
OSTI ID: 1258551

Report Number(s):: LLNL--JRNL-694178; LLNL-JRNL--694163

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 92; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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