The role of twinning deformation on the hardening response of polycrystalline magnesium from discrete dislocation dynamics simulations
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1257301
- Alternate Identifier(s):
- OSTI ID: 1251472; OSTI ID: 1258551
- Report Number(s):
- LLNL-JRNL-694178; LLNL-JRNL-694163
Journal ID: ISSN 1359-6454
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 92; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Fan, Haidong, Aubry, Sylvie, Arsenlis, Athanasios, and El-Awady, Jaafar A. The role of twinning deformation on the hardening response of polycrystalline magnesium from discrete dislocation dynamics simulations. United States: N. p., 2015.
Web. doi:10.1016/j.actamat.2015.03.039.
Fan, Haidong, Aubry, Sylvie, Arsenlis, Athanasios, & El-Awady, Jaafar A. The role of twinning deformation on the hardening response of polycrystalline magnesium from discrete dislocation dynamics simulations. United States. https://doi.org/10.1016/j.actamat.2015.03.039
Fan, Haidong, Aubry, Sylvie, Arsenlis, Athanasios, and El-Awady, Jaafar A. Mon .
"The role of twinning deformation on the hardening response of polycrystalline magnesium from discrete dislocation dynamics simulations". United States. https://doi.org/10.1016/j.actamat.2015.03.039. https://www.osti.gov/servlets/purl/1257301.
@article{osti_1257301,
title = {The role of twinning deformation on the hardening response of polycrystalline magnesium from discrete dislocation dynamics simulations},
author = {Fan, Haidong and Aubry, Sylvie and Arsenlis, Athanasios and El-Awady, Jaafar A.},
abstractNote = {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.},
doi = {10.1016/j.actamat.2015.03.039},
journal = {Acta Materialia},
number = ,
volume = 92,
place = {United States},
year = {Mon Apr 13 00:00:00 EDT 2015},
month = {Mon Apr 13 00:00:00 EDT 2015}
}
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