Twinning pathways enabled by precipitates in $\mathrm{AZ91}$

Leu, Brandon; Kumar, Mariyappan Arul; Xie, Kelvin Y.; Beyerlein, Irene J.

doi:10.1016/j.mtla.2021.101292

Title: Twinning pathways enabled by precipitates in $$\mathrm{AZ91}$$

Journal Article · Thu Dec 02 00:00:00 EST 2021 · Materialia

DOI:https://doi.org/10.1016/j.mtla.2021.101292· OSTI ID:1922770

Leu, Brandon ^[1];

^[2]; Xie, Kelvin Y. ^[3]; Beyerlein, Irene J. ^[1]

University of California, Santa Barbara, CA (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Texas A & M University, College Station, TX (United States)

While precipitates have been shown to substantially strengthen magnesium alloys by blocking the glide of dislocations inside the grain, the interactions between these precipitates and deformation twins, which commonly occur in these alloys, are much less understood. Here, in this work, an elasto-viscoplastic fast-Fourier-transform (EVP-FFT) model is used to study the interactions between plate-shaped basal precipitates and propagating $$10\bar{1}2$$ tensile twins in AZ91 Mg alloy. The results suggest that while precipitates may impede the propagation and thickening of twins, they can also cause stress localizations that can promote the formation of multiple new twins of the same or different crystallographic variants. We show that the location of the twin-precipitate interaction site, whether precipitate-central or precipitate-edge impingement, and the thickness of the precipitate can influence the propensity for twins to expand around the precipitate or nucleate a new twin on the other side of it. Depending on the twin-precipitate impingement site, we propose multiple twinning pathways that can help explain how twins can proliferate in the magnesium alloys in the presence of precipitates.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC). Office of Basic Energy Sciences (BES); Department of Defense (DoD); National Science Foundation (NSF)

Grant/Contract Number:: 89233218CNA000001; FWP-06SCPE401; CMMI-1729887

OSTI ID:: 1922770

Report Number(s):: LA-UR-21-30227

Journal Information:: Materialia, Vol. 21; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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