The effects of free surfaces on deformation twinning in HCP metals

Leu, Brandon; Arul Kumar, M.; Beyerlein, I. J.

doi:10.1016/j.mtla.2021.101124

Title: The effects of free surfaces on deformation twinning in HCP metals

Journal Article · Thu May 20 00:00:00 EDT 2021 · Materialia

DOI:https://doi.org/10.1016/j.mtla.2021.101124· OSTI ID:1785481

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Univ. of California, Santa Barbara, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Deformation twinning is a predominant mode of plastic deformation for hexagonal close packed metals, like Mg and Ti. The heterogenous microstructure and the local stresses associated with twinning play a key role in their mechanical response and fracture. Surface analyses, like electron microscopy, are frequently employed to spatially map microstructure and micromechanical fields in order to study twinning behavior. However, these measurements are inherently influenced by the vicinity of the free surface. In this work, an elasto-visco-plastic fast-Fourier-transform (EVP-FFT) polycrystal modeling approach is employed to investigate the effects of free surfaces on twin development before and after loading. We compare calculated micromechanical fields on free surfaces with those calculated inside the bulk and, in some cases, experimental surface measurements. The results indicate that the creation of free surfaces can promote twin propagation and growth and can influence twin morphology by causing a twin lamella to become larger, more blunted and irregular. The structure along the twin boundaries are also affected, due to the higher driving stresses that extend prismatic-basal and basal-prismatic facets. Furthermore, free surfaces invoke different slip activities in the twin and the surrounding parent crystal by enhancing basal, prismatic and pyramidal slip in some localized regions, while reducing slip in others. We demonstrate that the simulated free-surface effects lead to better qualitative and quantitative agreement with experimental measurements from scanning electron microscopy and digital image correlation.

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

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

Grant/Contract Number:: 89233218CNA000001; FWP-06SCPE401; CMMI-1728224

OSTI ID:: 1785481

Report Number(s):: LA-UR-21-20284

Journal Information:: Materialia, Vol. 17; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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