Interface Facilitated Reorientation of Mg Nanolayers in Mg-Nb Nanolaminates

Y. Chen, M. Y. Gong, S. Shao, N. A. Mara, J. Wang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Mg/Nb nanolaminates synthesized through vapor deposition techniques exhibit high flow strength without conventional twinning in Mg. In this work, we investigated the influence of laminated microstructures on deformation mechanisms of Mg nanolayers. Using molecular dynamics simulations, we explored that (0001)-oriented Mg layers transform or re-orient to {101 ¯ 0}-oriented Mg layers through nucleation and growth of {101 ¯ 2} twins by atomic shuffling, instead of conventional {101 ¯ 2} twinning shear. Such a reorientation accommodates in-plane compressive strain and out-of-plane tensile strain when Mg/Nb laminates are subjected to compression parallel to the Mg/Nb interfaces. The nucleation of {101 ¯ 2} twins is promoted at the Mg/Nb interface due to the structural change associated with the glide of interface dislocations. The growth of {101 ¯ 2} twins is accomplished through migration of basal–prismatic boundaries via nucleation and glide of one-layer and two-layer disconnections associated with atomic shuffling. The results shed light on improving mechanical properties of hexagonal close-packed metals employing laminated structures.

Original languageEnglish (US)
Pages (from-to)1215-1220
Number of pages6
JournalJOM
Volume71
Issue number4
DOIs
StatePublished - Apr 15 2019

Bibliographical note

Funding Information:
This work was supported by the Nebraska Center for Energy Sciences Research which is a collabora- tion between the Nebraska Public Power District (NPPD) and the University of Nebraska-Lincoln (UNL).

Publisher Copyright:
© 2019, The Minerals, Metals & Materials Society.

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

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