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Local microstructure and micromechanical stress evolution during deformation twinning in hexagonal polycrystals

Published online by Cambridge University Press:  07 February 2020

Mariyappan Arul Kumar  and
Irene J. Beyerlein
Mariyappan Arul Kumar*
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
Irene J. Beyerlein
Affiliation:
Department of Mechanical Engineering, Materials Department, University of California at Santa Barbara, Santa Barbara, California 93106, USA
*
a)Address all correspondence to this author. e-mail: [email protected], [email protected]
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Abstract

Deformation twinning is a prevalent plastic deformation mode in hexagonal close-packed (HCP) materials, such as magnesium, titanium, and zirconium, and their alloys. Experimental observations indicate that these twins occur heterogeneously across the polycrystalline microstructure during deformation. Morphological and crystallographic distribution of twins in a deformed microstructure, or the so-called twinning microstructure, significantly controls material deformation behavior, ductility, formability, and failure response. Understanding the development of the twinning microstructure at the grain scale can benefit design efforts to optimize microstructures of HCP materials for specific high-performance structural applications. This article reviews recent research efforts that aim to relate the polycrystalline microstructure with the development of its twinning microstructure through knowledge of local stress fields, specifically local stresses produced by twins and at twin/grain–boundary intersections on the formation and thickening of twins, twin transmission across grain boundaries, twin–twin junction formation, and secondary twinning.

Type
REVIEW
Information
Journal of Materials Research , Volume 35 , Issue 3 , 14 February 2020 , pp. 217 - 241
Copyright
Copyright © Materials Research Society 2020

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This section of Journal of Materials Research is reserved for papers that are reviews of literature in a given area.

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