Effect of twin crystallographic orientation on deformation and growth in Mg alloy AZ31
File(s)
Accepted version
Author(s)
Paramatmuni, Chaitanya
Dunne, Fionn PE
Type
Journal Article
Abstract
In this study we present an integrated experimental and computational study of the effect of twin crystallographic orientation on local deformation characteristics that govern its subsequent growth. Experimentally measured intra-twin geometrically necessary dislocations (GND) density and twin-resolved shear stress (TRSS) differences within twins are found to vary with twin crystallographic orientation, which is characterised in terms of inclination angle (that between the loading direction and twin c-axis). Shear transformation modelling of four particular twins with increasing inclination angle shows that the latter dominates both slip and TRSS within the twin. Model predictions and experimental measurements show that intra-twin average GND density increases with inclination angle, and that a reversal in the sign of intra-twin TRSS occurs as the inclination angle increases. This implies that the TRSS (backstress) within a twin is not always negative, which further suggests that the rate of twin growth is influenced by its own crystallographic orientation instead of global Schmid factor (which is based on parent grain orientation).
Date Issued
2020-12
Date Acceptance
2020-04-27
Citation
International Journal of Plasticity, 2020, 135
ISSN
0749-6419
Publisher
Elsevier
Journal / Book Title
International Journal of Plasticity
Volume
135
Copyright Statement
Copyright © Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000583416400003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
Subjects
Crystal plasticity
CRYSTAL PLASTICITY
Deformation twinning
DISLOCATION DENSITY
ELECTRON BACKSCATTER DIFFRACTION
Engineering
Engineering, Mechanical
FATIGUE
Geometrically necessary dislocations
HCP
MAGNESIUM ALLOY
Materials Science
Materials Science, Multidisciplinary
Mechanics
PART 2
Science & Technology
SLIP SYSTEM
STRAIN-RATE SENSITIVITY
STRESS-FIELDS
Technology
Twin orientations
Twin resolved shear stress
Publication Status
Published
Article Number
102775
Date Publish Online
2020-06-03