Loading…

On the conversion of plastic work to heat in Mg alloy AZ31B for dislocation slip and twinning deformation

•Crystal plasticity modeling used to solve for SCS specimen fitting parameters.•Twin-dominated plasticity has a lower conversion of plastic work to heat in AZ31B.•Slip-dominated plasticity has a higher conversion of plastic work to heat in AZ31B. In this study the conversion of plastic work to heat...

Full description

Saved in:
Bibliographic Details
Published in:Mechanics of materials 2019-07, Vol.134, p.176-184
Main Authors: Kingstedt, Owen T., Lloyd, Jeffrey T.
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Crystal plasticity modeling used to solve for SCS specimen fitting parameters.•Twin-dominated plasticity has a lower conversion of plastic work to heat in AZ31B.•Slip-dominated plasticity has a higher conversion of plastic work to heat in AZ31B. In this study the conversion of plastic work to heat of a hot-rolled magnesium alloy AZ31B is investigated using a mechanism-based approach. Shear-compression specimen loading orientations are selected to promote plastic deformation principally through either basal slip, combined pyramidal and prismatic slip, or extension twinning. Loading orientations were selected based on predictions from a crystal plasticity model. High strain-rate adiabatic deformation was accomplished using a compression Kolsky bar. During each experiment the deforming gauge section temperature rise is recorded using a single-point infra-red detector. From the specimen deformation, thermal measurements, and crystal plasticity calculations of mechanism activity, the conversion of plastic work to heat was inferred. Specimens where basal, prismatic, and pyramidal slip accounted for the majority of plastic deformation exhibited similar percentage of plastic work converted to heat. Specimens where extension twinning was highly active exhibited a comparatively lower fraction of plastic work converted to heat.
ISSN:0167-6636
1872-7743
DOI:10.1016/j.mechmat.2019.04.009