Abstract
Inhomogeneous plastic deformation in AZ31 magnesium sheet has been studied during uniaxial tensile testing using digital image correlation and electron backscatter diffraction techniques. Large strain gradients develop on the sheet surface parallel and perpendicular to the loading direction while very little deformation occurs in the thickness direction. This lack of thinning leads to an abrupt fracture following the development of a premature but extensive diffuse neck but without any localized neck. The strain distribution on the sheet surface evolves nonlinearly with strain, impacting the measured plastic strain ratio, r-value. The results show that r-value should be measured at "points" rather than over the "gage length" in Mg alloys. Friction stir processing modifies the basal texture and thus significantly improves the forming limit for in-plane plane strain path. © 2012 Crown Copyright and Elsevier B.V.
Recommended Citation
J. Kang et al., "Effect of Inhomogeneous Deformation on Anisotropy of AZ31 Magnesium Sheet," Materials Science and Engineering: A, vol. 567, pp. 101 - 109, Elsevier, Jan 2013.
The definitive version is available at https://doi.org/10.1016/j.msea.2012.08.117
Department(s)
Materials Science and Engineering
Keywords and Phrases
Friction stir processing; Magnesium alloy; Necking; Plastic deformation; R-Value
International Standard Serial Number (ISSN)
0921-5093
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Elsevier, All rights reserved.
Publication Date
01 Jan 2013