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.

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

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Metallurgy Commons

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