Abstract

Cold rolled AZ31 magnesium alloy sheet was subjected to friction stir processing to generate four average grain sizes ranging from 0.8 to 9.6 μm. the processed material exhibited a strong basal fiber texture with the c-axis tilted about 35-55° towards the processing direction. the grain size and texture dependence of mechanical behavior were evaluated by using tensile testing along two orthogonal directions. Remarkably high ductility of ~65% was achieved in relatively coarse-grained material that fractured without developing necking when tested in the processing direction. the ductility decreased significantly to ~10% for ultrafine grained material as the tensile yield strength increased from ~53. MPa to ~180. MPa. Grain size had limited influence on ductility of processed material tested in transverse direction but reduced the uniform elongation to ~2% for ultrafine grained material which exhibited ~320. MPa yield strength. Accompanying the significant anisotropy in tensile strength in two directions, the deformation of processed AZ31 in the processing direction was mainly accommodated through basal slip and extension twinning (except for ultrafine grained material); however, the deformation of material in transverse direction was dominated by non-basal slip. Influences of grain size and texture on mechanical behavior were studied in terms of work-hardening and deformation mechanisms. © 2012 Elsevier B.V.

Department(s)

Materials Science and Engineering

Comments

National Science Foundation, Grant NSF-EEC-0531019

Keywords and Phrases

Deformation behavior; Friction stir processing; Grain refinement; Magnesium alloy; Texture

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

15 Dec 2012

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Metallurgy Commons

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