Grain elongation and anisotropic grain growth during superplastic deformation in an Al-Mg-Mn-Cu alloy

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(97)00032-3· OSTI ID:540964

Li, F; Bae, D H; Ghosh, A K ^[1]

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1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering

Evolution of grain morphology in a fine grained Al-Mg-Mn-Cu alloy during uniaxial superplastic deformation is studied quantitatively. Grains undergo elongation, as well as dynamic grain growth along all directions, the separation and analysis of which is attempted here. Based on such analysis, the computed true grain growth rate along directions transverse to the tensile axis are found to exceed that parallel to the tensile axis. Possible mechanisms for this new observation are suggested. A unique relationship between grain boundary sliding rate and dynamic grain growth rate is found at different applied strain rates; this indicates that grain boundary sliding and grain boundary migration rates are inherently connected through the same mechanism.

• OSTI ID: 540964
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 9 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ANISOTROPY
COPPER ALLOYS
DEFORMATION
ELONGATION
GRAIN BOUNDARIES
GRAIN GROWTH
MAGNESIUM ALLOYS
MANGANESE ALLOYS
MICROSTRUCTURE
MORPHOLOGY
STRAIN RATE