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Characterization of deformation processes in a Zn-22% Al Alloy using atomic force microscopy

Huang, Y. and Langdon, T.G. (2002) Characterization of deformation processes in a Zn-22% Al Alloy using atomic force microscopy Journal of Materials Science, 37, (23), pp. 4993-4998. (doi:10.1023/A:1021071228521).

Record type: Article


The Zn-22% Al eutectoid alloy was subjected to equal-channel angular pressing at a temperature of 473 K to give an as-pressed grain size of ~1.3 ?m. Subsequent tensile testing of the as-pressed alloy at room temperature revealed a transition from deformation by a dislocation mechanism at the higher strain rates to superplastic flow at strain rates below ~5 × 10–3 s–1: this corresponds to the transition from region III to region II in conventional superplasticity. Samples were pulled to relatively low total strains, of the order of ~0.2–0.5, and the surface topography was then examined using an atomic force microscope (AFM). The AFM observations confirm the transition in deformation mechanisms with decreasing strain rate and they provide direct evidence for the occurrence of grain boundary sliding within the superplastic regime.

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Published date: 2002


Local EPrints ID: 23471
ISSN: 0022-2461
PURE UUID: 1d63fd4e-d661-4103-9380-5e8fb87c9971
ORCID for Y. Huang: ORCID iD
ORCID for T.G. Langdon: ORCID iD

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Date deposited: 24 Mar 2006
Last modified: 17 Jul 2017 16:17

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