Journal
ACTA MATERIALIA
Volume 59, Issue 13, Pages 5358-5367Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.05.013
Keywords
Ultrafine grained microstructure; Cryo-rolling; Fatigue; Low-cycle fatigue; Shear bands
Funding
- Australian Research Council
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The cyclic deformation response of ultrafine pure Al produced by cryo-rolling was investigated using low-cycle fatigue and electron microscopy. The ultrafine pure Al was cyclically deformed under a fully reversed total strain control (R = -1) corresponding to a plastic strain amplitude range of 8 x 10(-4) and 1.4 x 10(-2). It was found that cryo-rolled pure Al is very susceptible to cyclic softening, resulting in a much lower fatigue life compared with the coarse-grained counterpart. Shear banding and associated grain coarsening were the most prominent microstructural features of the cyclically deformed cryo-rolled pure Al. Furthermore, annealing led to a slight decrease in the cyclic softening rate, giving a slight increase in the fatigue life of cryo-rolled Al. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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