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Cyclic deformation response of ultrafine pure Al

Authors
Journal
Acta Materialia
1359-6454
Publisher
Elsevier
Publication Date
Volume
59
Issue
13
Identifiers
DOI: 10.1016/j.actamat.2011.05.013
Keywords
  • Ultrafine Grained Microstructure
  • Cryo-Rolling
  • Fatigue
  • Low-Cycle Fatigue
  • Shear Bands

Abstract

Abstract 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 × 10 −4 and 1.4 × 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.

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