Journal
SCRIPTA MATERIALIA
Volume 166, Issue -, Pages 10-14Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.02.040
Keywords
Friction stir processing; Ultrafine-grained Cu; Cyclic softening; Stable microstructures; Low-cycle fatigue life
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Funding
- National Natural Science Foundation of China [51301178, 51331008]
- Australian Research Council [DE170100053]
- Robinson Fellowship of the University of Sydney
- Australian Research Council [DE170100053] Funding Source: Australian Research Council
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We report that the uniform and stable microstructure essentially ameliorate the cyclic softening of the ultrafine-grained (UFG) Cu prepared by friction stir processing (FSP) and then enhance its low-cycle fatigue properties. In lieu of the fatigue-induced grain coarsening, dislocation and grain boundary (GB) activities play crucial roles in accommodating the cyclic plasticity. In addition, the protrusion and small cracks near the GB regions rather than shear bands are main surface damage morphologies that lead to its final fatigue failure. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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