期刊
ACTA MATERIALIA
卷 74, 期 -, 页码 96-109出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.04.027
关键词
Dynamic precipitation; Cyclic deformation; Fatigue; 7xxx; Small-angle X-ray scattering
资金
- Australian Research Council (ARC) through the Centre of Excellence for Design in Light Metals
- ARC through the award of a Future Fellowship
- European Research Council
The room temperature cyclic deformation behaviour of an Al-Zn-Mg-(Cu) alloy was examined in the under-aged and peak-aged states. The tests were performed under constant plastic strain amplitude loading in tension compression mode, and the effect of cumulative strain (number of cycles), strain rate and plastic strain amplitude was examined. Pronounced cyclic hardening was observed in the under-aged states, and characterization of the microstructure using small-angle X-ray scattering illustrated that this was due to profuse dynamic precipitation at room temperature during cycling. Regardless of deformation conditions, the radius of the dynamically formed GP zones remained constant at 4-5 angstrom, and only the volume fraction of the zones increased during cycling. The strain, strain rate and plastic strain amplitude dependence of the evolution of the volume fraction of zones forming dynamically was interpreted in terms of a nucleation-dominated reaction, and it is shown that the behaviour can be satisfactorily rationalized when the role of strain-induced vacancies is considered. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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