Journal
MATERIALS LETTERS
Volume 277, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2020.128289
Keywords
Friction stir processing; Ultrafine-grained Al; Metals and alloys; Microstructure; Fatigue
Funding
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2017236]
- National Natural Science Foundation of China [U1760201]
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Ultrafine-grained (UFG) pure Al with uniform and stable microstructure produced by friction stir processing (FSP) significantly increased the high-cycle fatigue (HCF) strength compared with coarse-grained and other UFG materials prepared by severe plastic deformation (SPD). There was no obvious surface damage for FSP-UFG pure Al and the improved fatigue damage resistance can be attributed to the uniform microstructure and high microstructural stability. The ring-island stress distribution of FSP-UFG impeded the formation of large-scale shear bands, and enhanced the coordinated deformation during cyclic deformation. In addition to the enhanced tensile strength, increasing the fatigue strength exponent, which is decided by the microstructural stability, is also an effective method of improving the fatigue strength. (C) 2020 Elsevier B.V. All rights reserved.
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