Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 113, Issue -, Pages 82-89Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2021.09.063
Keywords
Cu-Al alloy; Grain boundary engineering; Fatigue life; Crack nucleation; Stress amplitude
Funding
- National Natural Science Foundation of China (NSFC) [51871048, 52171108]
- Fundamental Research Funds for the Central Universities [N2002014]
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Grain boundary engineering (GBE) can effectively improve the low-cycle fatigue life of Cu-16 at.%Al alloys by suppressing cyclic strain localization and grain boundary cracking.
To probe a pathway to improve the low-cycle fatigue life of face-centered cubic (FCC) metals via grain boundary engineering (GBE), the tension-tension fatigue tests were carried out on the non-GBE and GBE Cu-16 at.%Al alloys at relatively high stress amplitudes. The results indicate that the cyclic strain localization and cracking at grain boundaries (GBs) can be effectively suppressed, especially at increased stress amplitude, by an appropriate GBE treatment that can result in a higher resistance to GB cracking and a greater capability of compatible deformation. Therefore, the sensitivity of fatigue life to stress amplitude can be weakened by GBE, and the low-cycle fatigue life of Cu-16 at.%Al alloys is thus distinctly improved. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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