期刊
MATERIALS CHARACTERIZATION
卷 192, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2022.112193
关键词
Carbon nanotube; Metal matrix composite; Bimodal structure; Fatigue
类别
资金
- National Natural Science Foundation of China [51931009, 52192595, 51871215, 51871214]
- Liao Ning Revitalization Talents Program [XLYC1902058]
- Shenyang Young and Middle-Aged Scientific and Technological Innovation Talents Support Plan [RC210490]
- Youth Innovation Promotion Association CAS [2020197]
- China Scholarship Council
The study found that by constructing bimodal CNT/Al composites, the toughness and fatigue strength can be significantly improved, providing a new direction for applications in the aerospace field.
By introducing the ductile-zones (DZs) without carbon nanotubes (CNTs) into the brittle-zones (BZs) containing CNTs, constructing the bimodal structure, can effectively improve the toughness of CNT reinforced Al (CNT/Al) composites. However, to be applied in the field of aerospace, CNT/Al composites will be required to have high toughness, as well as high fatigue strength. At the present study, the fatigue behaviors of uniform and bimodal CNT/Al composites under the tension-compression state with the stress ratio of -1 were investigated. It was found that CNT rich zones could keep grains stable after the fatigue loading. However, for the bimodal CNT/Al composites, the preferential local deformation occurred in the DZs, which resulted in much lower fatigue strength as compared to the uniform composite. By reducing the grain size of DZs to ultra-fine grain (UFG) level, the large number of grain boundaries within the DZs hindered the directional movement of slip bands, which significantly enhanced the fatigue strength and achieved a higher toughness of bimodal CNT/Al composites. This discovery provides a new strategy for the preparation of high performance CNT/Al composites, and the bimodal CNT/Al composite with UFG DZs is expected to be applied in the aerospace field.
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