Journal
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
Volume 101, Issue -, Pages 29-37Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2015.07.019
Keywords
Metal matrix composites (MMCs); Strain gradient; Grain size; Mechanical response
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Funding
- Chinese Ministry of Education [211061]
- National Natural Science Foundation of China [10502025, 10872087, 11272143]
- Program for Chinese New Century Excellent Talents in university [NCET-12-0712]
- Ph.D. Programs Foundation of Ministry of Education of China [20133221110008]
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The mechanical responses of carbon nanotube (CNT) reinforced nano/ultrafine-grained metal matrix composites (MMCs) with the reinforcement located at grain boundaries and atomically disordered regions near the reinforcement have not been discussed yet. Here a theoretical model based on dislocation-controlling constitutive relations of metal matrix and strain gradient effect is adopted to quantitatively understand the contributions of strengthening mechanisms to the mechanical response of these composites. CNT-reinforced nano/ultrafine-grained MMCs will be treated as a two-phase composite with CNT-free regions surrounded by CNT-containing domains, whose mechanical behaviors are different from that of the matrix-only regions. The predictions of this model are in excellent agreement with available experimental results. During the process of deformation, geometrically necessary dislocations induced by strain gradient and thermal mismatch are limited within CNT-containing domains, and the thicknesses of these regions are obtained to be linearly proportional to matrix grain size by fitting with the experimental results. When the size of the reinforcement is large, the effect of thermal mismatch strengthening mechanism on the strength of MMCs is slight and can be ignored compared with the roles of Hall-Petch strengthening or load transfer effect. (C) 2015 Elsevier Ltd. All rights reserved.
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