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Progress in High Performance Nanocomposites Based ona Strategy of Strain Matching |
Lishan CUI(), Daqiang JIANG |
College of Science, China University of Petroleum-Beijing, Beijing 102200, China |
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Cite this article:
Lishan CUI, Daqiang JIANG. Progress in High Performance Nanocomposites Based ona Strategy of Strain Matching. Acta Metall Sin, 2019, 55(1): 45-58.
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Abstract Freestanding nanowires have ultrahigh elastic strain limits (4%~7%) and yield strengths, it is expected that composites reinforced by nanowires will have exceptional mechanical properties. However, the results obtained so far have been disappointing, primarily because the intrinsic mechanical properties of nanowires have not been successfully exploited in bulk composites. This is thought to be due to the inelastic strain incompatibilities at typical dislocation-piled-up interfaces. Therefore, we proposed a concept of elastic and transformation strain matching to realize the intrinsic mechanical properties of the nanowires. By creating a nanostructured composite consisting of nano Nb embedded in a NiTi matrix, the intrinsic mechanical properties of Nb nanowires, nano ribbons and nano particles are realized. Besides, this breakthrough triggers a new mechanism of stress coupling that induces the nanocomposite showing excellent mechanical properties. Based on the design strategy, we developed an in situ composite that possesses a large quasi-linear elastic strain of over 6%, a low Young's modulus of less than 28 GPa, and a high yield strength of 1.65 GPa.
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Received: 28 September 2018
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Fund: Supported by National Natural Science Foundation of China (No.51231008) |
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