Size dependent strengthening in particle reinforced aluminium |
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| Affiliation: | 1. Key Laboratory of Automobile Materials, Ministry of Education, and School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun, 130025, PR China;2. Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway;1. Department of Mechanical Engineering, Government College of Technology, Coimbatore 641013, India;2. Department of Mechanical Engineering, Faculty of Engineering, National Institute of Technology, Calicut, Kerala, India;1. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China;2. Department of Civil Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China;3. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | The tensile behaviour of composites produced by infiltrating ceramic particle beds with high purity (99.99%) Al is studied as a function of reinforcement size and chemistry (Al2O3 and B4C). The yield stress is higher in composites containing B4C particles, increasing with decreasing interparticle distance in both composite systems. The flow stress of the composites, when corrected for damage, displays the same dependence on interparticle distance as the yield stress. The overall strain hardening exponent, however, is independent of the microstructural scale. These observations are rationalized based on the theory of geometrically necessary dislocations. |
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