| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Outline of Final Research Achievements |
Non-linear mechanical fields around lattice defects in nano-scale composite materials was investigated by using the quasicontinuum (QC) and atomic simulations. First, the relationship between the grain size dependence of dislocation self-energy and the shear modulus of grain boundary (GB) regions was examined based on an elastic approach by the newly developed QC model. Next, GB structures were directly expressed by using atomic models and it was found that atomic shuffling in GB regions could shield the mechanical field caused by lattice dislocations. Furthermore, the influence of hetero-interface strength on the mechanical properties of multilayered composites was investigated by using atomic simulations. The decomposition of the lattice dislocation core structure at the hetero-interface is strongly affected by the interface strength; hence, the hetero-interface strength is one of the important factors to design an excellent material with high strength and high ductility.
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