分子動力学法によるナノスケール多結晶体の引張解析 : 解析温度依存性の解析

概要

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The tensile fracturing process of a nanoscale polycrystalline pure iron, which was newly developed in a previous paper for MD simulation analysis, was examined. The simulation analysis was performed in the temperature range from 100 K to 700 K. Temperature dependences of tensile strength σ_B and Young's modulus are first studied, and σ_B is found to decrease with increasing temperature. Regarding the fracture mechanism, defects are generated on the grain boundaries as the strain increases at room or low temperature, until the defects reach a cross point of three grain boundaries. Moreover, trangranular defects are generated as the strain increases. At high temperature, the fracture is caused by grain boundary diffusion and large-scale slip formation near the grain boundaries, which finally leads to the defect formation. In other words, increasing temperature results in the fracture mode transition from a cleavage fracture to a ductile one.
一般社団法人日本機械学会の論文
1995-08-25