OS0524 アモルファス金属の局所格子不安定性解析 : 不安定原子の統計的評価(微視構造を有する材料の変形と破壊,オーガナイズドセッション)

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  • OS0524 Local Lattice Instability Analysis on Amorphous Metals : Statistical Evaluation on Unstable Atoms

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We have attempted to reveal the deformation mechanism of amorphous metal from the unique viewpoint of "local lattice instability" or the positive definiteness of atomic elastic stiffness coefficients, B^α_<ij>. LLIA distinguishes the "unstable atoms" as "defects" from the disordered structure of amorphous metals. In the previous report, we have compared mechanical conditions and roles of unstable atoms in monatomic amorphous metals of Ni and Al. As a result, it was clarified that the deformation mechanism between Ni and Al amorphous are different. In the present study, we have carefully discussed about changes in unstable atoms during relaxation to clarify the influence of fluctuations of B^α_<ij> by atomic vibrations. Atoms that have become detB^α_<ij> > 0 and detB^α_<ij> < 0 during relaxation feel tensile stresses. It was found that these atoms contribute to the deformation of amorphous metals.

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