ECAP加工を施したAl-Mg-Sc合金の焼鈍による高サイクル疲労挙動の変化

概要

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The effect of short time annealing on the high-cycle fatigue behavior of an ultrafine grained Al-Mg-Sc alloy produced by equal channel angular pressing (ECAP) has been studied. Transmission electron microscopy revealed that small Al_3Sc precipitate particles initially restricted grain growth and then the Al_3Sc particles coarsened, allowing homogeneous grain growth during annealing at 350℃. The as-ECAP specimen exhibited high tensile strength, but low ductility. The annealed ECAP specimens showed slightly smaller values of 0.2% proof stress and ultimate tensile stress, and fairly larger values of elongation to failure than the as-ECAP specimen. In the as-ECAP specimens, cyclic softening was observed, whereas the annealed ECAP specimens exhibited no cyclic softening. The existence of Al_3Sc particles produced by the annealing enhanced the uniform deformation and the absence of cyclic softening in the annealed ECAP specimens. These resulted in increase of remarkably prolonged high-cycle fatigue lives in comparison with the as-ECAP specimen.
社団法人日本材料学会の論文
2006-09-15