Effect of Sub-Structure on Flow Stress of Polycrystalline Aluminum

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概要

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• The influence of polygonized sub-structure on flow stress of pure aluminum (99.9%) was investigated.As flow stress increases parabolically with the inverse square root of sub-grain size, Petch's relation does not hold true between flow stress and sub-grain size. It is clarified that not only sub-grain size but also misorientation across the sub-boundaries has great influence on flow stress.In addition, it is observed during the experiment that flow stress σ_f increases with the square root of excess dislocation density D_b of the sub-boundary, yielding the relation σ_f=σ_0+α'GbD_b^<1/2>.The effect of sub-structure on flow stress appears to be better explainable in terms of the work-hardening theory which is inclusive of the interation of dislocations rather than Petch's pile-up theory.

• 一般社団法人日本機械学会の論文

著者

• Miyoshi Yoshio

  Faculty Of Engineering Science Osaka University

• Saga Jiro

  Faculty Of Engineering Science Osaka University

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• Effect of Sub-Structure on Flow Stress of Polycrystalline Aluminum

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