Abstract
Observation range necessary for evaluation of non-uniform deformation behavior of polycrystalline materials study in detail. For estimation of the non-uniform deformation behavior of crystal grains in polycrystalline material, the thinning processing of crystal grain boundary lines and calculation of crystal grains strain are programmed. The thinning processing of crystal grain boundary line is calculated by image processing based on Hilditch method. Logarithmic strains are calculated by measuring maximum distances of grain boundaries of respective grains at every five-degree interval from the loading direction. The strain distribution in all direction for a grain is approximated with an ellipse using the method of least squares and the principal strain are obtained as the long and the short axes of the ellipse. Then, Non-uniform deformation behavior of coarsening polycrystalline brass under tensile loading is estimated. Variation of value and direction of principal strain is discussed from the viewpoint of effects of observation range.
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