K\=oji Shimizu1 and Heihachi Shimada1
1Department of Metal Processing and Mechanical Metallurgy, Faculty of Engineering, Tohoku University, Sendai
The authors are studying the mechanical behavior of the aluminium bicrystals and the results concerning the non-isoaxial bicrystals were already presented. In this investigation, systematic experiments were carried out forthe isoaxial bicrystals prepared from seed crystals of the desired orientation. The photoelastic coating and moir´e methods were used for the experimental analysis. Since the results which were obtained by the photoelastic coating method were already reported, the newly observed phenomena by the moir´e method are presented in this paper.
In the bicrystals whose crystal orientation of the tensile axis is < 111 > , the strain distribution is nearly uniform and there is little restriction on strain in the vicinity of the grain boundary, but there arises a relative rotation between the two component crystals with respect to the grain boundary when the angle of the grain boundary θ is 30°∼90°. On the other hand, in the bicrystal specimens with θ=0° and the crystal orientation whose Schmid factor is approximately 0.5, there arises a rotation without shear in some region of the specimen. In the specimen with θ=30°∼90° the strain in the vicinity of the grain boundary is strongly restricted and moreover there arises a rotation without shear only in this restricted region.
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