日本金属学会誌

J. Japan Inst. Metals, Vol. 40, No. 11 (1976),
pp. 1178-1184

Investigation of Mechanical Behavior of Aluminium Isoaxial Bicrystals by the Moir´e Method

K\=oji Shimizu1 and Heihachi Shimada1

1Department of Metal Processing and Mechanical Metallurgy, Faculty of Engineering, Tohoku University, Sendai

Abstract:

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.


(Received 1976/05/4)

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