Yoichi Ishida1, Ken Inoue1, Koichi Sassa1 and Masao Kato1
1Institute of Industrial Science University of Tokyo, Tokyo
The influence of grain boundary structure on the boundary diffusion of 65Zn at 100 and 150°C in coarse grained pure aluminium was analysed by the electron channeling pattern and Auger electron autoradiography. Precise determination of the orientation relationship is achieved by the former, while the boundary segregation of zinc of the order of 0.01% is analysed by the latter technique. Diffusion enhancement was observed in most of the grain boundaries to a varying degree: In 40% of the boundary triple point the enhancement in one boundary was less than half of the other boundaries. One-third of such boundaries were small angle boundaries and the rest were mostly coincidence boundaries.
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