CORRELATION BETWEEN GRAIN BOUNDARY CORROSION AND MISORIENTATION IN Nb BICRYSTALS
QIAN Xiangrong;ZHOU Yicang;ZHANG Dongbin;MA Ruzhang Shanghai Iron and Steel Research Institute; Y. T. Chou Lehigh University; U. S. A.; University of Science and Technology Beijing
Cite this article:
QIAN Xiangrong;ZHOU Yicang;ZHANG Dongbin;MA Ruzhang Shanghai Iron and Steel Research Institute; Y. T. Chou Lehigh University; U. S. A.; University of Science and Technology Beijing. CORRELATION BETWEEN GRAIN BOUNDARY CORROSION AND MISORIENTATION IN Nb BICRYSTALS. Acta Metall Sin, 1993, 29(2): 83-87.
Abstract Grain boundary corrosion of oriented Nb bicrystals with symmetric tiltboundaries has been investigated by use of interference microscope. The corrosion depth, d,increases with misorientation angle, θ, except near some coincidence-site-lattice boundarieswhere minimum cusps appear. For small-angle boundaries, d depends on θ following aRead-Shockley type relationship. The atomistic structure and the local expansion of grainboundaries were calculated using a computer simulation method. The structure dependence ofgrain boundary corrosion is explained in terms of variation in free volume.
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