Examination of Dislocation Mechanism on Grain Boundary Sliding in High Angle Grain Boundaries by Stress Change Test |
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Authors: | Hiroshi Fukutomi Takeshi Yamamoto Kazushi Nonomura Kazuyoshi Takada |
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Affiliation: | (1) Department of Mechanical Engineering and Materials Science, Yokohama National University, 79-5 Tokiwadai Hodogaya-ku, Yokohama, 240-8501, Japan |
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Abstract: | In order to understand the factors dominating grain boundary sliding, stress change tests and stress reversal tests were conducted on aluminum bicrystal specimens with high angle grain boundaries. It is found that small change in stress results in the remarkable change in the rate of grain boundary sliding. Stress reversal tests showed that grain boundary slide hardening does not work for the sliding to the direction opposite to that before the stress reversal. Mean internal stresses for the dislocations contributing to grain boundary sliding are experimentally measured by a method consisting of stress change and annealing. It is found that the velocity of dislocations in the grain boundary is in proportion to the mean effective stress. |
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Keywords: | grain boundary sliding high angle grain boundary stress change test effective stress |
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