| Project/Area Number |
04650646
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | Yokohama National University |
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Principal Investigator |
FUKUTOMI Hiroshi Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Yokohama National University, Associate Professor, 工学部, 助教授 (90142265)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | Grain Boundary Sliding / Slide Hardening / Stress Change Test / Bicrystal / General Grain Boundary / Internal Stress |
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| Research Abstract |
In order to elucidate the mechanism of grain boundary sliding, the characteristics of the so called grain boundary slide hardening was investigated experimentally by the stress change tests. Aluminum bicrystals containing general grain boundary were grown by the Bridgeman method. High temperature microscope equipped with creep testing instrument was used. The change in the rate of grain boundary sliding accompanied with the stress change was measured by using video recording system.
The results are summarized as follows.
(1) The rate of grain boundary sliding increases with the increase in stress without exceptions. However, the amount of the increase in the rate of grain boundary sliding depends not only on the amount of stress change but also on the rate of grain boundary sliding before the stress change. (2) The decrease in the stress results in the decrease in the rate of grain boundary sliding or the stop of the sliding. (3) The reloading after the stress reduction generates the recovery of grain boundary slide hardening.
Based on these experimental results, it was concluded that the grain boundary sliding of general grain boundary in dominated by the motion of dislocations inside the grain boundary which is affected by the internal stresses caused by the dislocation structure around the grain boundary.
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