| Project/Area Number |
63850139
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical properties of metals
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
IIJIMA Yoshiaki TOHOKU UNIVERSITY, FACULTY OF ENGINEERING, RESEARCH ASSOCIATE., 工学部, 助手 (70005411)
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| Co-Investigator(Kenkyū-buntansha) |
HIRANO Ken-ichi TOHOKU UNIVERSITY, FACULTY OF ENGINEERING, PROFESSOR., 工学部, 教授 (10005209)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1988: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | Diffusion / Short time heating / Diffusion time correction / Volume diffusion / Grain boundary diffusion / Impurity diffusion / Substitutional diffusion / Interstitial diffusion |
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| Research Abstract |
Diffusion data are very important and essential as fundamental information for developing of new materials with high quality and efficiency. However, these materials have very small grains at most several tens mum and contain dislocations with high density. Thus, it would be impossible to determine volume, grain boundary and dislocation diffusion coefficients separately in such materials by the mechanical sectioning method after diffusion for a long time. A new technique is required to diffuse a submicron distance of a radioactive tracer and to measure its penetration profile by the sputter-microsectioning method. In the present work, an apparatus to anneal a specimen for a short time with rapid heating and cooling rates was designed. Specimen was set in a vacuum chamber and heated by infrared rays transmitted through a quartz viewing port. An infrared lamp was set above the port outside the chamber. Using this new technique, volume and grain boundary diffusion coefficients of ^<51>Cr in Ni-base Ni-Cr-Fe alloys were determined. Volume diffusion coefficients of ^<113>Sn in superconducting intermetallic compound Nb_3Sn with grains less than 10 pm were also obtained.
Determination of volume diffusion coefficients of ^<51>Cr in Fe and of ^<14>C in Co was made by using this technique. It was confirmed that this technique is useful to determine volume and grain boundary diffusion coefficients in materials with very small grains.
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