Segregation of impurity to the grain boundary and interphase boundary in ultra-fine microstructure
| Project/Area Number |
07455271
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tohoku University |
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Principal Investigator |
ISHIDA Kiyohito Faculty of Engineering, Tohoku University Professor, 工学部, 教授 (20151368)
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| Co-Investigator(Kenkyū-buntansha) |
OHNUMA Ikuo Faculty of Engineering, Tohoku University Research Associate, 工学部, 助手 (20250714)
KAINUMA Ryosuke Faculty of Engineering, Tohoku University Associate Professor, 工学部, 助教授 (20202004)
OHTANI Hiroshi Center for Interdisciplinary Research, Tohoku University Associate Professor, 学際科学研究センター, 助教授 (70176923)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1996: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1995: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Keywords | Grain boundary segregation / Grain size / Interface / Thermodynamics / Gain boundary / Impurity / Segregation energy |
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| Research Abstract |
Theoretical and experimental study of the effect of grain size on the grain boundary segregation was made and the results obtained are as follows ;
1.The equilibrium segregation of solute to the grain boundary can be described by the modified Mclean's equation :
2.The grain size effect on the intergranular segregation is remarkable with higher segregation energies and lower bulk concentrations with decreasing temperature.
3.When the segregation free energy of X is larger than that of Y in A-X-Y ternary alloy, the grain boundary concentration of X atom decreases with decreasing grain size, while that of Y atom depends on the bulk concentrations of solute.
4.An experimental evidence of the grain size dependence of the intergranular segregation in Cu-0.0015at.%Bi alloy was obtained.
5.The segregation energy of Bi in Cu was estimated to be about 62.5kJ/mol.
6.It is suggested that the grain size has a significant role on the grain boundary segregation not only in the metallic system but also in ceramics.
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Report
(3 results)
Research Products
(7 results)
