2001 Fiscal Year Final Research Report Summary
MEASUREMENT OF THE INTERACTION BETWEEN A DISLOCATION AND A SOLUTE ATOM BY AMPLITUDE-DEPENDENT INTERNAL FRICTION FOR ALLOY STRENGTHENING.
| Project/Area Number |
11650682
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical properties of metals
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| Research Institution | TEIKYO UNIVERSITY OF SClENCE & TECHNOLOOY (2000-2001)
Hiroshima University (1999) |
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Principal Investigator |
KOSUGI Toshio DEPARTMENT OF ENVIRONMENTAL & MATERIAL ENGINEERING, TEIKYO UNIVERSITY OF SClENCE & TECHNOLOOY, ASSOCIATE PROFESSOR, 理工学部, 助教授 (10153545)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMICHI Isao HIROSHIMA UNIVERSITY, GRADUATE SCHOOL OF SCIENCE, CRYOGENIC CENTER, RESEARCH ASSOCIATE, 大学院・理工学研究科, 助手 (40142335)
NISHINO Yoichi NAGOYA INSTITUTE OF TECHNOLOGY, FACULTY OF ENGINEERING, DEPARTMENT OF MATERIAL SCIENCE, ASSOCIATE PROFESSOR, 工学部, 助教授 (50198488)
KOGURE Yoshiaki DEPARTMENT OF ENVIRONMENTAL & MATERIAL ENGINEERING, TEIKYO UNIVERSITY OF SClENCE & TECHNOLOOY, PROFESSOR, 理工学部, 教授 (20016124)
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| Project Period (FY) |
1999 – 2001
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| Keywords | DISLOCATION-SOLUTE-ATOM INTERACTION / SOLUTION STRENGTENING / INTERNAL FRICTION / AMPLITUDE DEPENDENCE / LOW TEMPERATURE / COPPER / INTERACTION POTENTIAL / INTERACTION ENERGY |
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| Research Abstract |
We have investigated the interaction between a dislocation and a solute atom in FCC metals by a low-temperature amplitude-dependent internal friction (ADIF). The main purpose is to provide basic information for alloy strengthening. The interaction potential and interaction energies are sucessfully measured for aluminum dilute alloys. The energies are 0.11, 0.135, 0.19, 0.195 in eV for Zn, Ag, Mg, Cu aolute atoms, respectively. The measurement was extended to further low temperature i.e. 0.1 K to find the evidence of quantum tunneling of a dislocation through a pinning atom. As a result dislocation tunneling is found and a theoretical basis is provided. The measurement was also extended to higher temperature, below room temperature. We found that a dislocation interacts with several pinning atoms simultaneously when it breaks away. This simultaneous breakaway is considered the elementary process of the yield of solid solutions. A new result of ADIF in copper crystals was compared with that for aluminum.
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