Field-Ion Microscope Studies of Ni_4W Type Ordering in the Near-Surface of Ni-16.6 at%W Alloy
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概要
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Field-ion microscope observations were made on Ni-16.6 at.%W alloy quenched from the high temperature α phase region to investigate Ni_4W type ordering in the near-surface during in-situ annealing. Somewhat below the peritectoid temperature, disc-shaped Ni_4W domains of the particular variants were formed preferentially at some of {420}_<FCC> planes on the surface regions with their disc faces being {110}_<BCT> superlattice planes (at 950℃ for ca. 5 min). The relaxation time of occurrence of an ordered domain at one of the {42O}_<FCC> nucleation sites and the rate of its thickness-increase were evaluated to be 520±260 s and 0.10±0.08 Å/s, respectively. Surface layers of a few to fifteen angstrom in thickness with lower degree of order were formed upon annealing for a few minutes at 920-860℃. The degree of order in the near-surface also decreased upon annealing partially ordered tips at the same temperatures.
- 社団法人応用物理学会の論文
- 1981-08-05
著者
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Yamamoto Masahiko
Department Of Materials Science And Engineering Faculty Of Engineering Osaka University
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Kingetsu Toshiki
Department Of Materials Science And Engineering Faculty Of Engineering Osaka University
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Kingetsu Toshiki
Advanced Materials Research Laboratories Nisshin Steel Company Ltd.
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NAKAMURA Shogo
Institute of Scientific and Industrial Research, Osaka University
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Nenno Soji
Department Of Materials Science And Engineering Faculty Of Engineering Osaka University
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Yamamoto Masahiko
Department Of Biofunctional Chemistry Graduate School Of Natural Science And Technology Okayama Univ
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FUKURA Hidenori
Department of Materials Science and Engineering, Faculty of Engineering, Osaka University
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Fukura Hidenori
Department Of Materials Science And Engineering Faculty Of Engineering Osaka University
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