Jpn. J. Appl. Phys. 20 (1981) pp. 1407-1421  |Next Article|  |Table of Contents|
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Field-Ion Microscope Studies of Ni₄W Type Ordering in the Near-Surface of Ni-16.6 at%W Alloy

Toshiki Kingetsu, Masahiko Yamamoto, Soji Nenno and Hidenori Fukura

(Received April 15, 1981; accepted for publication May 23, 1981)

Field-ion microscope observations were made on Ni-16.6 at.%W alloy quenched from the high temperature α phase region to investigate Ni₄W type ordering in the near-surface during in-situ annealing. Somewhat below the peritectoid temperature, disc-shaped Ni₄W 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°C for ca. 5 min). The relaxation time of occurrence of an ordered domain at one of the {420}_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°C. The degree of order in the near-surface also decreased upon annealing partially ordered tips at the same temperatures.

URL: http://jjap.jsap.jp/link?JJAP/20/1407/
DOI: 10.1143/JJAP.20.1407

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