Short-range atomic order in f.c.c-Ni-9 at.% Al solid solution

• Published in: Functional Materials
• Date: 2007
• Main Authors: Bokoch, S.M., Kulish, M.P., Ryashko, V.V., Snagovskiy, O.V., Tatarenko, V.A.
• Format: Article
• Language: English
• Published: НТК «Інститут монокристалів» НАН України 2007
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/136458
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Short-range atomic order in f.c.c-Ni-9 at.% Al solid solution / S.M. Bokoch, M.P. Kulish, V.V. Ryashko, O.V. Snagovskiy, V.A. Tatarenko // Functional Materials. — 2007. — Т. 14, № 1. — С. 92-98. — Бібліогр.: 26 назв. — англ.

The short-range atomic order for a single crystal of f.c.c.—Ni-9 at.% Al solid solution quenched from 1073 K, as well as the short-range order transformations initial stages during isothermal annealing at 373 K have been investigated using the diffuse X-ray scattering method. Specific features of the thermal two-phonon diffuse scattering have been analyzed. It is shown that in quenched state, the short-range order corresponds to the presence of concentration waves in the alloy with ordering vectors kₛ = X(001) and kₛ = (000.2). The initial ordering kinetics stages are accompanied by a considerable increasing of the short-range order diffuse intensities for vectors close to the structural one. The time dependence of the Warren-Cowley short-range order parameters, as well as local atomic configurations simulation results (using the Monte-Carlo technique), have shown that such transformations correspond to the nucleation and growth of the two short-range ordered regions: clustered (decomposing) and L1₂-type weakly ordered (Ni₃AI) ones.