Cu-Pd samples of compositions varying from 16 to 26 at.% Pd were irradiated in situ in a 1.5-MeV electron microscope at various temperatures. Low-temperature (90/sup 0/K) irradiation produced completely disordered solid solutions. Irradiation at room temperature up to as high as about 500/sup 0/K produced steady state short range order (SRO) which, for specimens of 18% or more Pd, is characterized by diffuse intensity at (1 +-q,0) and equivalent positions in reciprocal space (modulated SRO). In general, q is a function of composition, temperature and irradiation dose. High temperature irradiation tended to produce the expected equilibrium long range order - …
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Cu-Pd samples of compositions varying from 16 to 26 at.% Pd were irradiated in situ in a 1.5-MeV electron microscope at various temperatures. Low-temperature (90/sup 0/K) irradiation produced completely disordered solid solutions. Irradiation at room temperature up to as high as about 500/sup 0/K produced steady state short range order (SRO) which, for specimens of 18% or more Pd, is characterized by diffuse intensity at (1 +-q,0) and equivalent positions in reciprocal space (modulated SRO). In general, q is a function of composition, temperature and irradiation dose. High temperature irradiation tended to produce the expected equilibrium long range order - either L1/sub 2/ or a long period superstructure depending on composition and temperature. The 18 to 20% samples irradiated at room temperature exhibited steady state modulated SRO even though the expected equilibrium structure is one of unmodulated order (L1/sub 2/). It is suggested that spinodal ordering is responsible for this latter effect. An f.c.c. based Cu-Pd phase diagram is proposed incorporating ordering stability loci and a metastable Lifshitz point. 37 refs., 12 figs.
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Kulik, J.; Takeda, S. & de Fontaine, D.Cu/sub 3/Pd observed by high-voltage electron microscopy,
article,
July 1, 1987;
[Berkeley,] California.
(https://digital.library.unt.edu/ark:/67531/metadc1109641/:
accessed July 16, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
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