Cu/sub 3/Pd observed by high-voltage electron microscopy

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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 - ... continued below

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Pages: 14

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Kulik, J.; Takeda, S. & de Fontaine, D. July 1, 1987.

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Description

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.

Physical Description

Pages: 14

Notes

NTIS, PC A02/MF A01; 1.

Source

  • Workshop on competing interactions and microstructures: statics and dynamics, Los Alamos, NM, USA, 5 May 1987

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  • Other: DE88000204
  • Report No.: LBL-23757
  • Report No.: CONF-8705168-5
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 6090142
  • Archival Resource Key: ark:/67531/metadc1109641

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 1, 1987

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • April 25, 2018, 3:59 p.m.

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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. (digital.library.unt.edu/ark:/67531/metadc1109641/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.