Abcc–fccTRANSITION OF ACuPRECIPITATE IN Abcc Fe–CuMATRIX

Paulina M. Stoop, Jan H. van der Merwe, C. J. Shiflet and R. A. Johnson
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Paulina M. Stoop: Department of Physics, University of South Africa, Pretoria, South Africa
Jan H. van der Merwe: Department of Physics, University of South Africa, Pretoria, South Africa
C. J. Shiflet: Department of Physics, University of South Africa, Pretoria, South Africa;
R. A. Johnson: Department of Physics, University of South Africa, Pretoria, South Africa;

Surface Review and Letters (SRL), 1997, vol. 04, issue 06, 1279-1282

Abstract: Three-dimensional, roughly spherical coherentbcc Cuprecipitates form inbcc Fe–Cualloys of lowCuconcentration. When the precipitate reaches a critical radiusR*of about 60 Å, the precipitate structure changes from coherent bcc to incoherent fcc. Embedded atom method atomic interaction potentials are used to calculate the volume defect energies ofCuprecipitate atoms and ofCu–Feinterfacial defect energies. An energetic balance criterion is used to predict a critical radiusRsomewhat different fromR*. Reasons for the discrepancy are discussed.

Date: 1997
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DOI: 10.1142/S0218625X9700167X

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