Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/9731
Title: Elastic constants of bcc shape-memory binary alloys: Effect of the configurational ordering
Author: Castán i Vidal, Maria Teresa
Planes Vila, Antoni
Keywords: Propietats mecàniques
Diagrames de fase
Aliatges binaris
Elasticitat
Mechanical properties
Phase diagrams
Binary systems (Metallurgy)
Elasticity
Issue Date: 1988
Publisher: The American Physical Society
Abstract: The relationship between the elastic shear modulus C’=1/2(C11-C12) and the atomic order state in a shape-memory binary alloy AxB1−x above its martensitic transition temperature is analyzed. We first present a simple method to evaluate the elastic constants in binary alloys, assuming the atoms interact via a two-body Morse potential. For CuZn and AgZn alloys, the potential parameters corresponding to the different A-A, B-B, and A-B pairs are determined from experimental data of the elastic constant C’ for different alloy compositions. We next calculate C’ at 0 K as a function of the ordering state. To do this, we use atomic configurations obtained with a Monte Carlo simulation of the Ising model for a bcc binary alloy, at each temperature Ti. We obtain a linear relationship between C’ and the short-range-order parameter η. We also show that the deviations from the linear behavior observed when C’ is represented against the square of the long-rang-order parameter 〈S〉 come mainly from the critical behavior of the system near the order-disorder temperature Tc.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.38.7959
It is part of: Physical Review B, 1988, vol. 38, núm. 12, p. 7959-7965.
Related resource: http://dx.doi.org/10.1103/PhysRevB.38.7959
URI: http://hdl.handle.net/2445/9731
ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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