Phase Diagram of a Two-Dimensional Dilute Binary Alloy

G. K. Khalil, K. Yaldram and A. Sadiq ()
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G. K. Khalil: Nuclear Physics Division, Pakistan Institute of Nuclear Science and Technology, P. O. Nilore, Islamabad, Pakistan;
K. Yaldram: Nuclear Physics Division, Pakistan Institute of Nuclear Science and Technology, P. O. Nilore, Islamabad, Pakistan;
A. Sadiq: Center for Nuclear Studies, P. O. Nilore Islamabad, Pakistan

International Journal of Modern Physics C (IJMPC), 1997, vol. 08, issue 02, 139-146

Abstract: Phase diagrams of two-dimensional binary alloy with vacancies (ABV) is studied with pairwise interactionεAA, εBB, andεABbetween the nearest neighbors. Attention is focussed on the case where the vacancies are annealed andεBA= ε, εAA= εBB=0. For vacancy concentrationscv 0.2the critical temperature no longer shows this linear trend and falls to zero very sharply atcv=0.39. This critical vacancy concentration is slightly lower than the one expected for quenched vacancies, where the percolation threshold of atomic species is0.59 (cv=0.41). The mobility of vacancies and the nature of atomic interactions makes it energetically favorable for the vacancies to occupy the boundary layers betweenAandBphase separated regions, thus making the process of phase separation difficult. This lowers the critical temperature below that of the case where the vacancies are quenched. Salient features of the phase diagram are discussed by comparison with previously studied similar systems with different interaction energies.

Keywords: Simulation; Binary Alloy; Phase Diagram (search for similar items in EconPapers)
Date: 1997
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DOI: 10.1142/S012918319700014X

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