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Application of effective potential formalism to mechanical alloying in Ag–Cu and Cu–Fe systems

Ravishankar, N and Abinandanan, TA and Chattopadhyay, K (2001) Application of effective potential formalism to mechanical alloying in Ag–Cu and Cu–Fe systems. In: Materials Science and Engineering A, 304-30 . pp. 413-417.

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Official URL: http://dx.doi.org/10.1016/S0921-5093(00)01484-2

Abstract

We have used the competing dynamics model and the effective potential formalism for studying phase stability during mechanical milling of Ag-Cu and Cu-Fe systems. We first present a method for extracting an effective potential for systems in which the atomic mobility may depend on alloy composition. Using an estimate for the typical ballistic diffusivity, we apply this formalism to calculate the dynamical phase diagram for the Ag-Cu and Cu-Fe binary systems under mechanical milling. For the Ag-Cu system, the dynamical phase diagram exhibits a miscibility gap that closes in on itself at low temperatures, due to the exponentially decreasing thermal diffusivity (and hence, increasing influence of ballistic diffusivity) with decreasing temperature. In the Cu-Fe system, in which the effective potential for both the bcc and fcc phases need to be taken into account, the fcc phase is shown to be stabilized at low temperatures for all the alloys, except the almost pure iron (which is stabilized in its bcc form). These results are critically compared with available experimental results.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Effective potential formalism;Ag–Cu and Cu–Fe systems;Mechanical alloying
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 16 Apr 2007
Last Modified: 22 Feb 2012 08:25
URI: http://eprints.iisc.ernet.in/id/eprint/10557

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