Structure evolution and phase change in Ag-5.1 at.% Bi alloy during mechanical alloying

Chithra, S and Lele, S and Chattopadhyay, K (2011) Structure evolution and phase change in Ag-5.1 at.% Bi alloy during mechanical alloying. In: Acta Materialia, 59 (5). pp. 2009-2019.

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Abstract

In this paper we explore the enhancement of solubility in a mechanically driven immiscible system experimentally using a mixture of Ag and Bi powders corresponding to a composition of Ag-5.1 at.% Bi. Increase in solubility can be correlated with the combination of sizes of both Ag and Bi at the nanometric scale. It is shown that complete solid solution of Ag-5.1 at.% Bi forms when the respective sizes of :Bi and Ag exceed 13 and 8 nm respectively. We have carried out a thermodynamic analysis of the size- and strain-dependent free energy landscape and compared the results to the initial mixture of microsized particles to rationalize the evolution of Ag solid solution. The agreement indicates that the emerging driving force for the formation of solid solution is primarily due to size reduction rather than the enhanced kinetics of mass transport due to mechanical driving. (c) 2011 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

Item Type:	Journal Article
Publication:	Acta Materialia
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Mechanical alloying; Phase transformation; Nanostructured materials; Interface energy; Solid solution
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	25 Mar 2011 06:06
Last Modified:	25 Mar 2011 06:06
URI:	http://eprints.iisc.ac.in/id/eprint/36233

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