Mechanism and kinetics of solid-state amorphization by mechanical alloying of Al65Cu35-xNbx

Manna, I. ; Nandi, P. ; Nambissan, P. M. G. (2004) Mechanism and kinetics of solid-state amorphization by mechanical alloying of Al65Cu35-xNbx Philosophical Magazine, 84 (33). pp. 3585-3598. ISSN 1478-6435

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Related URL: http://dx.doi.org/10.1080/14786430412331283613

Abstract

In the present study, we have synthesized a number of Al-based Al65Cu35-x Nbx ternary alloys by mechanical alloying and undertaken a detailed characterization of their microstructural evolution by X-ray diffraction, high-resolution transmission electron microscopy and positron annihilation spectroscopy. To predict the phase-equilibrium in a given ternary powder blend subjected to mechanical alloying, we have modified the Miedema model to incorporate the influence of interfacial energy contribution in solid-state amorphization and analytically calculate the enthalpy and Gibbs energy of ternary amorphous and nanocrystalline solid solutions. The predicted trend compares well with the experimental data. Finally, an attempt has been made to determine the mechanism of solid-state amorphization in Al65Cu35-xNbx alloys utilizing both experimental results and model-based thermodynamic calculations.

Item Type:Article
Source:Copyright of this article belongs to Taylor and Francis Ltd.
ID Code:18922
Deposited On:17 Nov 2010 15:28
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