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Kinetics behaviour of metastable equiatomic Cu–Fe solid solution as function of the number of collisions induced by mechanical alloying

Contini, Alessandro and Delogu, Francesco and Garroni, Sebastiano and Mulas, Gabriele Raimondo Celestino and Enzo, Stefano (2014) Kinetics behaviour of metastable equiatomic Cu–Fe solid solution as function of the number of collisions induced by mechanical alloying. Journal of Alloys and Compounds, Vol. 615 (Suppl. 1), S551-S554. ISSN 0925-8388. eISSN 1873-4669. Article.

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DOI: 10.1016/j.jallcom.2013.11.232

Abstract

We have addressed a new study by mechanical alloying on the nominally immiscible Cu50Fe50 system with the aim of relating the solid state transformation process, with formation of a disordered unstable solid solution having the face centered cubic habit, to parameters reflecting the impulsive, discontinuous nature of the process. The milling set-up, tools and powder were adjusted in order to ensure completely anelastic hits. Phase analysis, structure and microstructure parameters of such powder system have been followed accurately in the course of the kinetics by X-ray Diffraction using the Rietveld method. The experimental kinetics data points of the amount of transformed solid solution show a typical sigmoidal behavior. It was assumed that dissolution only occurs in the volumes of material that have undergone the necessary critical loading conditions, which is accounted by a discrete series expansion. The mass fraction effectively processed at each collision can be regarded as an apparent rate constant for the microstructural refinement and phase transformation processes. Analysis of model curves fitting the experimental data suggests that it takes up an average of 6 impacts of coupled powder particles to drive the system to the new unstable nano-crystalline state.

Item Type:Article
ID Code:10670
Status:Published
Refereed:Yes
Uncontrolled Keywords:Mechanochemistry, solid state reactions, critical loading conditions, kinetics analysis, rietveld method
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:Elsevier
ISSN:0925-8388
eISSN:1873-4669
Deposited On:22 Jan 2015 10:00

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