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Melting and solidification behavior of Pb-Sn embedded alloy nano-particles

Khan, Patan Yousaf and Bhattacharya, Victoria and Biswas, Krishanu and Chattopadhyay, Kamanio (2013) Melting and solidification behavior of Pb-Sn embedded alloy nano-particles. In: JOURNAL OF NANOPARTICLE RESEARCH, 15 (11).

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Official URL: http://dx.doi.org/10.1007/s11051-013-2049-8

Abstract

Nano-sized bimetallic dispersoids consisting of (Pb) and beta-(Sn) phases of eutectic composition (Pb26.1Sn73.9) embedded in aluminum and Al-Cu-Fe quasicrystalline matrices have been prepared by rapid solidification processing. The two phases, face centered cubic (Pb) and body center tetragonal, beta-(Sn) solid solution co-exist in all the embedded nanoparticles at room temperature. The phases bear crystallographic orientation relationship with the matrix. In situ TEM study has been carried out for the alloy particles to study the melting and the solidification behavior. The detailed microscopic observations indicate formation of a single-phase metastable fcc (Pb) in the nano-particles prior to the melting during heating. Solidification of these particles begins with nucleation of fcc (Pb), which phase separates into fcc (Pb) and beta-(Sn) lamellae in the solid state. In situ X-ray diffraction study is carried out to obtain lattice parameter of metastable fcc (Pb) and thereby an estimate of amount of Sn dissolved in the metastable (Pb) prior to the melting. The results are discussed in terms of a metastable phase diagram between fcc Pb and fcc Sn and invoking the size effect on the metastable phase diagram. The size factor is found to play a critical role in deciding the pathway of phase transformation as well as the extension of solid solubility of Sn in fcc (Pb) in the nano-particles.

Item Type: Journal Article
Additional Information: copyright for this article belongs to Springer Link
Keywords: Nanostructured metals; Nanoembedded particles; Melting; Solidification; In situ; Electron microscopy; X-ray diffraction
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 13 Nov 2013 10:49
Last Modified: 13 Nov 2013 10:49
URI: http://eprints.iisc.ac.in/id/eprint/47740

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