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Isothermal transformation of beta-phase in Cu-rich Cu-Al-Sn alloys

Chakrabarty, AK and Jacob, KT (2013) Isothermal transformation of beta-phase in Cu-rich Cu-Al-Sn alloys. In: International Journal of Materials Research, 104 (5). pp. 430-441.

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Official URL: http://dx.doi.org/10.3139/146.110881

Abstract

Microstructural changes resulting from isothermal decomposition of the beta-phase have been studied in Cu-rich binary Cu-Al and ternary Cu-Al-Sn alloys containing up to 3 at.% Sn at temperatures from 873 to 673 K. Results are presented as TTT diagrams. The decomposition occurs in several stages, each of which involves the establishment of metastable equilibrium between beta and one or more of the product phases alpha, beta(1) and gamma(2). Addition of Sn has been shown to increase the stability of the ordered beta(1)-phase in relation to beta. In alloys containing more than 2 at.% Sn, the beta(1) emerges as a stable phase. At low Sn concentrations beta(1) is metastable. An important new finding is the existence of three-phase equilibrium microstructure containing alpha, beta(1) and gamma(2). Increasing addition of Sn alters the morphology of beta(1) from rosettes to dendrites and finally to Widmanstatten needles.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Carl Hanser Verlag.
Keywords: Microstructure; TTT Diagram; Metastable Equilibrium; Precipitate Morphology; Three-Phase Equilibria
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Francis Jayakanth
Date Deposited: 06 Aug 2013 11:35
Last Modified: 10 Aug 2013 04:35
URI: http://eprints.iisc.ac.in/id/eprint/46917

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