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Effect of zinc content on processing map for hot deformation of beta brass

Padmavardhani, D and Prasad, YVRK (1991) Effect of zinc content on processing map for hot deformation of beta brass. In: Materials Science and Technology, 7 (10). pp. 947-953.

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Abstract

The effect of zinc content on the processing map for hot deformation of β brass has been studied in the temperature range 550-800°C and strain rate range $0.001-100 s^{-1}$ in brasses containing 44, 47, 51 wt.% Zn. The three types of β brass exhibit superplastic deformation at temperatures of 550-800°C, &les;750°C, and 700-800°C, respectively, and at strain rates of$ <1s^{-1}$. In the 47% Zn β brass, superplasticity is curtailed at 800°C owing to abnormal grain growth caused by anomalous diffusion. In all three β brasses, superplastic deformation is dependent on the diffusion coefficient. At temperatures less than 700°C and in the strain rate range $0.01-1s^{-1}$, the 51% Zn β brass exhibits a domain of dynamic recrystallisation caused by the presence of γ phase particles in the matrix. At higher strain rates ($10 and 100 s^-1$), the brasses become microstructurally unstable, which is manifested by oscillations in the stress-strain curves and by adiabatic shear bands and strain markings in the micrographs.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to IEE.
Keywords: brass;heat treatment;oscillations;stress strain relations;superplasticity
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 22 Aug 2007
Last Modified: 27 Aug 2008 12:46
URI: http://eprints.iisc.ernet.in/id/eprint/10657

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