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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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, ⩽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 |
|---|---|
| Publication: | Materials Science and Technology |
| Publisher: | IEE |
| 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.ac.in/id/eprint/10657 |
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