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Optimization of hot workability of an Al-Mg-Si alloy using processing maps

Sarkar, J and Prasad, YVRK and Surappa, MK (1995) Optimization of hot workability of an Al-Mg-Si alloy using processing maps. In: Journal of Materials Science (full set), 30 (11). pp. 2843-2848.

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The hot workability of an Al-Mg-Si alloy has been studied by conducting constant strain-rate compression tests. The temperature range and strain-rate regime selected for the present study were 300-550 degrees C and 0.001-1 s(-1), respectively. On the basis of true stress data, the strain-rate sensitivity values were calculated and used for establishing processing maps following the dynamic materials model. These maps delineate characteristic domains of different dissipative mechanisms. Two domains of dynamic recrystallization (DRX) have been identified which are associated with the peak efficiency of power dissipation (34%) and complete reconstitution of as-cast microstructure. As a result, optimum hot ductility is achieved in the DRX domains. The strain rates at which DRX domains occur are determined by the second-phase particles such as Mg2Si precipitates and intermetallic compounds. The alloy also exhibits microstructural instability in the form of localized plastic deformation in the temperature range 300-350 degrees C and at strain rate 1 s(-1).

Item Type: Journal Article
Publication: Journal of Materials Science (full set)
Publisher: Springer
Additional Information: Copyright of this article belongs to Springer.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 24 May 2011 05:39
Last Modified: 24 May 2011 05:39
URI: http://eprints.iisc.ac.in/id/eprint/37825

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