Serrated flow of aluminium alloys influenced by precipitates

Pink, Erwin and Kumar, Subodh and Tian, Baohui (2000) Serrated flow of aluminium alloys influenced by precipitates. In: International-Union-of-Materials-Research-Societies International Conference on Advanced Materials (IUMRS-ICAM 99), JUN 13-18, 1999, Beijing, Peoples Republic China, pp. 17-24.

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Abstract

Serrated flow (which is normally a consequence of interactions between diffusing solute atoms and dislocations) is affected in various ways by precipitation. New models suggest that the shearing of precipitates is directly responsible for the serrations. To test this possibility, an aluminium-lithium alloy was examined. Tensile deformation curves exhibit serrations which previously have been shown to be of two different kinds. Further characteristics of both these serration types (e.g. the stress-drop size, the drop time and the drop rate) are measured after different annealing and ageing procedures, and were also found to be influenced by the presence of coherent delta'-precipitates, but within the limits of their normal behaviour. It is concluded that the normal drops which are initiated by a solid-solution effect are just modified in the aftermath of dislocations overcoming the precipitates due to altered structural conditions.

Item Type:	Conference Paper
Publication:	Materials Science and Engineering
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Alloys;Aluminium–lithium;Precipitates
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	13 Nov 2009 06:18
Last Modified:	19 Sep 2010 05:00
URI:	http://eprints.iisc.ac.in/id/eprint/18198

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