Electron-metallographic studies of precipitation in an aluminium-zinc-magnesium alloy

Ramesam, J and Rao, MR and Anantharaman, TR (1962) Electron-metallographic studies of precipitation in an aluminium-zinc-magnesium alloy. In: Proceedings of the Indian Academy of Sciences - Section A, 55 (2). pp. 121-129.

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Abstract

The mechanism of sub-microscopic precipitation in an Al-Zn-Mg alloy selected for its maximum response to ageing has been studied by a standardized oxide-replica technique in a 100 kV. Philips Electron Microscope. Contrary to earlier conclusions, examination of the oxide replicas has been shown to reveal details of the precipitation process almost as clearly as the thin-foil transmission technique. The reported formation of spherical Guinier-Preston zones followed by the development of a Widmanstaetten pattern of precipitated platelets has been confirmed. The zones have, however, been shown to grow into the platelets and not to dissolve in the matrix as reported earlier. The precipitation process has been correlated with the Hardness/Ageing Time curve and the structure of the precipitates has also been discussed.

Item Type:	Journal Article
Publication:	Proceedings of the Indian Academy of Sciences - Section A
Publisher:	Indian Academy of Sciences
Additional Information:	Copyright of this article belongs to Indian Academy of Sciences.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	15 Jun 2010 07:16
Last Modified:	19 Sep 2010 06:09
URI:	http://eprints.iisc.ac.in/id/eprint/28406

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