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HomeMaterials Science ForumMaterials Science Forum Vols. 519-521Secondary Precipitation in Aluminium Alloys & Its...

Secondary Precipitation in Aluminium Alloys & Its Role in Modern Heat Treatment

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Abstract:

This paper reviews some of the practical outcomes of exploiting secondary precipitation during the heat treatment of aluminium alloys and discusses current understanding of this phenomenon. Recent studies have utilised the techniques of positron annihilation spectroscopy (PAS), 3D atom probe (3DAP) as well as the more traditional transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) to investigate early precipitation events that occur during secondary ageing at low temperatures (~20-65°C). This work has confirmed that clustering and GP zone formation can modify the nature and distribution of precipitates that form when ageing is subsequently resumed at more elevated temperatures. Prospects for achieving further improvements in heat treatment schedules and alloy compositions to take greater advantage of secondary precipitation are also considered.

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Aluminium Alloys 2006 - ICAA10

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Periodical:

Materials Science Forum (Volumes 519-521)

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283-290

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https://doi.org/10.4028/www.scientific.net/MSF.519-521.283

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Online since:

July 2006

Authors:

Roger N. Lumley, J. Buha, Ian J. Polmear, A.J. Morton, A. Crosky

Keywords:

Clustering, Interrupted Ageing, Secondary Precipitation

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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