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Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
A Quantitative Study of Precipitation of Metastable Phases in an Al-1.94 at%Cu Alloy during Isothermal Aging at 373 K
Sung-Kyu SonMahoto TakedaKyu-Seop ParkMasanori MitomeYoshio BandoKi-Woo NamChang-Yong Kang
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2006 Volume 47 Issue 12 Pages 3001-3006

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Abstract

Precipitation behavior of metastable phases in an Al-1.94 at%Cu alloy during isothermal aging at 373 K was investigated by means of Vickers microhardness tests, DSC measurements and TEM observations. The size distribution of the precipitates was quantitatively investigated based on the TEM, HRTEM and HAADF-STEM images, and statistical parameters that fit the precipitate size distribution were determined under a log-normal distribution approximation. We have successfully estimated the volume fraction of copper in precipitates, and found that the G.P.(II) formation results in increases of volume fraction of metastable particles, mean size and hardness.

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© 2006 The Japan Institute of Metals and Materials
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