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TEM In Situ Investigation on Non-Equilibrium Eutectics in Semicontinuous Casting Ingot of Al-6.2Zn-2.3Mg-2.3Cu Super-High Strength Aluminum Alloy

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Abstract:

The in-situ investigation on morphology, chemical contents and crystal structure of non-equilibrium eutectics in semicontinuous casting ingot of Al-6.2Zn-2.3Mg-2.3Cu super-high strength aluminum alloy have been carried out by transmission electron microscopy equipped with energy dispersive X-ray spectroscopy (TEM-EDX). The results show that a large amount of lamellar non-equilibrium eutectics exists in semicontinuous casting ingot of this alloy; the non-matrix phase of this eutectics is a secondary phase which contains Al, Zn, Mg and Cu elements, with the atom ratio of approximately 1:1:1:1, and this non-matrix phase of non-equilibrium eutectics owns the same crystal structure as that of η phase (MgZn2).

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Periodical:

Materials Science Forum (Volumes 638-642)

Pages:

384-389

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.384

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Online since:

January 2010

Authors:

Feng Hua Gao, Gang Zhao, Wei Min Bian, Ni Tian

Keywords:

In Situ Investigation, MgZn2, Non-Equilibrium Eutectics, Super-High Strength Aluminum Alloy

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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