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An Investigation of Al-Rich Alloys in the Al-Cr-Ru System

Published online by Cambridge University Press:  02 July 2020

D.N. Compton ,
L.A. Cornish  and
M.J. Witcomb
D.N. Compton
Affiliation:
School of Process and Materials Engineering, University of the Witwatersrand, Private Bag 3, WITS, 2050, South Africa
L.A. Cornish
Affiliation:
School of Process and Materials Engineering, University of the Witwatersrand, Private Bag 3, WITS, 2050, South Africa
M.J. Witcomb
Affiliation:
Electron Microscope Unit, University of the Witwatersrand, Private Bag 3, WITS, 2050, South Africa
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Abstract

Many aerospace components that operate in aggressive environments make use of coating techniques for protection. One of the alloy systems used in these coatings is Al-Cr-Ru, with typical alloy compositions between 20-35 at.% Al and 20-35 at.% Ru. Alloys with a higher Al content may provide protection through an aluminium oxide (AI2O3) scale which is resistant to high-temperature oxidation and corrosion. However, Al-rich alloys in the Al-Cr-Ru system have not been thoroughly investigated. Previously, the phase boundaries of the binary phases, except AI9Cr4, into the ternary were established. The two ternary phases (Ternary 1 and Ternary 2) were identified, although their phase boundaries were unclear. Thus more alloys have been studied to enable the liquidus surface, the solid phase projection and the 600°C isothermal projection to be drawn.

As-cast alloys were examined metallographically in the scanning electron microscope. The phases present were confirmed by X-ray diffraction, and the compositions obtained by energy dispersive Xray spectroscopy.

Type
Metals and Alloys
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1248 - 1249
Copyright
Copyright © Microscopy Society of America 2001

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References

References:

1.Jackson, M.R., U.S. Patent 5,759,380 (2 June 1998).Google Scholar
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4. This research was supported by Mintek, DACST, NRF and MSRP.Google Scholar