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Study of Precipitates Morphology and Composition Evolution using Scanning Electron Microscopy (SEM) and Energy Dispersive X Ray Spectroscopy (eds) in as Cast, Forged and Heat Treated Complex Aluminium Bronzes

Published online by Cambridge University Press:  02 July 2020

I. B. de Arenas ,
L. Centeno  and
F. Arenas
I. B. de Arenas
Affiliation:
Department of Materials Technology. Universitary Institute of Technology - R.C, P.O. Box 40347. Caracas 1040-A., Venezuela
L. Centeno
Affiliation:
Department of Materials Technology. Universitary Institute of Technology - R.C, P.O. Box 40347. Caracas 1040-A., Venezuela
F. Arenas
Affiliation:
Department of Materials Technology. Universitary Institute of Technology - R.C, P.O. Box 40347. Caracas 1040-A., Venezuela
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Extract

The Aluminium Bronzes are successfully used in heat exchanger tubes, particularly in chemical and oil industries, where they are subjected to sligthly acid conditions or higher temperatures and stresses than other copper alloys allow. For a maximun resistance to corrosion an understanding of the effects of composition and metallurgical structure is desirable. This work study the different precipitates appearing in ASTM B148-C95800 complex Al bronze alloy, due to the structural development in as cast,forged and heat treated conditions, the presence of Fe and Ni as additions enhance the presence of many different precipitates all over the structure, changing the corrosion resistance and mechanical properties.

In this type of alloy the non-stoichiometric β phase breaks down progresively during cooling from high temperatures: 750° - 950°C to give a finely divided iron - nickel - aluminium “kappa” (κ) phase in a copper rich (α) matrix. Such α + κ alloys generally can contains small quantity of β and none γ2 (deleterious to all properties), showing excellent corrosion resistance combined with high tensile strength.

Type
Phase Transformations in Metals and Alloys
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 703 - 704
Copyright
Copyright © Microscopy Society of America 1997

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References

1-Brezina, P.. Heat treatment of complex aluminium bronzes. International Metals Reviews, 27, (1982), 77-115.Google Scholar
2-Goldstein, J., Newbury, D., Echlin, P., Joy, D., Romig, A., Lyman, Ch., Fiori, Ch., Lifshin., E., Scanning Electron Microscopy and X-Ray Microanalysis. Second Edition. New York. Plenum Press. (1992).10.1007/978-1-4613-0491-3CrossRefGoogle Scholar
3- This research was supported by Fundición Metalúrgica LEMOS at Barquisimeto. Venezuela.Google Scholar