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Ordering Behavior and Corrosion Properties of Ni-Mo and Ni-Mo-Cr Alloys

Published online by Cambridge University Press:  21 February 2011

H. M. Tawancy  and
A. I. Asphahani
H. M. Tawancy
Affiliation:
First Author, Cabot Corporation, 1020 West Park Ave., Kokomo, Indiana 46901
A. I. Asphahani
Affiliation:
Next Author, Cabot Corporation, 1020 West Park Ave., Kokomo, Indiana 46901
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Abstract

Ni-Mo alloys containing 26–28 wt. pct. Mo are known for their excellent corrosion properties in reducing environments. When exposed to temperatures in the range 600°C to 800°C, however, these alloys undergo a longrrange ordering reaction from disordered fcc lattice to ordered Dla superlattice. This ordering phenomenon has been found to have detrimental effects on corrosion properties. Also, alloys based on the Ni-16Mo-16Cr system undergo a long range ordering reaction from disordered fcc lattice to ordered Pt2Mo-type superlattice in the temperature range of 400° to 600°C. However, in contrast to the case of Ni-Mo alloys, ordering in the Ni-Mo-Cr alloys has some beneficial effects on the aqueous corrosion properties. This difference in behavior between the Ni-Mo alloys and the Ni-Mo-Cr alloys is discussed interms of the ordering characteristics determined from transmission electron microscopy and diffraction, X-ray microanalysis in the scanning transmission electron microscope and Auger electron spectroscopy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 39: Symposium G – High-Temperature Ordered Intermetallic Alloys I , 1984 , 485
Copyright
Copyright © Materials Research Society 1985

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References

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