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An APFIM and TEM Study of Ni4Mo Precipitation In a Commercial Ni-28% Mo-1.4 % Fe-0.4% Cr Wt. % Alloy

Published online by Cambridge University Press:  02 July 2020

R. C. Thomson ,
N. Brown ,
J. S. Bates ,
K. F. Russell  and
M. K. Miller
R. C. Thomson
Affiliation:
institute of Polymer Technology and Materials Engineering, Loughborough University, Loughborough, Leicestershire, LE1 1 3TU, UK.
N. Brown
Affiliation:
institute of Polymer Technology and Materials Engineering, Loughborough University, Loughborough, Leicestershire, LE1 1 3TU, UK.
J. S. Bates
Affiliation:
institute of Polymer Technology and Materials Engineering, Loughborough University, Loughborough, Leicestershire, LE1 1 3TU, UK.
K. F. Russell
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6376, USA.
M. K. Miller
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6376, USA.
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Extract

Ni-Mo alloys containing at least 26 wt.% Mo have a negligible corrosion rate in boiling 10% hydrochloric acid and are therefore used in corrosive environments. A series of commercial Ni-Mo alloys has been developed with subtle variations in chemical composition. These alloys usually contain ∼28 wt.% Mo with additions of up to 5 % Fe and Cr. A significant amount of research has been performed to understand the microstructure and properties of these alloys, although most of the effort has concentrated on the Ni-Mo binary system. In some alloys with low Fe and Cr contents, a severe embrittlement problem has been observed due to the formation of the Ni4Mo (D1a-ordered) phase within the microstructure. The calculated section of the ternary Ni-Mo-Fe phase diagram in Fig. 1 illustrates that the addition of Fe stabilises Ni3Mo with respect to the brittle Ni4Mo phase.

Type
Imaging and Analysis at the Atomic Level: 30 Years of Atom Probe Field Ion Microscopy
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 92 - 93
Copyright
Copyright © Microscopy Society of America

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References

1.Brooks, C.R., Spruiell, J.E. and Stansbury, E.E., International Metals Reviews, 29 (1984) 210.CrossRefGoogle Scholar
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3. This research was sponsored by the Division of Materials Sciences, U. S. Department of Energy, under contract DE-AC05-960R22464 with Lockheed Martin Energy Research Corp and through the SHaRE program under contract DE-AC05-760R00033 with Oak Ridge Associated Universities, and support from BP Chemicals is gratefully acknowledged. This research was conducted utilizing the Shared Research Equipment (SHaRE) User Program facilities at Oak Ridge National Laboratory.Google Scholar