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Role of Stoichiometry on Ordering in Ni-Cr Alloys

Published online by Cambridge University Press:  18 May 2015

Fei Teng  and
Julie D. Tucker
Fei Teng
Affiliation:
School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, 204 Rogers Hall, Corvallis, OR 97331-6001, U.S.A.
Julie D. Tucker
Affiliation:
School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, 204 Rogers Hall, Corvallis, OR 97331-6001, U.S.A.
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Abstract

Mechanical property degradation due to an ordering phase transformation is a concern for alloys based on the Ni-Cr binary system (e.g., 690, 625), particularly in nuclear power applications, such as stream generator tubing, reactor pressure vessel and head control rod drive mechanism penetrations, where component lifetimes can exceed 40 years. In the present research, the disorder-order phase transformation has been studied in Ni-Cr model alloys with varying stoichiometry by experimental methods. In this paper, the effect of composition on ordering is characterized via X-ray diffraction.

Keywords

phase transformationx-ray diffraction (XRD)diffusion

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References

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