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X-Ray Diffraction Study of Shape Memory in Uranium-Niobium Alloys

Published online by Cambridge University Press:  06 March 2019

D. A. Carpenter  and
R. A. Vandermeer
D. A. Carpenter
Affiliation:
Oak Ridge Y-12 Plant*, Union Carbide Corporation, Nuclear Division, Oak Ridge, Tennessee 37830
R. A. Vandermeer
Affiliation:
Oak Ridge Y-12 Plant*, Union Carbide Corporation, Nuclear Division, Oak Ridge, Tennessee 37830
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An x-ray diffraction study of the reversible deformation inodes associated with the shape memory effect has been carried out on a series of uranium-niobium alloys near the monotectoid composition (6.2 wt. % Nb). Diffraction patterns were measured as a function of strain, in situ, while the specimens were under stress as part of an attempt to explain the “easy-flow”, low-strain plateau in the stress-strain curve. The alloys, consisting of highly twinned, metastable α” (monoclinic) and γ° (tetragonal) phases derived from the high-temperature BCC γ phase, produced broad, overlapping diffraction lines difficult to analyze by conventional techniques. One solution to this problem was to use a segmented step-scan technique so as to apportion the scan time to concentrate on the most difficult regions. This paper discusses data obtained from an α” alloy and a dual-phase α” + γ° alloy.

Type
V. X-Ray Stress Determination, Position Sensitive Detectors, Fatigue and Fracture Characterization
Information
Advances in X-Ray Analysis , Volume 26: Thirty-First Annual Conference on Applications of X-ray Analysis, August 1-6, 1982 , 1982 , pp. 307 - 312
Copyright
Copyright © International Centre for Diffraction Data 1982

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References

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