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Analytical Electron Microscopy of V-4%Ti-4%Cr Alloys

Published online by Cambridge University Press:  02 July 2020

J. Bentley  and
B. A. Pint
J. Bentley
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, PO Box 2008, Oak, Ridge, TN37831
B. A. Pint
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, PO Box 2008, Oak, Ridge, TN37831
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Abstract

An important aspect in the consideration of V-4%Ti-4%Cr alloys as structural materials for proposed fusion reactors, especially for weldments, is the sensitivity of mechanical behavior to oxygen content. Following a 1-h anneal at 1200°C, sheet specimens were subjected to extended (16h to 43h) anneals at 500°C in 5 to 8 x 10-6 torr oxygen, followed by an homogenization vacuum anneal of 100 h at 600°C. Weight gains indicated ∼200 to >1400 wppm oxygen doping. Specimens were also subjected to an additional vacuum anneal for 4 h at 950°C. Specimens were prepared by standard double-jet electropolishing for TEM characterization with a Philips CM30 (LaB6) equipped with a Gatan Imaging Filter (GIF), and with a Philips CM200FEG equipped with Oxford EDS, GIF, and Emispec Vision integrated acquisition system.

Following oxygen doping and homogenization, high concentrations of nanoscale G.P.-zone-like clusters on ﹛001﹜ were observed in the matrix, with a ∼200-nm-wide precipitate free zone (PFZ) at grain boundaries.

Type
Metals and Alloys
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1246 - 1247
Copyright
Copyright © Microscopy Society of America 2001

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References

1. Bentley, J. et al., Proc. Ann Microbeam Analysis Soc. Meeting 28 (1994) 191.Google Scholar

2. Hoelzer, D.T., ORNL, unpublished research, Feb 2001.Google Scholar

3. Research supported by the Office of Fusion Energy Sciences and at the ORNL SHaRE User Facility by the Division of Materials Sciences and Engineering, U.S. Department of Energy, under contract DE-AC05-00OR22725 with UT-Battelle, LLC.Google Scholar