Actions for Low-Temperature Agining Behavior of U-6 wt% Nb [electronic resource].

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Low-Temperature Agining Behavior of U-6 wt% Nb [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2005.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
PDF-FILE: 14 ; SIZE: 2.9 MBYTES pages
Additional Creators
Lawrence Livermore National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Phase stability and aging mechanisms in a water-quenched (WQ) U-6wt% Nb (U-14at% Nb) alloy artificially aged at 200 C and naturally aged at ambient temperature for 15 years have been investigated and studied using Vickers-hardness measurement, X-ray diffraction (XRD) analysis, and transmission electron microscopy (TEM) techniques. Age hardening/softening phenomenon is recorded from the artificially aged samples based upon the microhardness measurement. The age hardening can be readily rationalized by the occurrence of fine-scaled Nb segregation, or spinodal decomposition, within the α'' domains, which results in the formation of a modulated structure containing nano-scaled Nb-rich and Nb-lean domains. Prolonged aging leads to age softening of the alloy by coarsening of the modulated structure. Chemical ordering, or disorder-order phase transformation, is found within the naturally aged alloy according to TEM observations of antiphase domain boundaries (APBs) and superlattice diffraction patterns. A possible superlattice structure for the ordered α'' phase observed in the naturally aged sample and underlying low-temperature aging mechanisms are proposed.
Report Numbers
E 1.99:ucrl-conf-209428
ucrl-conf-209428
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Note
Published through SciTech Connect.
01/26/2005.
"ucrl-conf-209428"
Presented at: The 26th Compatibility, Aging, and Stockpile Stewardship Conference, Aiken, SC (US), 04/26/2005--04/28/2005.
Hsiung, L L.
Funding Information
W-7405-ENG-48
View MARC record | catkey: 14448543