Unraveling the Age Hardening Response in U-Nb Alloys

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Materials Science Forum (Online)

DOI:https://doi.org/10.4028/www.scientific.net/MSF.879.665· OSTI ID:1338743

Hackenberg, Robert Errol  ^[1]; Hemphill, Geralyn M. Sewald ^[1]; Forsyth, Robert Thomas ^[1]; Papin, Pallas Athene ^[1]; Kelly, Ann M. ^[1]; Tucker, Tim Jeffrey ^[1]; Aikin, Robert M. Jr. ^[1]; Alexander, David John ^[1]; Lopez, Michael F. ^[1]; Clarke, Amy Jean ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Complicating factors that have stymied understanding of uranium-niobium’s aging response are briefly reviewed, including (1) niobium inhomogeneity, (2) machining damage effects on tensile properties, (3) early-time transients of ductility increase, and (4) the variety of phase transformations. A simple Logistic-Arrhenius model was applied to predict yield and ultimate tensile strengths and tensile elongation of U-4Nb as a function of thermal age. Lastly, fits to each model yielded an apparent activation energy that was compared with phase transformation mechanisms.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-06NA25396
• OSTI ID: 1338743
• Report Number(s): LA-UR-16-20301
• Journal Information: Materials Science Forum (Online), Vol. 879; Conference: THERMEC-2016: 9th International Conference on Processing & Manufacturing of Advanced Materials, Graz (Austria), 29 May - 03 Jun 2016; ISSN 1662-9752
• Publisher: Trans Tech Publications
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Aging
Phase Transformations
Precipitation Hardening
Tensile Testing