Microstructural and Mechanical Property Changes in the Ta-base T-111 Alloy with Aging

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2007.03.026· OSTI ID:931641

Leonard, Keith J ^[1]; Busby, Jeremy T ^[1]; Zinkle, Steven J ^[1]

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1. ORNL

The microstructural changes occurring in the Ta-base T-111 (Ta-8W-2Hf) alloy following 1100 h of aging at 1098, 1248 and 1398 K under inert atmosphere and its influence on the mechanical properties are reported. Microstructural evaluations were performed by optical, scanning electron microscopy and, for the first time, transmission electron microscopy. Electrical resistivity, hardness and tensile properties are compared between the as-annealed and aged samples. An increase in the amount of grain boundary precipitation with increasing aging temperature was found to decrease the electrical resistivity and material strength, leading to the eventual embrittlement of the alloy following aging at 1398 K.

• Research Organization: Oak Ridge National Laboratory (ORNL); Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931641
• Journal Information: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: 1-2 Vol. 366; ISSN 0022-3115; ISSN JNUMAM
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
ELECTRIC CONDUCTIVITY
EMBRITTLEMENT
HARDNESS
INERT ATMOSPHERE
MECHANICAL PROPERTIES
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
TANTALUM ALLOY-T111
TENSILE PROPERTIES
TRANSMISSION ELECTRON MICROSCOPY