Effects of long-term aging on ductility and microstructure of Cb and Mo alloys
A program was conducted to determine if aging embrittlement occurs in columbium-base alloys C-103, Cb-1Zr, and Cb-752 or in a molybdenum alloy, Mo-TZM. Results showed that aging embrittlement does not occur in C-103, Cb-1Zr, or Mo-TZM during long-term (1000 hour) aging at temperatures in the range of 700 to 1025/sup 0/C. In comparison, aging embrittlement occurred in the Cb-752 alloy after similar aging at 900/sup 0/C. A critical combination of the solute additions W and Zr led to Zr segregation at grain boundaries during long-term aging which subsequently resulted in embrittlement as indicated by an increase in the ductile-brittle transition temperature below -196/sup 0/C to about -150/sup 0/C.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH
- OSTI ID:
- 7087787
- Journal Information:
- Metallography; (United States), Journal Name: Metallography; (United States) Vol. 10:1; ISSN MEIJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
AGING
ALLOYS
CRYSTAL STRUCTURE
DUCTILITY
GRAIN BOUNDARIES
HAFNIUM ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
MOLYBDENUM BASE ALLOYS
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
TENSILE PROPERTIES
TUNGSTEN ALLOYS
VERY HIGH TEMPERATURE
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS