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An investigation of the fatigue and fracture behavior of multicomponent Nb-11Al-41Ti-1.5Mo-1.5Crintermetallic.
- Source :
- Journal of Materials Science; Aug1999, Vol. 34 Issue 15, p3567-3575, 9p
- Publication Year :
- 1999
-
Abstract
- This paper presents the results of a recent study of the fracture and fatigue crack growth behavior of a newly developed multicomponent niobium aluminide intermetallic Nb-11Al-41Ti-1.5Mo-1.5Cr alloy (compositions quoted in at % unless stated otherwise). The alloy is shown to have attractive combinations of room-temperature tensile ductility (approx. 11%) and fracture toughness (approx. scds 83 MPa $$\sqrt m $$ ) in the as-forged condition. However, the tensile properties and fracture toughness are degraded somewhat by direct aging at 750 °C for 25 h. The direct aged Nb-11Al-41Ti-1.5Mo-1.5Cr intermetallic is also shown to have comparable fatigue crack growth resistance to pure Nb, IN 718 and mill annealed Ti-6Al-4V at room- and elevated-temperature. Fatigue and fracture mechanisms are elucidated prior to a discussion of the implications of the current results for potential high temperature structural applications. [ABSTRACT FROM AUTHOR]
- Subjects :
- INTERMETALLIC compounds
FRACTURE mechanics
NIOBIUM
METAL fatigue
HIGH temperatures
Subjects
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 34
- Issue :
- 15
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 52536947
- Full Text :
- https://doi.org/10.1023/A:1004638714983