Effects of environment and heat treatment on the tensile and fatigue properties of Ti-24 at%Al-11 at%Nb

The alpha sub 2 + beta alloy Ti-24 at.% Al-11 at.% Nb was evaluated for mechanical properties in the as-received, mill annealed condition (nearly equiaxed) and in the beta annealed condition (basketweave). The as-received condition had a moderately strong basal transverse alpha sub 2 texture which g...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 1996, Vol.19 (11), p.1339-1355
Main Authors: FOX, T. R, KNORR, D. B, STOLOFF, N. S
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Fatigue
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
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Summary:The alpha sub 2 + beta alloy Ti-24 at.% Al-11 at.% Nb was evaluated for mechanical properties in the as-received, mill annealed condition (nearly equiaxed) and in the beta annealed condition (basketweave). The as-received condition had a moderately strong basal transverse alpha sub 2 texture which gave a higher yield strength, higher elastic modulus, and higher fatigue crack growth rate (FCGR) for loading in the transverse direction at room temperature. The beta annealed material was stronger and more isotropic in both texture and properties. The fatigue crack growth rate is higher at 732 deg C in argon than at room temperature. A hydrogen environment results in a FCGR at 732 deg C comparable to or less than the FCGR in argon at 732 deg C for the as-received and beta annealed conditions respectively. Although the hydrogen in solution at levels as high as several thousand ppm does not embrittle at elevated temperature, embrittlement is found after cooling to room temperature.
ISSN:8756-758X
1460-2695
DOI:10.1111/j.1460-2695.1996.tb00171.x