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EFFECTS OF ENVIRONMENT AND HEAT TREATMENT ON THE TENSILE AND FATIGUE PROPERTIES OF Ti‐24 at%A1‐11 at%Nb
Author(s) -
Fox T. R.,
Knorr D. B.,
Stoloff N. S.
Publication year - 1996
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1996.tb00171.x
Subject(s) - materials science , equiaxed crystals , ultimate tensile strength , metallurgy , alloy , composite material
The α 2 +β alloy Ti‐24 at%A1‐11 at%Nb was evaluated for mechanical properties in the as‐received, mill annealed condition (nearly equiaxed) and in the β annealed condition (basketweave). The as‐received condition had a moderately strong basal transverse α 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 β annealed material was stronger and more isotropic in both texture and properties. The fatigue crack growth rate is higher at 732°C in argon than at room temperature. A hydrogen environment results in a FCGR at 732°C comparable to or less than the FCGR in argon at 732°C for the as‐received and β 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.