Fractography Observations of Fatigue Failures in Titanium Alloys.
GRUMMAN AEROSPACE CORP BETHPAGE N Y RESEARCH DEPT
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Fractographic examinations were made on two titanium alloys Ti 6Al 4V and Ti 6Al 2Sn 6V the alloys were subjected to different thermomechanical histories and failed in a constant amplitude fatigue test. Results showed no specific correlation between chemistry of alloy and failure mode however, a clear-cut microstructural dependence of local crack advance was noted. Alpha grain boundaries and alpha-beta interfaces were delineated by the presence of secondary cracks showing their relative weakness. The fracture appearance of these alloys is explained in terms of the localized cyclically work-hardened zone just ahead of the advancing fatigue crack.
- Properties of Metals and Alloys