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Fatigue and Fracture Behavior of Affordable Ti-B Alloys
Final rept. 23 May-2 Aug 2006
INDIAN INST OF SCIENCE BANGALORE (INDIA) DEPT OF METALLURGY
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In this project, we have examined the mechanical properties of the Ti-6Al-4V alloy with varying amounts of B content. The cast and HIPed alloys with 0.05, 0.10 and 0.4 wt. B additions were supplied by Tamirisa and Miracle of AFRL, WPAFB. Microstructural observations indicate that the B addition reduces the as-cast grain size dramatically. Concomitantly, an increase in the yield and ultimate tensile strengths was observed. Fracture toughness measurements indicate a reduction in KIc values with increasing B content, owing primarily to the reduced grain size. Fatigue crack growth measurements show a gradual reduction in threshold for fatigue crack initiation. Fractographic analyses were conducted to examine the micromechanical reasons for the observed trends.
APPROVED FOR PUBLIC RELEASE