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Accession Number:
ADA455948
Title:
Fatigue and Fracture Behavior of Affordable Ti-B Alloys
Descriptive Note:
Final rept. 23 May-2 Aug 2006
Corporate Author:
INDIAN INST OF SCIENCE BANGALORE (INDIA) DEPT OF METALLURGY
Report Date:
2006-04-01
Pagination or Media Count:
21.0
Abstract:
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.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE