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

Personal Author(s):

• Ramamurty, U.
• Sen, Indrani
• Miracle, D.
• Tamirisa, S.

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.

Descriptors:

• *TITANIUM ALLOYS
• INDIA
• FRACTURE(MECHANICS)
• FATIGUE
• MICROCRACKING
• BORON
• MICROMECHANICS
• GRAIN STRUCTURES(METALLURGY)

Subject Categories:

• Metallurgy and Metallography
• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE