Fatigue and Fracture Behavior of Affordable Ti-B Alloys

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.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2006
Accession Number
ADA455948

Entities

People

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

Organizations

  • Indian Institute of Science, Bengaluru

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Grain Boundaries
  • Grain Size
  • Hardening
  • Hardness
  • Materials
  • Measurement
  • Mechanical Properties
  • Stress Intensity Factors
  • Stresses
  • Surface Roughness
  • Tensile Properties
  • Tensile Strength
  • Tensile Stress
  • Tensile Testing
  • Toughness

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.