Dynamic fracture characteristics of injection molded titanium alloy compacts

Toshiko Osada, Hideshi Miura

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Dynamic fracture characteristics are important for the application of titanium and its alloys in various industrial fields. The fatigue properties of metal injection molded (MIM) titanium and Ti-6Al-4V * compacts were evaluated. Fatigue strength in rotating bending was found to be about one-third of the static tensile strength; this is attributed to cracking initiated at surface pores. With the addition of chromium or TiB2 to Ti-6Al-4V, the sintered compacts exhibited a fine grain size, resulting in higher fatigue strength. Hot isostatic pressing (HIP) was used to further consolidate chromium-containing Ti-6Al-4V, resulting in ≥99% of the pore-free density (PFD) and an attendant fatigue strength >350 MPa. Crackpropagation behavior was studied by surface replication of Ti-6Al-4V specimens containing chromium at 80% fatigue life to understand the role of residual porosity. Surface cracks were present running from pore to pore, thereby limiting fatigue strength.

Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalInternational Journal of Powder Metallurgy
Issue number1
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Industrial and Manufacturing Engineering


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