Effect of Fe or Cr addition on the strengthening Ti-6Al-4V alloy by metal injection molding

Yoshinori Itoh, Toshiaki Uematsu, Kenji Sato, Hideshi Miura, Mitsuo Niinomi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


It has been found that the sintered MIM Ti-6Al-4V alloy compacts were strengthened by addition of fine Mo powder because of the microstructural modification. In this study, the metal injection molding process has been applied to strengthen Ti-6Al-4V compacts by addition of Fe or Cr powders, which are the same beta stabilizing elements as Mo and are more cost effective powders as compared to Mo powder. The effect of Fe or Cr contents and sintering conditions on the mechanical properties, oxygen content and microstnictures of the sintered compacts were mainly investigated. The microstnictures of sintered compacts were consisted of acicular alpha phase and intergranular beta phase, and the acicular alpha phase showed fine with increasing Cr content. The tensile strength of sintered compacts was increased with increasing Fe or Cr contents, and the effect of Fe addition for strengthening the sintered compacts was larger than Cr or Mo addition. Eventually, the tensile strength of sintered compacts added 2mass% of Fe was improved to be 1O1OMPa with 11.2% of elongation, and the compacts added 4mass% of Cr showed the excellent tensile strength of 1040 MPa with 16.1 % of elongation.

Original languageEnglish
Pages (from-to)253-258
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number5
Publication statusPublished - 2009 May


  • Mechanical property
  • Metal injection molding
  • Mixed powder
  • Strengthening
  • Ti-6Al-4V

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry


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