Fabrication of high strength α+β type titanium alloy compacts by metal injection molding

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

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

In the previous papers, the sintered Ti-6Al-2Sn-4Zr-2Mo alloy compacts showed higher tensile strength than the Ti-6Al-4V alloy compacts, and the strengthening of Ti-6Al-4V alloy compacts were available by addition of fine Mo powder because of fine microstructural modification. In this study, the metal injection molding process was applied to produce the high strength α+β type titanium alloy compacts by addition of 4 mass% Mo on the Ti-6Al-2Sn-4Zr-2Mo alloy compacts using Ti, Al-based pre-alloy and Mo powders. The effect of sintering conditions on the relative density, mechanical properties and oxygen content of the compacts were mainly investigated. The relative density and tensile strength of sintered compacts were increased with increasing the sintering temperature and time, and reached up to 98% relative density and 1000 MPa tensile strength by sintering at 1473 K for 28.8 ks. But the elongation of sintered compacts was below 10% at lower sintering temperature for short time or higher sintering temperature for long time. The microstructures of sintered compacts were consisted of acicular a and intergranular β phases, and the acicular α phase was finer than that of Ti-6Al-2Sn-4Zr-2Mo alloy compacts. Eventually, the tensile strength of Ti-6Al-2Sn-4Zr-6Mo alloy compact was reached up to 1010 MPa with 14.7% of elongation by lower sintering temperature with prolonged sintering time.

Original languageEnglish
Pages (from-to)720-725
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume55
Issue number10
DOIs
Publication statusPublished - 2008 Oct

Keywords

  • Mechanical properties
  • Metal injection molding
  • Mixed powder
  • Ti-6Al-2Sn-4Zr-6Mo alloy
  • α+β type titanium alloy

ASJC Scopus subject areas

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

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