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Metal Injection Moulding (MIM) Of Ti-6Al-4V HDH-Powder With High Oxygen Content Achieving High Strength And High Ductility By Addition Of Yttrium

  • : Wolfgang Limberg1, Thomas Ebel1, Florian Pyczak1, Regine Willumeit-Römer1
  • : 1Helmholtz-Zentrum-Geesthacht
  • : PDF Download
  • : 2018

Abstract

In order to reduce the costs of powders in MIM processing a mixture of 80% Hydride-Dehydride (HDH) Ti-6Al-4V powder with high oxygen content (4200 µg/g) and 20% gas atomized Ti-6Al-4V powder with 1600 µg/g oxygen was investigated. Particle size of both powders was < 45 µm. Tensile test specimens were produced by MIM using 12 wt.% binder. Residual porosity after sintering for two hours at 1400 °C was only 1.2%. Due to the high oxygen content of the powder mixture the specimens achieved high strength (YS: 889 MPa UTS: 994 MPa) but low ductility (4.5%). By addition of 0.5 wt.% yttrium powder with a particle size < 45 µm to the powder mixture corresponding scavenging of oxygen resulted in increase of ductility to 13.5% while the ultimate tensile strength decreased to 939 MPa which is a still high value for as sintered MIM-processed Ti-6Al-4V. The residual porosity increased to 1.9%.

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