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Iron As A Low-cost Sintering Aid In Ti-6Al-7Nb Processed By MIM

  • : Alexandra Amherd Hidalgo1, Thomas Ebel1, Robert Frykholm2, Efraín Carreño-Morelli3, Florian Pyczak1
  • : 1Helmholtz-Zentrum Geesthacht, 2Höganäs AB, 3University of Applied Sciences and Arts Western Switzerland
  • : PDF Download
  • : 2018

Abstract

Improving mechanical properties without increasing costs is crucial to bring PM components in demanding application fields. One cost-effective strategy to enhance mechanical properties of sintered titanium alloys is the use of iron as a sintering aid. In this work  specimens were manufactured by metal injection moulding (MIM) using pre-alloyed Ti-6Al-7Nb gas-atomised powder and 2 wt.% of fine iron powder. To evaluate the impact of enhanced sintering activity on mechanical properties of MIM Ti-6Al-7Nb by iron addition samples were sintered at 1250 °C and compared with iron free MIM Ti-6Al-7Nb samples sintered at 1350 °C. It was proved that the combination of lower sintering temperatures and iron leads to a strength increase of 100 MPa when compared with pure MIM Ti-6Al-7Nb and elongation values of around 16%. High cycle 4-point bending fatigue results indicate that when iron is used the colony refinement produced by lower sintering temperatures is more relevant than the reduced densification.

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