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Creep resistance of intermetallic TNB-V5 alloy processed by Metal Injection Moulding

  • : Thomas Ebel1, Juliano Soyama, Michael Oehring, Florian Pyczak, Karl Ulrich Kainer
  • : 1Helmholtz-Zentrum Geesthacht
  • : PDF Download
  • : 2014

Abstract

Consisting of hard and brittle intermetallic phases titanium aluminides are difficult to shape. Furthermore, homogenous microstructures are essential for reliable mechanical properties of a component made from titanium aluminides. Thus, the application of powder metallurgical techniques is attractive for the processing of this alloy class. Metal Injection Moulding (MIM) has recently been shown as a competitive technique for processing of titanium aluminides delivering strength and ductility comparable to cast material. However, information about the creep behaviour of titanium aluminides processed by MIM is practically non-existent. Therefore, this study is a primary assessment of the creep resistance of a MIM processed titanium aluminide alloy, TNB-V5 (Ti-45Al-5Nb-0.2B-0.2C, in at.%). The results indicate that the creep resistance of MIM TNB-V5 is superior to the as-cast condition due to the better microstructural homogeneity. Additionally, due to the importance of cooling rates for the microstructure formation and, consequently, the mechanical properties, TNB-V5 was sintered and cooled down at three different rates, namely 10, 50 and 100 K/min. The first value corresponds to typical cooling rates in the range of industrial sinter furnaces, while the latter one provides a reference for fast cooling. The microstructural investigation showed that the colony size increased with decreasing cooling rate. In addition the ductility was reduced by decreasing the cooling rate but an improved creep resistance was achieved due to the larger colony size.
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