Abstract
Ti 5Si 3 is one of the candidate materials for very-high-temperature applications. Alloying element additions such as Nb or Cr to Ti 5Si 3 result in alloys with different morphology and properties depending on the alloy design. The Ti 5Si 3-based stoichiometric alloys which can be abbreviated as (Ti, M) 5Si 3 where M=Nb, Cr, are composed of a monolithic Ti 5Si 3 phase and are strengthened by solution hardening. Nb and Cr atoms dissolve in Ti 5Si 3 without changing its phase structure. The solubility of Nb or Cr in Ti 5Si 3 is determined to be at least 21 and 12 at.%, respectively. The off-stoichiometric alloys, whose compositions are Ti 62.5M X Si 37.5− X , display a hypereutectic microstructure with Ti 5Si 3 as the primary phase. The brittleness of the off-stoichiometric alloys is greatly improved compared with the stoichiometric ones. However, due to the weak phase involved, off-stoichiometric alloys appear to have low strength at high temperature and thus are unsuitable for very-high-temperature applications.
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