On the stability of Ti(Mn,Al)2 C14 Laves phase in an intermetallic Ti–42Al–5Mn alloy

• DOI: 10.1016/j.intermet.2023.107962
• Publication Date: 2023-06-11T14:49:39Z
• Authors: Gloria Graf; Malina Seyffertitz; Petra Spoerk-Erdely; Helmut Clemens; Andreas Stark; Lukas Hatzenbichler; David Holec; Michael Burtscher; Daniel Kiener; Xiaobing Li; Kui Liu
• Keywords: Laves phase; Titanium alloy; Ductility (Earth science)

In order to facilitate a more widespread use of intermetallic γ-TiAl based alloys in the aircraft and automotive sector, recent research focuses on development low-cost titanium aluminides. The strong β-stabilizing effect as well increased ductility upon Mn addition renders this alloying element promising candidate fully or partially substitute other, expensive, elements such Mo, Ta Nb. Mn-containing alloys, however, are prone formation undesired, brittle Ti(Mn,Al)2 C14 Laves phase during long-term exposure at targeted service temperatures, which can deteriorate ambient temperatures. study, transformation kinetics chemical thermal existence range Ti–42Al–5Mn (at.%) alloy were investigated by complementary experimental computational approaches. situ ex high-energy X-ray diffraction combination with microstructural investigations used study occurrence possible course annealing treatments. stability was addressed analysis conjunction ab initio modeling. Using these combined approaches, critical local concentration ∼16 at.% for within lamellar α2 ∼17 βo determined. These results should be critically considered future design advanced alloys.