Effect of Oxygen on High‐temperature Phase Equilibria in Ternary Ti‐Al‐Nb Alloys | Zendy

Distl Benedikt | Zendy; Dehm Gerhard | Zendy; Stein Frank | Zendy

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Effect of Oxygen on High‐temperature Phase Equilibria in Ternary Ti‐Al‐Nb Alloys

Author(s) -

Distl Benedikt,

Dehm Gerhard,

Stein Frank

Publication year - 2020

Publication title -

zeitschrift für anorganische und allgemeine chemie

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.354

H-Index - 66

eISSN - 1521-3749

pISSN - 0044-2313

DOI - 10.1002/zaac.202000098

Subject(s) - ternary operation , materials science , impurity , titanium , microstructure , superalloy , phase (matter) , metallurgy , oxygen , octahedron , titanium alloy , thermodynamics , crystallography , crystal structure , alloy , chemistry , physics , organic chemistry , computer science , programming language

Alloys based on titanium aluminides received a lot of attention because of their capability to substitute Ni‐based superalloys in high‐temperature applications. However, the phase equilibria between the main microstructure constituents (αTi), (βTi), γ (TiAl) and α 2 (Ti 3 Al) can be shifted significantly by impurities such as oxygen especially at high temperatures. This behavior is investigated on the tie‐triangle (αTi) + (βTi) + γ (TiAl) in the ternary Ti‐Al‐Nb system at 1300 °C. An explanation for this behavior could be the occupation of octahedral voids by impurities in certain phases.

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