Influence of ω phase precipitation on mechanical performance and corrosion resistance of Ti–Nb–Zr alloy

Publication date: 5 December 2016
Source:Materials & Design, Volume 111
Author(s): Qiang Li, Junjie Li, Guanghao Ma, Xuyan Liu, Deng Pan
A recently investigated Ti–24at.% Nb–2at.% Zr alloy was cold-rolled with reductions of 75% and 95%, and the resulting materials were heat-treated under the same conditions. The two types of specimens obtained through this procedure show the same phase composition. Precipitation of an isothermal ω phase leads to some improvement in the properties of the 75%-rolled specimens. The 95%-rolled and subsequently heated specimens exhibit different performances compared to the 75%-rolled samples heated under the same processing conditions. The stress-induced martensitic transformation is inhibited in the 95%-rolled specimens, owing to the combined effects of the isothermal ω phase and texture. The Ti–24at.% Nb–2at.% Zr alloy shows open circuit potential and corrosion behavior similar to commercially pure Ti. The corrosion resistance of the alloy is reduced upon precipitation of the ω phase, owing to an unstable passive film.

Graphical abstract

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