Influence of ? phase precipitation on mechanical performance and corrosion resistance of Ti
By Li, Qiang; Li, Junjie; Ma, Guanghao; Liu, Xuyan; Pan, Deng
Published in Materials & Design
NULL
2016
Abstract
Abstract A recently investigated Ti-24 at.% Nb-2 at.% 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 ? 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 ? phase and texture. The Ti-24 at.% Nb-2 at.% 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 ? phase, owing to an unstable passive film.
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