Abstract
To understand the influence of composition on the oxidation of the Ti–Mo system, a combinatorial approach was adopted whereby a compositionally graded specimen, Ti–xMo (0⩽x⩽12wt%), was prepared and oxidized at 650°C. The results show that the scale thickness is independent of the composition and a parabolic law is obeyed in the composition-time domain. An increase in the Mo content degrades the adhesion of the scale by forming a TiO transition layer. Some of the observations including the homogeneous nucleation of β for compositions <∼7.5wt% Mo and discontinuous precipitation for compositions >∼7.5wt% Mo in the subsurface region have not been previously reported.
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