Abstract
The beta phase stability of titanium alloys can be generally described by means of molybdenum equivalence (Moeq). In this study, Ti-4Mo-X (1, 2, 3, 4 wt.% Cr or V) alloys were prepared by means of vacuum arc remelting under argon atmosphere in order to enhance the workability of Ti-4Mo-X alloys and corrosion resistance. The corrosion properties, microstructural evolution and plastic workability were investigated following uniaxial cold rolling. The corrosion evaluation was conducted in a standard three-electrode cells in naturally aerated Ringer’s physiological solution at 37±1 ℃. Optical micrograph showed an increase of acicular β phases after cold rolling. XRD results showed a higher intensity of β phase in the cold rolled specimen compared to as-homogenized one. The formation of β phase was responsible for the improved workability of Ti alloys. The maximum reduction ratio of the cold rolled specimens without any presence of cracks were 72.8% and 39.4% for Ti-4Mo-4Cr and Ti-4Mo-4V alloys, respectively. The corrosion properties of the alloy were relatively dependent on the cold rolling. Ti-4Mo-4Cr alloy showed the lowest corrosion current density with 6.71E10-9/cm2.
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