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Microstructure and Hardness of Ti-Based Alloys with Co and Cr

In this paper the effects of cobalt and chromium additions on the microstructure and hardness of as-cast titanium-based alloys was investigated. Ten specimens of Ti-Co-Cr alloys with titanium content ranging from 50 to 80 at. % were prepared by melting the pure elements in a laboratory arc-furnace under argon atmosphere. The microstructure of the as-cast samples was observed by optical microscope. Microphotographs were taken with digital camera and analyzed with the corresponding programmes. Hardness was measured by Vickers method (HV3). Optical microscopy shows that almost all samples have two-phases microstructure, which consists of dendritic and interdendritic region. Only one sample has a three phases microstructure. From the results of a quantitative metallography can be seen that the content of phases depends on alloy composition. Hardness measurements indicate that hardness increases with the content of dendritic phase.

Ti-Co-Cr as-cast alloys; microstructure; hardness

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