α ↔ β changes in Ti-6A1-2Sn-4Zr-2Mo-Si alloy: Characterization,microstructure,and mechanical properties

Abstract

In a Ti-6Al-2Sn-4Zr-2Mo-Si alloy, α ↔ β transformation kinetics and other transformation characteristics and its influence on subsequent cooling transformations have been evaluated by differential and dilatometric thermal analysis, hardness and conductivity measurements, and metallographic observation, after performing controlled thermal treatments. Starting from the mill annealed condition, samples were heated at temperatures between 650 and 1060 °C for 1 h, then water quenched, and subsequently heated at 565 °C for 8 h, air cooled. The mechanical properties of samples heat treated as indicated have also been obtained. Finally, the validity of hardness and conductivity measurements and tensile test results as a control method for the correct solution treatment (and the primary α percentage) has been studied.

Keywords

titanium alloys heat treatment transformation dilatometry differential thermal analysis mechanical properties

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