Open Access Conference Proceedings

Ti15Mo metastable β-Ti alloy was subjected to severe plastic deformation by high pressure torsion. The microstructure and chemical composition of the studied Ti15Mo alloy was investigated by scanning electron microscope. Furthermore, the microhardness of the non-deformed and deformed material was measured which was influenced by the local features of their microstructure.The solution treated Ti15Mo alloy after ageing contains acicular α-phase particles along grain boundaries and in the interior of the β-grains. The aged and deformed alloy exhibits an ultra-fine grained duplex (α+β) microstructure. The equiaxed and submicrometer size α-phase particles form by diffusion via expelling a β stabilizer element (in our case Mo). Therefore, the slight difference in the chemical composition can significantly affect the morphology of the α-phase precipitation. The microhardness measurement revealed a remarkable increase of the microhardness of the HPT-deformed Ti15Mo alloy in α+β condition.

Keywords: Metastable beta titanium alloys, high pressure torsion, phase transformations, alpha phase precipitation

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