Mechanical behavior and microstructure properties of titanium powder consolidated by high-pressure torsion
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Research was conducted to investigate the potential for consolidating titanium powder using high-pressure torsion (HPT) at room temperature. The nanostructured samples processed by HPT were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show there is a significant refinement of the Ti powder and it consolidates into bulk nanostructured titanium with a mean grain size estimated by TEM as ~200–300 nm and a mean crystallite size measured by XRD as ~20–30 nm. Microhardness measurements and tensile testing show high strength and low ductility after consolidation under a pressure of 6.0 GPa for 5 revolutions. Additional short annealing at a temperature of 300 °C for 10 min leads to a significant enhancement in ductility while maintaining the high strength.
CitationZhilyaev, A., Ringot, G., Huang, Y., Cabrera, J., Langdon, T. Mechanical behavior and microstructure properties of titanium powder consolidated by high-pressure torsion. "Materials science and engineering A. Structural materials properties microstructure and processing", Març 2017, vol. 688, p. 498-504.