An Investigation of Hardness Homogeneity and Microstructure in Pure Titanium Processed by High Pressure Torsion

Abstract:

High-pressure torsion (HPT) was conducted on disks of commercial purity Ti under applied pressures of 3 and 6 GPa. Measurements of the Vickers microhardness showed improving hardness homogeneity with increasing numbers of HPT turns. Transmission electron microscopy demonstrated that a higher HPT pressure leads to a smaller grain size after straining and these grains contain a high dislocation density with arrays of twins. This is consistent with the higher hardness of the Ti samples processed by HPT under 6 GPa pressure.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 2701-2706
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.2701
• Online since: May 2014
• Authors: Chuan Ting Wang*, Alan G. Fox, Terence Langdon
• Keywords: High-Pressure Torsion, Homogeneity, Microstructure, Titanium, Ultrafine Grain

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