Mechanical properties and microstructural evolution of nanocrystalline titanium at elevated temperatures

Authors: Shahmir, H., Pereira, P.H.R., Huang, Y. and Langdon, T.G.

Journal: Materials Science and Engineering: A

Volume: 669

Pages: 358-366

ISSN: 0921-5093

DOI: 10.1016/j.msea.2016.05.105

Abstract:

An investigation was initiated to study the mechanical properties and microstructural evolution of nanocrystalline titanium in the temperature range of 473–923 K after processing by high-pressure torsion (HPT) under a pressure of 5.0 GPa for up to 10 turns. The results show there is a significant improvement in both the tensile strength and the ductility in nanocrystalline Ti by comparison with coarse-grained (CG) Ti at elevated temperatures. The strength of HPT-processed Ti drops to that of CG Ti at temperatures above 773 K because of grain growth. An investigation of the mechanical behavior at elevated temperatures reveals an increasing-decreasing-increasing trend in the elongations to failure with increasing temperature. An elongation of >130% was achieved both at 673 K and above 773 K for the HPT-processed samples and this was significantly larger than for the CG Ti. The highest measured elongation was ~200% for the HPT-processed sample tested at 923 K. A good combination of strength and elongation to failure was achieved in the temperature range of 573–773 K after HPT processing.

Source: Scopus

Mechanical properties and microstructural evolution of nanocrystalline titanium at elevated temperatures

Authors: Shahmir, H., Pereira, P.H.R., Huang, Y. and Langdon, T.G.

Journal: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Volume: 669

Pages: 358-366

eISSN: 1873-4936

ISSN: 0921-5093

DOI: 10.1016/j.msea.2016.05.105

Source: Web of Science (Lite)