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Effects of Temperature and Strain Rate on Compressive Mechanical Properties of Ultrafine-Grained CP Titanium

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Abstract:

Ultrafine-grained (UFG) CP Ti were successfully prepared by Equal Channel Angular Extrusion (ECAE) at 390°C~400°C, small than 0.5 um in size. The compressive tests for coarse grain (CG) and UFG Ti were carried out at room temperature (RT) and 77K. UFG Ti showed excellent ductility and higher strength than CG Ti at RT and 77 K. The strain hardening of UFG Ti was improved at 77 K. The compressive ultimate strengths of CG Ti and UFG Ti were both enhanced as the strain rate increased, but CG Ti showed more obvious temperature and strain rate dependence of flow stress, comparing with UFG Ti. When the strain rate increased to 1×10-1/s, the compressive ultimate strength of UFG Ti was kept almost constant, while the ultimate strength of CG Ti increased to the strength level of UFG Ti.

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Periodical:

Advanced Materials Research (Volumes 26-28)

Pages:

381-384

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.26-28.381

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Online since:

October 2007

Authors:

Zhi Guo Fan, Chao Ying Xie

Keywords:

CPTi, Equal Channel Angular Extrusion (ECAE), Strain Rate Sensitivity (SRS), Temperature Dependence, Ultrafine Grained

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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