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Metals 2017, 7(11), 498; doi:10.3390/met7110498

Investigation of the Deformation Mechanism of a near β Titanium Alloy through Isothermal Compression

1
School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
School of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
3
Department of Chemical and Materials Engineering, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
*
Authors to whom correspondence should be addressed.
Received: 17 October 2017 / Revised: 3 November 2017 / Accepted: 7 November 2017 / Published: 12 November 2017
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Abstract

This study investigated the hot deformation behavior of Ti-4Al-1Sn-2Zr-5Mo-8V-2.5Cr alloy through isothermal compression tests at temperatures from 780 to 930 °C with strain rates ranging from 0.001 to 1 s−1. The flow stress decreases with a decreased strain rate and an increased temperature. A constitutive equation was established for this alloy and the dependence of activation energy on temperature and strain rate is discussed. We further proposed a processing map using the dynamic materials model. On the processing map various domains of flow stability and flow instability can be identified. The deformation mechanisms associated with flow stability regions are mainly dynamic recrystallization (DRX) and dynamic recovery (DRV). The flow instability is manifested in the form of the band of flow localizations. The optimum processing conditions are suggested such that the temperature range is from 780 to 880 °C and the strain rate ranges from 0.001 to 0.01 s−1. View Full-Text
Keywords: isothermal compression; true strain-stress curves; constitutive equation; processing map isothermal compression; true strain-stress curves; constitutive equation; processing map
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wu, J.; Lü, Z.; Zhang, C.; Han, J.; Zhang, H.; Zhang, S.; Hayat, M.; Cao, P. Investigation of the Deformation Mechanism of a near β Titanium Alloy through Isothermal Compression. Metals 2017, 7, 498.

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