Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 730, Issue -, Pages 533-543Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.10.001
Keywords
Microstructure evolution; Basketweave microstructure; Deformation behavior; Processing maps; Mechanisms
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Funding
- National Natural Science Foundation of China [51275416, 51505386]
- China Postdoctoral Science Foundation [2014M562447]
- Fundamental Research Funds for the Central University [3102017GX06003]
- State Key Laboratory of Solidification Processing (NWPU), China [KP201513, 16-BZ-2015]
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The strain rate sensitivity exponent, strain hardening exponent and apparent activation energy were calculated and the processing maps of isothermally compressed TC17 titanium alloy with basketweave microstructure were established. The influence of microstructure evolution and deformation mechanisms was investigated via the high-resolution electron backscatter diffraction and transmission electron microscope. The interaction effect among globularization of alpha platelets, alpha to beta phase transformation and deformation mechanisms resulted in the different variation in strain rate sensitivity exponent at the strain rates ranging from 0.0002 s(-1) to 0.1 s(-1). The apparent activation energy decreased with an increase in strain and the average value was 374.3 +/- 47.61 kJ mol(-1). The maximum efficiency of power dissipation at 1093 K and 0.0002 s(-1) was obtained and respectively reached to 0.62, 0.65, 0.56 and 0.61 at the strains of 0.1, 0.2, 0.3 and 0.4. (C) 2017 Elsevier B.V. All rights reserved.
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