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Hot Deformation Behavior and Microstructure Evolution of a TiBw/Near α-Ti Composite with Fine Matrix Microstructure

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Inner Mongolia Metallic Materials Research Institute, Ningbo 315103, China
Department of Chemical and Materials Engineering, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Victoria Wellington, PO Box 600, Wellington 6140, New Zealand
Authors to whom correspondence should be addressed.
Metals 2019, 9(4), 481;
Received: 25 March 2019 / Revised: 23 April 2019 / Accepted: 24 April 2019 / Published: 25 April 2019
(This article belongs to the Special Issue Titanium Alloys: Processing and Properties)
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The hot deformation behavior and microstructure evolution of a 7.5 vol.% TiBw/near α-Ti composite with fine matrix microstructure were investigated under the deformation conditions in a temperature range of 800–950 °C and strain rate range of 0.001–1 s−1 using plane strain compression tests. The flow stress curves show different characteristics according to the various deformation conditions. At a higher strain rate (1 s−1), the flow stress of the composite continuously increases until a peak value is reached. The activation energy is 410.40 kJ/mol, much lower than the activation energy of as-sintered or as-forged composites. The decreased activation energy is ascribed to the breaking of the TiBw reinforcement during the multi-directional forging and the resultant fine matrix microstructure. Refined reinforcement and refined matrix microstructure significantly improve the hot deformation ability of the composite. The deformation conditions determine the morphology and fraction of α and β phases. At 800–900 °C and 0.01 s−1 the matrix α grains are much refined due to the continuous dynamic recrystallization (CDRX). The processing map is constructed based on the hot deformation behavior and microstructure evolution. The optimal hot processing window is determined to be 800–950 °C/0.001–0.01 s−1, which lead to CDRX of primary α grains or dynamic recovery (DRV) and dynamic recrystallization (DRX) of β phase. View Full-Text
Keywords: titanium matrix composites; hot deformation behavior; microstructure evolution; processing map titanium matrix composites; hot deformation behavior; microstructure evolution; processing map

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Zhang, C.; Lian, Y.; Chen, Y.; Sun, Y.; Zhang, S.; Feng, H.; Zhou, Y.; Cao, P. Hot Deformation Behavior and Microstructure Evolution of a TiBw/Near α-Ti Composite with Fine Matrix Microstructure. Metals 2019, 9, 481.

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