Hot deformation and processing maps of titanium matrix composite
(1. School of Materials Science and Engineering, Xi’an University of Architectural and Technology,
Xi’an 710055, China；
2. Titanium Research Center, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China)
Xi’an 710055, China；
2. Titanium Research Center, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China)
Abstract: The hot deformation characteristics of TiC particles reinforced titanium matrix composite were studied in the temperature range from 900 ℃ to 1 150 ℃ and in the strain rate range of 10−3−10 s−1 by compression tests with Gleeble1500 simulator system. The flow behavior was described by the hyperbolic sine constitutive equation, and an average activation energy of 436.72 kJ/mol was calculated. The processing maps were calculated and analyzed according to the dynamic materials model. The maps show domains in some combinations of temperatures and strain rates and these domains are correlated with specific microstructural processes occurring during hot deformation by metallographic investigations and kinetic analysis. At the low strain rate domain occurs in the temperature range of 900−960 ℃ and strain rate range of 0.001−0.03 s−1 superplasticity and dynamic recrystallization were observed. At a high strain rate domain occurs in the temperature range of 980−1 120 ℃ and strain rate range of 0.1−10 s−1 the β phase undergoes dynamic recrystallization. Also, at a strain rate range of 0.1−10 s−1 and the temperature range of 900−930 ℃, the material exhibits flow localization.
Key words: titanium matrix composite; hot deformation; processing map