Abstract
In the present work, the hot deformation behavior, dynamic recovery, dynamic recrystallization and texture evolution of Ti-22Al-25Nb alloy on the conditions of 1100°C with four different thickness reductions (35%, 50%, 65% and 80%) are investigated by isothermal compression testing on Gleeble-3500 thermo-mechanical simulator. The strain rate is 0.1mm/s-1. Subsequently, metallographic observation and EBSD analysis are carried out. The results show that during the hot deformation, the dynamic recovery (DRV) and dynamic recrystallization (DRX) strongly affect the microstructure and texture evolution. It is observed that with the strain increasing, the intensity of ηbcc-fiber increases firstly (crystallographic fiber axis <100> parallel to the compression direction). When the thickness reduction reaches to 80%, the intensity of <001> pole becomes stronger expectedly. Whereas the ηbcc-fiber transform into cube components ({100} <001>) unexpectedly. In addition, as the strain increases through 35%-80%, the fraction of large misorientation grain boundaries and fraction of DRX grains gradually increase due to continuous recrystallization. The evolution mechanism of grain orientations and texture during the DRX process will be discussed.
Highlights
Ti2AlNb based alloys have gained great popularity in the aerospace industry [1,2,3,4,5]
Studies have found that dynamic recovery and dynamic recrystallization occur in Ti2AlNb-based alloys during hot deformation, and which could make the intensity of texture weaker
From figure (a) to figure (d), with the thickness reductions increase in turn, grains are gradually flattened
Summary
Ti2AlNb based alloys have gained great popularity in the aerospace industry [1,2,3,4,5] This new lowdensity high-temperature intermetallic compound material has higher high-temperature strength and high-temperature creep resistance than general titanium alloys. It has low linear expansion coefficient, nonmagnetic property and high flame retardancy [4,5,6] It can be used at 650 °C ~ 750 °C for a long time or at a higher temperature for a short time. Studies have found that dynamic recovery and dynamic recrystallization occur in Ti2AlNb-based alloys during hot deformation, and which could make the intensity of texture weaker
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