Abstract
A series of load-relaxation tests and tensile tests were conducted to study the high temperature deformation mechanism of fine duplex gamma TiAl alloy at temperatures ranging from 800 to 105<TEX>$0^{\circ}C$</TEX>. Results of load relaxation test showed that deformation behavior at a small imposed strain (<TEX>$\varepsilon$</TEX>≒0.05) was dominated by dislocation glide and dislocation climb. To investigate the deformation behavior at a large amount of strain, the processing map was constructed using a dynamic materials model. Two domains were characterized in the processing map obtained at a strain level of 0.6. One domain was found at the region of 98<TEX>$0^{\circ}C$</TEX> and <TEX>$10^{-3}/sec$</TEX> with a peak efficiency of 48%, which was identified as a domain of dynamic recrystallization from the microstructural observation. The order was observed at the region of 125<TEX>$0^{\circ}C$</TEX> and <TEX>$10^{-4}/sec$</TEX> with a peak efficiency of 64%. The strain rate sensitivity measured indicates that the material was deformed by the superplasticity in the region.
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