Dynamic recrystallization behavior of the Ti–48Al–2Cr–2Nb alloy during isothermal hot deformation

Publication date: Available online 3 October 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Xiaofei Chen, Bin Tang, Yan Liu, Xiangyi Xue, Lei Li, Hongchao Kou, Jinshan LiAbstractThe hot deformation behavior of the as-cast Ti–48Al–2Cr–2Nb alloy was investigated by isothermal compression tests at deformation temperatures ranging from 1000 °C to 1200 °C, and strain rates from 0.001 s−1 to 0.1 s−1. The single peak stress features common to all flow curves indicate that DRX is the dominating softening mechanism. The calculated values of the hot deformation activation energy Q and stress index n are 296.5 kJ mol−1 and 3.97, respectively. Based on this, the Arrhenius type constitutive equation was successfully established. The DRX critical condition model and relationship among DRX volume fractions, deformation temperatures and strain rates were obtained to optimize the process. Combined with microstructure analysis, it's concluded that 1200 °C/0.01s−1 is the optimization parameter. Besides, both DDRX and CDRX were observed in the γ phase evolution. The deformation mechanism from the inter-grain dislocation motion to the grain boundary migration and grain rotation was discussed.Graphical abstract
Source: Progress in Natural Science: Materials International - Category: Materials Science Source Type: research