Discontinuous dynamic recrystallization of TiNb alloys: Experiment and cellular automaton simulation

Abstract

TiNb alloys are widely used in the field of cryogenic superconductivity because of their excellent plasticity, machinability and superconductivity. As a common softening behavior in the process of material processing, dynamic recrystallization (DRX) has a considerable effect on the microstructure and the properties of material. The discontinuous dynamic recrystallization (DDRX) behavior of TiNb alloys during hot compression has been studied by combining experiment with cellular automaton (CA) simulation in this paper. It can be found that CA model can effectively predict DDRX behavior of TiNb alloy. The mean grain size and the volume fraction for DDRX of TiNb alloys increase with increasing deformation temperature, but they decrease with increasing strain rate. Furthermore, the serrated grain boundaries and the nucleation points of recrystallized grains in the deformed TiNb samples are in accordance with the characteristics of grain boundary bulging mechanism. In addition, the random orientation effect of DDRX grains is helpful to weaken the intensity of deformation texture in TiNb alloys.

Keywords

TiNb alloy / plastic deformation / dynamic recrystallization / cellular automaton / texture

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