Analysis of hot deformation behavior of Al 5083-TiC nanocomposite using constitutive and dynamic material models

摘要

Hot deformation experiments were carried out on Al 5083-2%TiC nanocomposite samples to analyse and establish the relation between the microstructural behavior and control process parameters such as temperature, strain and strain-rate. Hot deformation was carried out at a temperature range of 250-450 ℃ and strain rate range of 0.01-1.0 s~(-1). Using Dynamic Material Model (DMM), dissipation efficiency for each set of control parameters was calculated. The processing map of the Al based nanocomposite was developed superimposing the instability map over dissipation efficiency map in the temperature and strain rate space. Different deformation mechanisms such as Dynamic Recrystallization (DRX) Dynamic Recovery and flow localization were validated by the manifestation of many microstructural features after deformation. Adiabatic shear band formation was observed at higher strain rates.