A constitutive model for predicting flow stress of Al18B4O33w/AZ91D composite during hot compression and its validation

► Obvious dependence of flow stress on strain during hot deformation of Al18B4O33w/Mg composite was founded. ► A comprehensive constitutive equation to describe the relationship between flow stress and strain rate, temperature, strain was established. ► The constitutive equation was proved valid for FE simulation of hot deformation process for the composite.