Effect of hot compression on the microstructure evolution of aluminium bronze alloy

This work aims to study the flow behaviour, phase transformation, and microstructure evolution of aluminium bronze (Cu-9Al-4Fe) alloy. The hot compression behaviour of aluminium bronze were studied using simulator isothermal hot compression tests investigated at strain rates of 0.01-10 s(-1) and temperature of 500-800 degrees C. According to the construction of constitutive equation and three-dimensional hot processing maps, the activation energy was 275.64 kJ/mol. The precipitated fine kappa(?) particles during hot compression inhibit grain growth; the coarse kappa(?) particles promote dynamic recrystallization through the mechanism of particle-stimulated nucleation (PSN). The formation of deformation twins under the influence of the fine kappa(?) particles and high-density annealing twins are formed by stacking fault energy (SFE). Phase transformation by hot compression of the material at 500-800 degrees C, where the structure consists of the alpha phase and (alpha + gamma(2)) eutectoid structure to alpha + beta phase, is important for the increase in the power dissipation factor. Adiabatic shear leads to wedge-shaped cracks at 500 degrees C and 600 degrees C, 10 s(-1), which pass through the (alpha + gamma(2)) eutectoid structure and alpha phase interface with coarse-phase particles. The discontinuous dynamic recrystallization (DDRX) mechanism is the dominant DRX mechanism for aluminium bronze, in which DDRX, characterized by grain boundary bulging, was activated. The strengthening mechanism of aluminium bronze includes dispersion strengthening, twin strengthening, and grain refining strengthening during hot deformation, which leads to the increased activation energy of aluminium bronze alloy. (C) 2022 The Authors. Published by Elsevier B.V.