부산대학교 도서관

Achieving superior properties in hot working demands the integration of constitutive modeling, precise microstructure control, and the rigorous identification of safe and efficient conditions. To address this, a powder metallurgy Al–Zn–Mg alloy underwent isothermal compression tests under conditions of 300–500 °C and 0.1–0.0001 s−1. The experimental outcomes indicate that the flow stress of the Al–Zn–Mg alloy exhibits dynamic recrystallization as the predominant softening mechanism observed across all investigated hot working parameters. An Arrhenius-type model integrated with strain was constructed to describe its hot working behavior. Establishing processing maps, while considering the effect of strain, facilitated the assessment of the workability of the Al–Zn–Mg alloy. Constructed processing maps suggest that recommended processing conditions fall within the range of 475–500 °C and 0.001–0.0001 s−1, revealing the presence of uniform equiaxed grains and recrystallized structures. Samples compressed at 300 °C/0.1 s−1 exhibited adiabatic shear bands and partial recrystallization, while microcracks were found in samples deformed at 400 °C/0.1 s−1 and 500 °C/01 s−1. The microstructural changes were analyzed using EBSD, employing various maps, including IPF, KAM, GOS, and GAM, to assess dislocation density, grain misorientation, and their correlation with recrystallization in relation to both strain rate and temperature.