چكيده به لاتين
Due to the industrial and medical applications, Zink and its alloys have been intensively researched in recent years. However, pure Zinc shows poor mechanical properties, which need improvement to be effectively used. Alloying treatment and hot deformation are usually used to enhance these mechanical properties. Adding Magnesium element can improve the strength of pure Zink; therefore, the Zn-Mg binary alloy is one of the most important Zn alloys which have been studied. Understanding hot deformation behavior during the process is essential. For that reason, in this study, the hot deformation behavior of Zn–1.2Mg alloy was studied using hot compression tests at strain rates of 0.001, 0.01, 0.05, and 0.1 s-1 and deformation temperatures of 400, 450, 500, and 550 K. The results revealed that temperature, strain rate, and strain significantly affect flow stress behavior. The flow stress increases with the increasing strain rate at a given temperature; on the other hand, it reduces with the temperature increase at a specific strain rate. The maximum flow stress can be considered as the start point of dynamic recrystallization, and it shows a wide range of recrystallization on the Zn-1.2Mg during the hot deformation. A consecutive equation with a correlation coefficient of 0.987 was constructed based on the experimental data. The activation energy was calculated at various strains, strain rates, and temperatures. The processing maps on the base of the dynamic materials model (DMM) were established to find the optimum temperature and strain rate for the hot workability behavior of Zn–1.2Mg alloy. Using the processing map, the optimum deformation parameters of Zn–1.2Mg are obtained as a deformation temperature of 500 K and strain rate range of 0.001–0.01 s-1. Temperature and strain rate effects on the microstructure were observed by optical and secondary electron microscope (SEM). In the end, the mechanical properties of deformed samples were studied by microhardness tests.
