TINJAUAN LITERATUR: PENGARUH TEMPERATUR HOT EXTRUSION PADUAN MAGNESIUM TERHADAP MIKROSTRUKTUR DAN SIFAT MEKANIK

PENGARUH TEMPERATUR HOT EXTRUSION PADUAN MAGNESIUM TERHADAP MIKROSTRUKTUR DAN SIFAT MEKANIK

Abstract

This literature review examines the effect of temperature changes in the hot extrusion process on the microstructure and mechanical properties of various magnesium alloys. The analysis was conducted by reviewing several previous studies that focused on temperature parameters, dynamic recrystallization, crystal texture, grain size, and second phase distribution on the mechanical performance of various magnesium alloys. The literature review method was applied through the stages of identifying relevant sources, evaluating the suitability of the theme, and analyzing the relationship between previous research findings. The results of the study indicate that increasing the extrusion temperature generally accelerates the dynamic recrystallization mechanism and refines the grains, thereby improving the microstructural homogeneity and ductility of the material. However, excessively high temperatures trigger abnormal grain growth and dissolution of the reinforcing phase, which causes a decrease in tensile strength in alloys such as Mg-2Y-1Zn-0.6Zr, Mg-4Zn-1Mn-0.5Ca, and Mg-Zn-Ca. Meanwhile, intermediate temperatures (300–340 °C) have been shown to provide an optimal combination of strength, ductility, and structural stability in most of the alloys reviewed. Overall, this study confirms that temperature control is the most crucial factor in determining the success of the hot extrusion process and the final quality of the magnesium alloy.