Mg-Al-Sn계 합금의 미세 조직과 기계적 특성에 미치는 Al 및 Sn의 영향

Abstract

The Majority of magnesium components aregenerally used in the automotive and electronic industries. However, the application of magnesium alloys is limited to components because of low mechanical properties and corrosion resistance at ambient properties. Especially, Mg-Al system alloys are inexpensive and have standard mechanical properties microstructure and deformation behaviorsat high temperature were investigated. The Mg-Al-Sn based alloys were prepared by casting (Al content :3, 6, 9 wt%, Sn content : 2, 5, 8 wt%) in an electric resistance furnace using steel crucible under the protection of a mixed gas atmosphere of SF6 and CO2. In this work, microstructure of as-cast Mg-Al-Sn alloys consists of α-Mg matrix, β-phase (Mg17Al12) and Mg2Sn eutectic phase. For a given artificialaging treatment, a higher Aluminum and Tin contents produces much precipitates at the grain boundary as well as within the grain in unidirectional solidification. Asa result of this experiment the higher is aluminum contents the higher is the ultimate tensile strength, yield strength, hardness while the lower the elongation.