| dc.description.abstract | This study conducted metal mold gravity casting experiments using three different aluminum alloy compositions: A356 (Al-Si-Mg), A206 (Al-Cu-Mg), and AC2B (Al-Si-Cu). The purpose of the experiment was to explore the formation of oxide films, the degree of porosity defects, and the conditions for hot cracking defects in these three different elemental ratio aluminum alloys during practical casting. Additionally, adjustments to casting parameters, such as mold preheating temperature, were made to address these issues.
The experimental results showed a significant positive correlation between the increase in mold preheating temperature and the generation of porosity defects, especially in the case of A356 alloy. Hot cracking defects were observed only in the A206 alloy, possibly due to its high copper content, which led to rapid cooling and a wide solidification range. After ultrasonic vibration assistance, there were significant differences in the oxide film formation between A356 and AC2B alloys. In the former, oxide films were predominantly concentrated near the vicinity of pores, while in the latter, they were more evenly distributed on the surface.
Keywords:A356、A206、AC2B、gravity casting、oxidation film、porisity rate、hot cracking defect | en_US |