Preparation of 2024/3003 gradient materials by semi-continuous casting using double-stream-pouring technique

摘要

The 2024/3003 aluminum gradient alloys are prepared by semi-continuous casting. The influences of throttle bore diameter of embedded nozzle and temperature of internal melt on composition distribution, mac-rostructure, hardness are analyzed, and the stability of gradient distribution of composition, macrostructure and hardness along the axial direction of the ingot is also studied. The results show that diffe-rent composition profiles can be achieved by adjusting the processing parameters; the volume fraction of inner alloy in the ingot can be increased by enlarging the throttle bore diameter and elevating the temperature of inner me quasi-steady solidification can be realized within 20s during cast processing, and consistent quality ingot is obtained by controlling the casting speed and liquid height of inner melt.