The manner which makes the formation of primary phase of the minute board form decrease which is in the midst of iron content AlSi alloying and the especially AlSiMnFe alloy

摘要

(57) Abstract Because the iron makes the shift brittle iron enriched intermetallic compound phase precipitate while solidifying, it is the harmful impurity at the time of aluminum alloying. The most harmful phase in the microstructure is phase of Al₅ FeSi type. In other words, because this is minute board form. As for this invention, in order the iron content intermetallic compound phase with precipitation of hexagonal phase of Al₈ Fe₂ Si type to start, controlling and production manner of the iron content aluminum alloy which does not have the phase of minute board form by adjust the precipitation status which is in the midst of solidifying is offered. Because phase develops normal minute board configuration, there is no existence of phase of Al₈ Fe₂ Si type and, the nucleus generates with respect to phase of the te and Al₈ Fe₂ Si type, covers the phase of Al₈ Fe₂ Si type, this becomes the configuration whose damage is little. Furthermore, this invention decides the utilization of thermal analysis as means in order to control the configuration of the deposit.