ABSTRACT The viscosity of high Fe-containing hypereutectic Al–Si alloys was studied by using a high-temperature Searle-type rheometer. The results show that the steady-state viscosity of Al–17Si–(2,3,4) Fe alloy melts increases with the increase of iron content. During the continuous cooling of Al–17Si–(2,3,4) Fe alloy melts, the transient viscosity increases slowly at the initial stage of cooling. When the temperature decreases to a critical value, the transient viscosity increases abruptly. In the cooling process of Al–17Si–2Fe–(0,0.4,0.8)Mn alloy melts, the steady-state viscosity continues to increase and reach the maximum value firstly, then decreases abruptly, and then continues to increase again. The steady-state viscosity of Al–17Si–2Fe, Al–17Si–2Fe–0.4Mn and Al–17Si–2Fe–0.8Mn alloy melts experiences a sudden decrease at 630°C, 640°C and 670°C respectively due to the settlement of Fe-rich phases. The maximum value of viscosity of the Al–17Si–2Fe–(0,0.4,0.8)Mn alloy melts is increased with the increase of Mn content.

中文翻译：

---

高铁含量过共晶铝硅合金在液相线温度附近的粘度变化

摘要使用高温 Searle 型流变仪研究了高含 Fe 过共晶 Al-Si 合金的粘度。结果表明，Al-17Si-(2,3,4)Fe合金熔体的稳态粘度随着铁含量的增加而增加。在连续冷却 Al-17Si-(2,3,4) Fe 合金熔体的过程中，瞬态粘度在冷却初期缓慢增加。当温度降低到临界值时，瞬态粘度突然增加。在Al-17Si-2Fe-(0,0.4,0.8)Mn合金熔体冷却过程中，稳态黏度继续增加，先达到最大值，然后突然降低，然后再继续增加。Al-17Si-2Fe、Al-17Si-2Fe-0.4Mn 和 Al-17Si-2Fe-0.8Mn 合金熔体的稳态粘度在 630°C 时突然降低，由于富铁相的沉降，分别为 640°C 和 670°C。Al-17Si-2Fe-(0,0.4,0.8)Mn合金熔体的粘度最大值随着Mn含量的增加而增加。