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1·To prevent from heat crack, the choose of aluminum alloy with small crystal temperature range and the use of metal cast model, as well as adoption of gradual solidification style will be effective.

选择有效结晶温度范围小的铝合金、采用金属型铸型以及逐层凝固的冷却方式可以有效消除裂纹。

2·The results show that: manganese lowers liquidus and eutectic temperature, and narrows down the temperature range of solidification;

结果表明：锰降低液相线温度和共晶温度，缩小凝固温度范围；

3·Within a suitable range of temperature gradient, channel segregation is easy to develop when solidification rate is slow.

对适当范围的温度梯度，凝固速度较小时通道偏析易于形成。