铸造锌铝系合金底缩现象探讨

Discussion on Bottom-Shrinkage in Cast Zn-Al Alloy

锌铝系合金铸造时出现反常的底部缩孔,而用一般上置式冒口对此类缩孔的补缩效果甚微。由于重力偏析造成的异常成分过冷导致底缩现象,因此针对成因提出消除或减轻底缩的途径。

There is abnormal bottom shrinkage in Zn Al alloy castings and top riser has little effect on them. The reason causing bottom shrinkage is that gravitational segregation results in unusual composition undercooling, the method to eliminate or ease bottom shrinkage is given.