由于合金中组元比重的不同所引起的偏析，叫比重偏析。
同时给出能减轻比重偏析的最优动态浇注工艺参数组合。
Also provided a group of dynamic pouring process parameters, by which we can greatly abate the specific gravity segregation.
计算结果与试验结果基本吻合，表明该凝固模型能较好地模拟比重偏析现象。
The calculating result showed that it fit for the experiment result, and would simulate weightiness proportion segregation phenomena truly.
挤压铸造使棒状ZA27合金铸件的比重偏析有所改善，铸件成分分布更加均匀。挤压铸造可以明显改善棒状ZA27合金铸件的显微偏析。
Squeeze casting can not only improve the gravity segregation and distribution of the chemical constitution of the cast but also the microsegregation of bar-shaped ZA27 alloy.
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