结果显示，杂质元素的含量偏高和沿晶界的偏析以及不均匀的钨晶粒是造成国产钨靶表面损伤的主要原因。

The results show that high content of impurity elements, segregation along grain boundaries and uneven grain size are main reasons for the surface damage of domestic tungsten targets.

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感生磁场具有电磁净化的作用，可以有效地消除杂质颗粒以及偏析、负偏析和气孔形成的机率。

The induced electromagnetic field possesses the action of electromagnetic purification, and effectively removes formation of impurity grain, segregation, negative segregation and gas cavity.

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杂质常常在晶粒间界偏析。

Impurities tend to segregate at grain boundaries.

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