中文摘要：

溶质元素的 microsegregation 上的一个搏动的磁场(PMF ) 的效果试验性地在基于 Ni 的单个水晶 superalloy 的方向性的团结期间被调查，并且结果证明 PMF 显著地在合金影响艾尔， Ti，公司，瞬间和 W 元素的 microsegregation。然而，分发行为为积极、否定的分离元素不同。与 PMF，否定分离元素的 microsegregation，公司和 W，，有效地被制止积极分离元素，艾尔， Ti 和瞬间，被加重。一个分离模型被建立与 PMF 揭示元素的分发机制。在 PMF 的行动下面，从液体阶段溶质原子跳到稳固的阶段被妨碍，这被考虑，但是从稳固的阶段溶质原子跳进液体阶段在团结期间被支持。作为结果，溶质原子的有效分发系数被减少，它导致否定分离元素的 microsegregation 和积极分离元素的 microsegregation 的恶化的减小。

英文摘要：

The effects of a pulsed magnetic field （PMF） on the microsegregation of solute elements during directional solidification of a Ni-based single crystal superalloy were experimentally investigated, and the results show that the PMF significantly affects the microsegregation of Al, Ti, Co, Mo and W elements in the alloy. However, the distribution behavior differs for both positive and negative segregation elements. With the PMF, the microsegregation of negative segregation elements, Co and W, was restrained effectively, while that of positive segregation elements, A1, Ti and Mo, was aggravated. A segregation model was estab- lished to reveal the distribution mechanism of the elements with PME It is considered that, under the action of PME the jumping of solute atoms from the liquid phase to solid phase is hindered, but the jumping of solute atoms from the solid phase into liquid phase is promoted during solidification. As a result, the effective distribution coefficient of the solute atoms is reduced, which leads to the reduction of microsegregation of negative segregation elements and aggravation of microsegregation of positive segregation elements.