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在镍基高温合金的热处理中施加静电场或脉冲电流,研究外场作用下合金组织结构的演化行为及机制。结果表明,静电场处理(EFT)可以促进合金中的空位运动,使合金中孪晶界面比例显著增加;静电场可以促进原子扩散,改变合金中沉淀相形核、长大的热力学及动力学条件。在镍基高温合金的塑性变形过程中进行脉冲电流处理(EPT),可显著降低合金的塑性变形抗力、提高其塑性变形能力。同时,脉冲电流可以降低合金的再结晶激活能,促进再结晶晶核的形成及长大。
In the heat treatment of nickel-base superalloy, an electrostatic field or pulse current is applied to study the evolution behavior and mechanism of the alloy structure under the action of the external field. The results show that electrostatic field treatment (EFT) can promote the vacancy movement in the alloy and increase the ratio of twin interface in the alloy. The electrostatic field can promote the atomic diffusion and change the thermodynamic and kinetic conditions of nucleation and growth of the precipitated phase in the alloy. Pulse current treatment (EPT) during the plastic deformation of Ni-based superalloys can significantly reduce the plastic deformation resistance of the alloy and improve its plastic deformation capacity. At the same time, the pulse current can reduce the recrystallization activation energy of the alloy and promote the formation and growth of recrystallized nuclei.