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借助Willis-Steeds-Lothe方法计算了单根长直刃型与螺型位错应力场,并采用相场动力学方法模拟了含位错Ti-6Al-4V合金中b→a转变过程,探索长直位错应力场下共格a相的形核及对微织构形成的影响.研究表明,刃型位错应力场与择优a变体间相互作用能中,正应力分量S33起主要作用;螺型位错时切应力分量S23作用最大.刃型位错应力场对a变体选择的作用要强于螺型位错.刃型位错下择优变体以V1与V7为主,螺型位错时以变体V7,V10及V12为主,且V1/V7,V1/V4/V6是刃型位错下主要出现的变体组合类型,而螺型位错时则以V7/V10/V12组合为主.含位错体系的微观组织由位错应力场与a变体之间相互作用能,以及a变体之间弹性相互作用能共同决定.位错周围的应力场可导致界面能较高的界面类型出现.
The single long linear blade and screw dislocation stress field were calculated by the method of Willis-Steeds-Lothe, and the b → a transition in the dislocated Ti-6Al-4V alloy was simulated by phase-field dynamics, The results show that the positive stress component S33 plays a major role in the interaction energy between the edge dislocation stress field and the preferred a variant. The shear stress component S23 has the greatest effect on screw dislocation.The effect of edge dislocation stress field on the selection of a variation is stronger than that of screw dislocation.While the edge variation of edge dislocation is dominated by V1 and V7, V7, V10 and V12 are the main types, and V1 / V7 and V1 / V4 / V6 are the main combinations of the variant types under blade edge dislocations, while the screw dislocations are based on the combination of V7 / V10 / V12 The microstructure of the dislocation-containing system is determined by the interaction energy of the dislocation stress field with the a-type and the elastic interaction between the a-type dislocations.The stress field around the dislocation can lead to the interface with higher interface Type appears.