Mechanistic insights into twin fragmentation during plastic deformation of A286 superalloy

YL Jiang and ZG Feng and L Tao and Y Liu, ENGINEERING FAILURE ANALYSIS, 170, 109334 (2025).

DOI: 10.1016/j.engfailanal.2025.109334

Considering the coordination of plastic deformation in the material facilitated by twins, the uniaxial tensile models of A286 superalloy are established. The mechanism of E3111 twin boundary in the plastic deformation of A286 superalloy is investigated by molecular dynamics simulation and experimental techniques. The simulation results indicate that E3111 twins can provide favorable sites for dislocation multiplication, effectively promoting the diffusion of dislocation movement. Conversely, dislocation movement also causes twin boundary migration, ultimately leading to the fragmentation of twin boundaries. Additionally, under equivalent stress conditions, grains in the A286-twin model exhibit better plasticity performance. The presence of twin boundaries effectively prevents issues such as local failure, brittleness, and crack formation caused by non-uniform strain hardening. It can be seen that twin boundaries play a significant role in diversifying and homogenizing the plastic deformation mechanisms of A286 superalloy. Experimental results also indicate that there is a significant reduction of twin boundaries in A286 superalloy after tensile deformation. Simultaneously, the E3111 twin boundaries are distributed in a fragmented manner within high dislocation density regions. It can be seen that the fragmentation of twin boundaries is primarily driven by dislocation movement. The above findings provide theoretical guidance for enhancing A286 superalloy engineering application potential.

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