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通过分子动力学模拟(MD),研究在HCP镁中的一个对称倾斜晶界与基面滑移的位错相互作用而激发的变形孪晶,也就是孪晶形核与长大的过程(或者是孪晶界迁移,TBM)。{1 121}孪晶在该过程中是最易被激发的孪生模式。一旦这样的孪晶形成了,它们就会不断长大。该种孪晶界迁移是由单纯的原子位置局域调整造成的。在模拟过程中同时也产生了二次孪晶{1 122}。该二次孪晶模型的孪晶形核与长大需要克服的能垒与{1 121}孪晶不同。同时,二次孪晶的孪晶界迁移过程是通过孪晶界上的锥形滑移而激发的。
Through molecular dynamics simulations (MD), we study the deformation twin induced by the interaction between a symmetric oblique grain boundary in HCP magnesium and the dislocation of basal slip, that is, the process of nucleation and growth (or Twinning, TBM). {1 121} Twins are the most easily stimulated twins in the process. Once such twins have formed, they will grow. This kind of twin boundary migration is caused by the simple local adjustment of atomic positions. In the simulation process also produced a second twins {1 122}. The twins of the twin model nucleation and growth need to overcome the energy barrier and {121} twin different. At the same time, the twin twinning process is triggered by the conical slip on the twin boundaries.