Some of twin can be separated into fine grain with large angular grain boundary under large shear stress, and martensitic transformation occurs.

• 部分孪晶在剪切力作用下，剪切带可直接碎化成具有大角度位向差的细小晶粒(奥氏体亚晶+马氏体晶粒)，可发生马氏体相变；