I. Deformation features of pol l o Plastic deformation can take place in various ways slip, twinning, g.b. sliding, migration, diffusion ② Multislip+ rotation◆ Ⅱ.Deformation features of polycrystal ◆ Plastic deformation can take place in various ways. slip, twinning, g.b. sliding, migration, diffusion ② Multislip + rotation