位错&塑性变形 1)Unsheared crystal.Potential slip plane shaded. 2)Shear stress applied.Dislocation has moved in from left.Material to left of dislocation line has sheared by one atomic spacing. 3)Shear stress continues.Dislocation has moved 4)Dislocation line has emerged at right hand further in from left.Amount of sheared material(to side.Whole crystal has sheared on the slip left of dislocation line)has increased plane by one atomic spacing位错 & 塑性变形