A linear crystalline defect associated with the lattice distortion created when normally parallel planes are joined together to form a helical ramp.The Burgers vector is parallel to the dislocation line.

• 一种一维线型晶体缺陷,形态上可是描述为当相互平行的相邻晶面之间依次错粘合在一起形成的螺旋型斜面的中心线区域所形成的原子错排组态,螺型位错的柏氏矢量平行与其位错线。