The results show that the direction of crack propagation is parallel to the surface.
扫描照片显示裂纹扩展方向平行于表面。
This is formed by the cracks oscillating about the centerline in the direction of crack propagation.
这是由于在裂纹的传播过程中，裂纹尖端沿着传播方向的中线上下振荡所形成的。
The results showed that the weak interface can block the motion of the dislocations and change the propagation direction of the main crack, and result in forming lamella fracture surface.
结果表明，弱界面有阻碍位错运动、偏转主裂纹扩展方向的作用，可形成分层断口。
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