Comparison between crystal slip and twinning can be made in aspects like defect type, change in crystal axis, stress requirement, visibility and occurrence threshold value of stress.
S.no |
Slip
|
Twinning
|
---|---|---|
1 | Crystal slip is a line defect. | Twinning is a surface defect grain boundary defect. |
2 | During slip, all atoms in a block move the same distance. | During twinning, the atoms in each successive plane in a block move through different distances proportional to their distance from the twinning plane. |
3 | Slip is commonly observed in Body-centered Cubic (BCC) and Face Centered Cubic (FCC) metals. | Twinning is commonly observed in Hexagonal Close Packing (HCP) metals. |
4 | After the slip, the crystal axis remains the same. | After twinning, the crystal axis is deformed. |
5 | The slipped crystal lattice has the same orientation. | The twinned crystal lattice is the minor image of the original lattice. |
6 | The stress required for slip is comparatively low. | The stress required for twinning is comparatively more. |
7 | The stress necessary to propagate slip is usually higher than the stress required to start slip. | The stress necessary to propagate twinning is lesser than that required starting it. |
8 | Slip can be seen as thin lines when viewed under a microscope. | Twinning can be seen as broad lines when viewed under a microscope. |
9 | A threshold value of stress called critical resolved shear stress is required for slipping to occur. | For twinning to occur, no such threshold value of stress is required. |
All Comments
For twinning to occur, no such threshold valve of stress is required.
I guess you meant “value”
Thanks for the comparison. It was really helpful.
Thanks for point out.