Schmidt factor and slipping systems

Chemist20

correct me if I'm wrong please:


Initial slip system is [011] (-1-11)
If I have a tensile axis orientated in [-214], as slipping proceeds it will rotate towards the following direction:

[-214] + n[011] = [-225] it will rotate towards the [-225] direction.

once it gets there, there will now be two slip systems available. [-101](111) and [011](-1-11).

now.. my question is... my book it says that the [-225] will rotate towards the <112> type direction but will never quite get there. for deformation along the <112> type direction the rotations induced by the two slip systems exactly cancel


my question is: WHYYYYYYY???????????????????