# Homework Help: Cross slip problem in f.c.c crystal

1. Nov 10, 2008

### rubee

1. The problem statement, all variables and given/known data
Because the book gives me little information about the cross slip. So I can't handle the basic problem below. I appreciate that you can give me some hints or suggestion.
An f.c.c crystal is deforming by motion of disslocations on the (a/2)[101](11-1) (I use minus instead of bar) slip system.
Q1: In order for the dislocations to cross slip, what would be their orientation on the (11-1) plane?
Q2: Onto what plane could these dislocations cross slip?
Q3: What would the orientation of the dislocations on the (a/2)[101](11-1) slip system have to be in order for the dislocations to be in pure edge orientation?
(Sorry about the other simplified symbols instead because of the imput problem)

2. Relevant equations

3. The attempt at a solution
Since dislocations can only slip on planes containing both tangent vector t and Burgers vector b, only dislocations in screw orientation can cross slip.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution