  The slip transfer phenomenon was studied at the grain boundaries of pure
Aluminum by means of slip trace analysis. Either slip transfer or blocked slip
was analyzed in more than 250 grain boundaries and the likelihood of slip
transfer between two slip systems across the boundary was assessed. The
experimental results indicate that slip transfer was very likely to occur if
the residual Burgers vector, $\Delta$b, was below 0.35b and the Luster- Morris
parameter was higher than 0.9, and that the ratio of the Luster-Morris
parameter and the residual Burgers vector has a threshold above which slip
transfer is probable.
