Slip

—Slip is the prominent mechanism of plastic deformation in metals.

—It involves sliding of blocks of crystal over one other along definite crystallographic planes, called slip planes.

—In physical words it is analogous to a deck of cards when it is pushed from one end.

—Slip occurs when shear stress applied exceeds a critical value.

—During slip each atom usually moves same integral number of atomic distances along the slip plane producing a step, but the orientation of the crystal remains the same.

—Steps observable under microscope as straight lines are called slip lines.