Slip is defined as a shear deformation that moves atoms by many inter atomic distances in one crystal plane over the atoms of another crystal plane. Because of plastic deformation, the crystals is divided into layers or slip blocks which are displaced in reference to each other and are separated by thin layers in which a considerable displacement of atoms has taken place. These intermediate layers with strongly distorted lattices are called "slip planes" slip occurs more readily along certain crystal directions and plane than along others.
Where a single crystal HCP metal was deformed plastically.
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