why does dislocation slip take place on closed packed crystallographic planes and along close packed crystallographic directions? why dislocation motion (slip) is not possible at room temperature in ionic solids such as nacl?

Respuesta :

The bonds between the atoms in these planes are stronger than the bonds between atoms in one plane and atoms in another plane.

Slip systems are essential for metal deformation. Crystal lattices slide past one another and form slip systems when shear force is applied along an object's length. The slip systems are specific to the lattice in which they exist. The planes with the maximum atom density are called slip planes. Small repeat intervals between atoms are consequently necessary for simple dislocation movement (in other words high atomic density). Since there are more atoms packed inside of enclosed pack planes than in other planes, this criterion is best satisfied by them.

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