What is the difference between slip and twinning

Learn how your comment data is processed. Engineering Materials Share on Facebook. New Posts. Liquid Fuels. Related Posts. Fracture of Material causes Failure to the Specimen. Deformation Types of Solid Materials. Introduction to Atomic Structure. Next Article Capillarity. This term is used in the field of material science. A slip can occur by the passage of dislocations on close-packed planes. These are the planes containing the greatest number of atoms per area and in close-packed directions.

Generally, we call the close-packed planes as slip or glide planes. Typically, an external force that is applied to a crystal lattice can cause the parts of the crystal lattice to glide along with each other, which can change the geometry of that material.

We need a critical resolved shear stress in order to initiate a slip. We can identify different slip systems, including the face-centred cubic system where the slip occurs along the close-packed plane, body centred cubic crystals where slip occurs along the plane of shortest Burgers Vector, hexagonal close-packed systems where the slip occurs along the densely packed plane, etc.

Crystal twinning is the event where two different crystals share some of the same crystal lattices that are pointing in a symmetric manner. This term is mainly used in the field of material science. Deformation twinning can be an elastic or plastic deformation where the orientation of molecules in the crystal is changed systematically due to shear stress.

Pressure twinning of calcite can be seen when slicing the crystal with a sharp blade across the edge of the cleavage plane. Twinning is a prominent mechanism of plastic deformation in some metallic materials. It is a shear force that can produce atomic displacements. Twinning may be produced by mechanical deformation or as the result of annealing following plastic deformation. Twinning is also known as mechanical twinning. 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. Slip occurs when shear stress applied exceeds a critical value. Twinning is when two people appear to be twins because they say or do the same thing. It commonly occurs when people wear the same outfit without planning or respond to a question in the same way.