What is grain boundary ,tilt boundary ,twin boundary?
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Grain boundary: A grain boundary is the interface between two grains, or crystallites, in a polycrystalline material.
Tilt boundary: A pure tilt boundary causes a constant angle of tilt between lattice planes of the same type in adjacent regions of the sample. It is composed of a regular array of edge dislocations of the same sign in the plane of the boundary.
Twin boundary: A twin boundary or composition surface separates the two crystals. Crystallographers classify twinned crystals by a number of twin laws. These twin laws are specific to the crystal system. The type of twinning can be a diagnostic tool in mineral identification.
Tilt boundary: A pure tilt boundary causes a constant angle of tilt between lattice planes of the same type in adjacent regions of the sample. It is composed of a regular array of edge dislocations of the same sign in the plane of the boundary.
Twin boundary: A twin boundary or composition surface separates the two crystals. Crystallographers classify twinned crystals by a number of twin laws. These twin laws are specific to the crystal system. The type of twinning can be a diagnostic tool in mineral identification.
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