摘要: When exposed for the first time to materials engineering, students often ask: “Why study dislocations? Why can’t we get an engineering diploma without making this effort?” Such questions did not cross minds of Taylor, Orowan and Polanyi, fathers modern dislocation theory in 1934, when they independently suggested their novel dislocations, following concepts developed by Volterra 1905. Their basic insights were crucial development science structure, understanding structural properties and, particular, essential concept deformation materials. A dislocation, due its extent, is considered be a line defect one various types defects found which determine each every property crystal. Briefly, are perfect contain variety defects. These defects, that material, are:
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