When the atoms are out of the original position (dislocated) inside the crystal structure, the phenomena is called Dislocations of Metals. It is likely to be happened when a stress is applied on metals' crystal structure. This is a linear defect. There are mainly two types of Dislocation of Metals.
1. Edge Dislocation
2. Screw Dislocations
Dislocation of Metals is hindered by grain boundaries.
References: https://www.nde-ed.org/EducationResources/CommunityCollege/Materials/Structure/linear_defects.htm
http://resources.schoolscience.co.uk/Corus/16plus/steelch1pg5.html
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