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August 14th, 2006
Window into the Deformation of Nanoscale Materials
Abstract:
Materials on the nanoscale don't always have the same properties they would in bulk; for one thing, nanomaterials are often a lot harder. Unlike most bulk materials, a crystal that is small enough can be perfect, free of defects, capable of achieving strength near its ideal theoretical limit. Scientists have long assumed that a crystal needs to be perfect to sustain stress at its theoretical limit. Beyond this point dislocations in the crystal lattice occur, and the crystal undergoes a nonreversible change of shape, or plastic deformation.
Now a team from the Department of Energy's Lawrence Berkeley National Laboratory, Purdue University, and Hysitron Incorporated in Minneapolis has found that things don't necessarily happen this way.
Source:
Lawrence Berkeley National Laboratory
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