Chapter 4 Properties of nanomaterials
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Superplas;c Behavior<br />
Superplas;city is the capability <strong>of</strong> some polycrystalline materials to exhibit very<br />
large tensile deforma;ons without necking or fracture. Typically, elonga;ons <strong>of</strong><br />
100% to > 1000% are considered the defining features <strong>of</strong> this phenomenon.<br />
As grain size is decreased it is found that the temperature is lowered at which<br />
superplas;city occurs, and the strain rate for its occurrence is increased. The creep<br />
rates might be enhanced by many orders <strong>of</strong> magnitude and superplas;c behavior<br />
might be observed in nc materials at temperatures much lower than 0.5 TM.
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