|Title||Plasticity in nanocrystalline and amorphous metals: Similarities at the atomic scale|
|Publication Type||Book Chapter|
|Year of Publication||2004|
|Authors||Lund, AC, Schuh, CA|
|Editor||Busch, R, Hufnagel, TC, Eckert, J, Inoue, A, Johnson, WL, Yavari, AR|
|Book Title||Amorphous and Nanocrystalline Metals|
|Pagination||313 - 318|
For metallic alloys, the amorphous state is often regarded as the limiting structure as grain size is reduced towards zero. One interesting consequence of this limit is that the properties of the finest nanocrystalline metals must begin to resemble those of metallic glasses. In this work we focus upon the nature of the plastic yield mechanisms in these material classes, and seek to identify commonalities and disparities in the nature of plastic yield in glasses and nanocrystals. The discussion is presented with reference to static atomistic simulations of (i) an amorphous binary alloy, and (ii) a nanocrystalline Ni specimen with grain size of 3 rim. We show that both these materials deform by the operation of fine atomic shearing events, and both exhibit asymmetric yielding as a consequence.