Plasticity in nanocrystalline and amorphous metals: Similarities at the atomic scale

TitlePlasticity in nanocrystalline and amorphous metals: Similarities at the atomic scale
Publication TypeBook Chapter
Year of Publication2004
AuthorsLund, AC, Schuh, CA
EditorBusch, R, Hufnagel, TC, Eckert, J, Inoue, A, Johnson, WL, Yavari, AR
Book TitleAmorphous and Nanocrystalline Metals
Volume806
Pagination313 - 318
Abstract

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.