Nucleation and Crystal Growth in Sheared Granular Sphere Packings

被引：69

作者：

Panaitescu, Andreea ^{[1
]}

Reddy, K. Anki ^{[1
]}

Kudrolli, Arshad ^{[1
]}

机构：

[1] Clark Univ, Dept Phys, Worcester, MA 01610 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 10期

基金：

美国国家科学基金会;

关键词：

RANDOM CLOSE PACKING; HARD; ORDER; CRYSTALLIZATION; ENTROPY; SYSTEMS;

D O I：

10.1103/PhysRevLett.108.108001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the nucleation of ordered phases, their symmetries, and distributions in dense frictional hard sphere packings as a function of particle volume fraction phi, by imposing cyclic shear and constant applied pressure conditions. We show, with internal imaging, that the nucleating crystallites in the bulk consist of 10-60 spheres with hexagonal close packed (hcp) order and nonspherical shape, that are oriented preferentially along the shear axis. Above phi = 0.62 +/- 0.005, crystallites with face centered cubic (fcc) order are observed with increasing probability, and ordered domains grow rapidly. A polycrystalline phase with domains of fcc and hcp order is observed after hundreds of thousands of shear cycles.

引用

页数：5

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