GRAIN BOUNDARY ROTATIONS NEAR CRACK TIPS IN DEFORMED NANOMATERIALS

被引：0
作者：
Ovid'ko, I. A. [1 ,2 ,3 ]
Sheinerman, A. G. [1 ,2 ,3 ]
机构：
[1] St Petersburg State Univ, Dept Math & Mech, St Petersburg 198504, Russia
[2] Russian Acad Sci, Inst Problems Mech Engn, St Petersburg 199178, Russia
[3] St Petersburg State Polytech Univ, St Petersburg 195251, Russia
来源：
REVIEWS ON ADVANCED MATERIALS SCIENCE | 2014年 / 37卷 / 1-2期
关键词：
THIN-FILMS; NANOCRYSTALLINE; DEFORMATION; DUCTILITY; STRENGTH; METALS; AL; NANOINDENTATION; BEHAVIOR; ALLOYS;
D O I：
暂无
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A special mechanism/mode of plastic deformation occurring through stress-driven rotations of low-angle grain boundaries (GBs) near crack tips in nanocrystalline and ultrafine-grained (UFG) materials is theoretically described. It is demonstrated that such rotations of GBs represent energetically favorable processes in wide ranges of parameters characterizing pre-cracked specimens with nanocrystalline and UFG structures. Also, these rotations of GBs in part release high stresses concentrated near crack tips and thus hamper crack growth.
引用
收藏
页码：97 / 104
页数：8
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