NANOCRACK GENERATION DUE TO STRESS-DRIVEN WIDENING OF TWINS IN NANOTWINNED METALS

被引：0
|
作者：
Ovid'ko, I. A. [1 ,2 ]
Sheinerman, A. G. [1 ,2 ]
机构：
[1] St Petersburg State Polytech Univ, St Petersburg 195251, Russia
[2] St Petersburg State Univ, Dept Math & Mech, St Petersburg 198504, Russia
来源：
REVIEWS ON ADVANCED MATERIALS SCIENCE | 2014年 / 39卷 / 01期
关键词：
CENTERED-CUBIC METALS; ULTRAHIGH HARDNESS; BOUNDARIES; MECHANISMS; NANOSCALE; TELLURIDE; STRENGTH; COPPER; CU;
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 theoretical model is suggested which describes generation of nanocracks in nanotwinned metals during their plastic deformation occurring through stress-driven widening of nanoscale twins in nanotwinned metals. In the framework of the suggested model, widening of pre-existent growth twins under mechanical load carries plastic deformation and leads to formation of wedge disclination structures at junctions of twin and grain boundaries. These disclinations create high local stresses capable of inducing nanocrack generation. The conditions for such a crack generation in nanotwinned metals are calculated.
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收藏
页码：9 / 14
页数：6
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