EFFECT OF COOPERATIVE GRAIN BOUNDARY SLIDING AND NANOGRAIN NUCLEATION ON CRACK GROWTH IN NANOCRYSTALLINE MATERIALS AND METAL-CERAMIC NANOCOMPOSITES

被引：0
|
作者：
Ovid'ko, I. A. [1 ,2 ,3 ]
Sheinerman, A. G. [1 ,2 ,3 ]
机构：
[1] St Petersburg State Polytech Univ, St Petersburg 195251, Russia
[2] Russian Acad Sci, Inst Problems Mech Engn, St Petersburg 199178, Russia
[3] St Petersburg State Univ, Dept Math & Mech, St Petersburg 198504, Russia
来源：
REVIEWS ON ADVANCED MATERIALS SCIENCE | 2014年 / 39卷 / 01期
基金：
俄罗斯科学基金会;
关键词：
FRACTURE-TOUGHNESS; ENHANCED DUCTILITY; BEHAVIOR; NANOMATERIALS; MIGRATION; STRENGTH; ALLOYS; MG;
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 new mechanism of fracture toughness enhancement in nanocrystalline materials and metal-ceramic nanocomposites is suggested. The mechanism represents the cooperative grain boundary sliding and nanograin nucleation (CGBSNN) process near the tips of growing cracks. It is shown that this mechanism can increase the critical stress intensity factor for crack growth in nanocrystalline and nanocomposite materials at least by a factor of 2 to 3 (or even more in some cases), as compared to the case of pure brittle fracture, and thus considerably enhances the fracture toughness of such materials.
引用
收藏
页码：54 / 60
页数：7
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