The crack nucleation in hierarchically nanotwinned metals

被引：9
|
作者：
Zhang, Feng [1 ,3 ]
Liu, Yaqian [1 ,3 ]
Zhou, Jianqiu [1 ,2 ,3 ]
机构：
[1] Nanjing Tech Univ, Dept Mech Engn, Nanjing 210009, Jiangsu, Peoples R China
[2] Wuhan Inst Technol, Dept Mech Engn, Wuhan 430070, Hubei, Peoples R China
[3] Key Lab Design & Manufacture Extreme Pressure Equ, Nanjing, Jiangsu, Peoples R China
来源：
ENGINEERING FRACTURE MECHANICS | 2018年 / 201卷
基金：
中国国家自然科学基金;
关键词：
Nanocrystalline metals; Hierarchical twin lamellae; Dislocations; Crack nucleation; DISLOCATION PILE-UPS; MECHANICAL-PROPERTIES; TWIN BOUNDARIES; CU; DEFORMATION; STRENGTH; COPPER;
D O I：
10.1016/j.engfracmech.2018.08.027
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The nanocrystalline (NC) metals with hierarchical twin lamellae exhibit excellent mechanical properties. However, recent efforts are mainly focused on the effects of primary twin boundaries (TB) and grain boundaries (GB) on crack nucleation. Few investigations have been performed on secondary twin boundary (STB) effect on crack nucleation in hierarchically nanotwinned metal. A relevant model is established to describe the crack nucleation criteria quantitatively. Actually, the crack advance mainly depends on the energy of crack nucleation and the energy of pile-up dislocations. Furthermore, predictions about the site of crack nucleation are made for different hierarchically nanotwinned metals. This work will help us better understand the deformation mechanism and the failure behavior in NC materials with hierarchically nanostructures.
引用
收藏
页码：29 / 35
页数：7
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