Effect of cooperative grain boundary sliding and migration on emission of dislocations from a crack tip in nanocrystalline materials

被引：30
作者：
Feng, H. [1 ]
Fang, Q. H. [1 ,2 ]
Zhang, L. C. [2 ]
Liu, Y. W. [1 ]
机构：
[1] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China
[2] Univ New S Wales, Sch Mech & Mfg Engn, Sydney, NSW 2052, Australia
来源：
MECHANICS OF MATERIALS | 2013年 / 61卷
关键词：
Nanocrystalline materials; Crack; Grain boundary sliding; Grain boundary migration; Dislocation emission; WEDGE DISCLINATION DIPOLE; EDGE DISLOCATION; FRACTURE-TOUGHNESS; ULTRAHIGH STRENGTH; BRITTLE BEHAVIOR; DEFORMATION; NANOMATERIALS; DUCTILITY; STRESSES; GROWTH;
D O I：
10.1016/j.mechmat.2013.02.006
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Interaction of the cooperative grain boundary sliding and migration with a crack in deformed nanocrystalline materials is investigated using the complex variable method. Effects of the two disclination dipoles produced by the cooperative deformation on the emission of lattice dislocations from the crack tip are theoretically described. The complex form expressions of the stress field and the force field are derived. The critical stress intensity factors for the first dislocation emission are calculated. Influences of disclination strength, grain size, locations of the two disclination dipoles as well as crack length on the critical stress intensity factors are discussed in detail. Results show that, the cooperative deformation has great influence on dislocation emission from the crack tip. In general, the cooperative deformation can promote the lattice dislocation emission from the crack tip, thus improve the toughness of the nanocrystalline materials. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：39 / 48
页数：10
相关论文
共 50 条
  • [41] Effect of nanograin boundary sliding on nanovoid growth by dislocation shear loop emission in nanocrystalline materials
    Zhao, Yingxin
    Fang, Qihong
    Liu, Youwen
    [J]. EUROPEAN JOURNAL OF MECHANICS A-SOLIDS, 2015, 49 : 419 - 429
  • [42] KINETICS OF GRAIN BOUNDARY SLIDING AND ROTATIONAL DEFORMATION IN NANOCRYSTALLINE MATERIALS
    Ovid'ko, I. A.
    Sheinerman, A. G.
    [J]. REVIEWS ON ADVANCED MATERIALS SCIENCE, 2013, 35 (1-2) : 48 - 58
  • [43] Effect of cooperative grain boundary sliding and migration on fracture toughness of nanostructured solids with inclusions
    [J]. Bobylev, S.V. (bobylev.s@gmail.com), 1600, Institute for Problems in Mechanical Engineering, Russian Academy of Sciences (52): : 1 - 2
  • [44] Dislocations in Grain Boundary Regions: The Origin of Heterogeneous Microstrains in Nanocrystalline Materials
    Zhang, Zhenbo
    Odor, Eva
    Farkas, Diana
    Joni, Bertalan
    Ribarik, Gabor
    Tichy, Geza
    Nandam, Sree-Harsha
    Ivanisenko, Julia
    Preuss, Michael
    Ungar, Tamas
    [J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2020, 51 (01): : 513 - 530
  • [45] Emission of dislocations from grain boundaries by grain boundary dissociation
    Hoagland, Richard G.
    Valone, Steven M.
    [J]. PHILOSOPHICAL MAGAZINE, 2015, 95 (02) : 112 - 131
  • [46] Tungsten content and grain boundary misorientation angle effect on crack blunting in nanocrystalline Ni-W alloy
    Zhao, Yanjie
    Zhou, Jianqiu
    [J]. JOURNAL OF NANOPARTICLE RESEARCH, 2017, 19 (12)
  • [47] Enhancing dislocation emission in nanocrystalline materials through shear-coupled migration of grain boundaries
    Li, Jianjun
    Soh, A. K.
    Wu, Xiaolei
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2014, 601 : 153 - 158
  • [48] A synergetic grain growth mechanism uniting nanograin rotation and grain boundary migration in nanocrystalline materials
    Li, Jianjun
    Qin, Feng
    Lu, Wenjun
    Weng, George J.
    [J]. RESULTS IN PHYSICS, 2019, 14
  • [49] Superplasticity and cooperative grain boundary sliding in nanocrystalline Ni3Al
    Mara, N. A.
    Sergueeva, A. V.
    Mara, T. D.
    McFadden, S. X.
    Mukherjee, A. K.
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2007, 463 (1-2): : 238 - 244
  • [50] Effect of thermal activation energy on dislocation emission from an elliptically blunted crack tip
    Zeng, Xin
    Fang, Qi-Hong
    Liu, You-Wen
    [J]. PHYSICA B-CONDENSED MATTER, 2014, 447 : 15 - 18
12345