Coble creep in heterogeneous materials: The role of grain boundary engineering

被引:14
|
作者
Chen, Ying [1 ]
Schuh, Christopher A. [1 ]
机构
[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
来源
PHYSICAL REVIEW B | 2007年 / 76卷 / 06期
关键词
D O I
10.1103/PhysRevB.76.064111
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Grain boundary engineering methods improve materials properties by modifying the composition and connectivity of grain boundary networks. A quantitative understanding of grain boundary network characteristics and their impact on materials properties is therefore desirable for both scientific and practical purposes. In this paper, we focus on the case of Coble creep, a viscous deformation mechanism prevailing at intermediate to high temperatures. Using computer simulations, we characterize the creep viscosity as a function of the fraction of slow-diffusing "special" grain boundaries in a two-dimensional honeycomb grain boundary network. This basically defines a new class of percolation problem where mass diffusion and force equilibrium are coupled in a complex way. The percolation threshold and scaling exponents are extracted from the simulation data and analyzed in the context of correlations and energy balance on the network. We also explore stress concentrations induced by the grain boundary character distribution, the effect of crystallographic constraints, and an empirical effective-medium equation that may be used with classical creep constitutive laws in order to predict the viscosity of a heterogeneous material.
引用
收藏
页数:13
相关论文
共 50 条
  • [21] On the role of iterative processing in grain boundary engineering
    Owen, Gregory
    Randle, Valerie
    SCRIPTA MATERIALIA, 2006, 55 (10) : 959 - 962
  • [22] Grain boundary engineering and the role of the interfacial plane
    Davies, P
    Randle, V
    MATERIALS SCIENCE AND TECHNOLOGY, 2001, 17 (06) : 615 - 626
  • [23] The Role of Σ9 Boundaries in Grain Boundary Engineering
    V. Randle
    M. Coleman
    M. Waterton
    Metallurgical and Materials Transactions A, 2011, 42 : 582 - 586
  • [24] A new approach to grain boundary engineering for nanocrystalline materials
    Kobayashi S.
    Tsurekawa S.
    Watanabe T.
    Watanabe, Tadao (tywata@fk9.so-net.ne.jp), 1829, Beilstein-Institut Zur Forderung der Chemischen Wissenschaften (07): : 1829 - 1849
  • [25] Grain boundary engineering for structure materials of nuclear reactors
    Tan, L.
    Allen, T. R.
    Busby, J. T.
    JOURNAL OF NUCLEAR MATERIALS, 2013, 441 (1-3) : 661 - 666
  • [26] A new approach to grain boundary engineering for nanocrystalline materials
    Kobayashi, Shigeaki
    Tsurekawa, Sadahiro
    Watanabe, Tadao
    BEILSTEIN JOURNAL OF NANOTECHNOLOGY, 2016, 7 : 1829 - 1849
  • [27] Analytical solution for Coble creep in polycrystalline materials under biaxial loading
    Li, Yinfeng
    Li, Shu
    Huang, Mingxin
    Li, Zhonghua
    MECHANICS OF MATERIALS, 2015, 91 : 290 - 294
  • [28] Grain boundary sliding during creep: Role of boundary misorientation and strain compatibility
    Sheikh-Ali, A
    Szpunar, J
    Garmestani, H
    CREEP DEFORMATION: FUNDAMENTALS AND APPLICATIONS, 2002, : 127 - 136
  • [29] ROLE OF GRAIN-BOUNDARY MIGRATION DURING CREEP OF ZINC
    SINGH, V
    RAO, PR
    TAPLIN, DMR
    JOURNAL OF MATERIALS SCIENCE, 1973, 8 (03) : 373 - 381
  • [30] THE ROLE OF INHOMOGENEOUS CAVITATION ON GRAIN-BOUNDARY CREEP FRACTURE
    WILKINSON, DS
    JOURNAL OF METALS, 1988, 40 (07): : A35 - A35