An improved method to model dislocation self-climb

被引:9
|
作者
Liu, Fengxian [1 ]
Cocks, Alan C. F. [2 ]
Gill, Simon P. A. [3 ]
Tarleton, Edmund [1 ,2 ]
机构
[1] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England
[2] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England
[3] Univ Leicester, Sch Engn, Leicester LE1 7RH, Leics, England
基金
英国工程与自然科学研究理事会;
关键词
core diffusion; pipe diffusion; variational principle; self-climb; GRAIN-BOUNDARY DIFFUSION; DOPED SAPPHIRE ALPHA-AL2O3; EDGE DISLOCATION; PIPE DIFFUSION; VARIATIONAL APPROACH; MOLECULAR-DYNAMICS; CONSERVATIVE CLIMB; FIELD MODEL; BREAK-UP; LOOPS;
D O I
10.1088/1361-651X/ab81a8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Dislocations can provide short circuit diffusion paths for atoms resulting in a dislocation climb motion referred to as self-climb. A variational principle is presented for the analysis of problems in which fast dislocation core diffusion is the dominant mechanism for material redistribution. The linear element based self-climb model, developed in our previous work [1] Liu, Cocks and Tarleton (2020 J. Mech. Phys. Solids 135 103783), is significantly accelerated here, by employing a new finite element discretisation method. The speed-up in computation enables us to use the self-climb model as an effective numerical technique to simulate emergent dislocation behaviour involving both self-climb and glide. The formation of prismatic loops from the break-up of different types of edge dislocation dipoles are investigated based on this new method. We demonstrate that edge dipoles sequentially pinch-off prismatic loops, rather than spontaneously breaking-up into a string of loops, to rapidly decrease the total dislocation energy.
引用
收藏
页数:21
相关论文
共 50 条
  • [41] Strain rate effect on dislocation climb mechanism via self-interstitials
    Tang, Xiao-Zhi
    Guo, Ya-Fang
    Sun, Lixin
    Fan, Yue
    Yip, Sidney
    Yildiz, Bilge
    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2018, 713 : 141 - 145
  • [42] The kinetics of static recovery by dislocation climb
    Kohnert, Aaron A.
    Capolungo, Laurent
    NPJ COMPUTATIONAL MATERIALS, 2022, 8 (01)
  • [43] DENDRITIC CLIMB OF PRISMATIC DISLOCATION LOOPS
    JUNQUA, N
    GRILHE, J
    PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1980, 42 (05): : 621 - 627
  • [44] The kinetics of static recovery by dislocation climb
    Aaron A. Kohnert
    Laurent Capolungo
    npj Computational Materials, 8
  • [45] IRRADIATION CREEP ASSOCIATED WITH DISLOCATION CLIMB
    DOLLINS, CC
    TRANSACTIONS OF THE AMERICAN NUCLEAR SOCIETY, 1971, 14 (01): : 155 - &
  • [46] CHANGE OF SHAPE DUE TO DISLOCATION CLIMB
    GROVES, GW
    KELLY, A
    PHILOSOPHICAL MAGAZINE, 1969, 19 (161): : 977 - &
  • [47] REPLY TO DISCUSSION OF DISLOCATION CLIMB FORCES
    LOTHE, J
    HIRTH, JP
    JOURNAL OF APPLIED PHYSICS, 1967, 38 (12) : 4916 - &
  • [48] DISLOCATION CLIMB THEORIES OF CREEP AND SUPERPLASTICITY
    ALDEN, TH
    ACTA METALLURGICA, 1969, 17 (12): : 1435 - &
  • [49] Introducing dislocation climb by bulk diffusion in discrete dislocation dynamics
    Mordehai, Dan
    Clouet, Emmanuel
    Fivel, Marc
    Verdier, Marc
    PHILOSOPHICAL MAGAZINE, 2008, 88 (06) : 899 - 925
  • [50] On the stress exponent of dislocation climb velocity
    Mompiou, F.
    Caillard, D.
    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 483-84 : 143 - 147