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Volumn 89, Issue 16, 2002, Pages 165501/1-165501/4

Dislocation jamming and Andrade creep

Author keywords

[No Author keywords available]

Indexed keywords

ADAPTIVE ALGORITHMS; BOUNDARY CONDITIONS; COMPUTER SIMULATION; CREEP; CRYSTAL STRUCTURE; PHASE TRANSITIONS; PLASTIC DEFORMATION; RELAXATION PROCESSES; RUNGE KUTTA METHODS; SHEAR STRESS; STRAIN; VECTORS;

EID: 0037078712     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevLett.89.165501     Document Type: Article
Times cited : (164)

References (30)
  • 11
    • 0026104521 scopus 로고
    • note
    • The power-law creep relaxation comes out by introducing a phenomenological hardening law and assuming that the strain produced by a thermal activation event is proportional to the activation volume - which may not be true for dislocations moving through a field of discrete obstacles as studied in J. G. Sevillano, E. Bouchaud, and L. P. Kubin, Scr. Metall. Mater. 25, 355 (1991)
    • (1991) Scr. Metall. Mater. , vol.25 , pp. 355
    • Sevillano, J.G.1    Bouchaud, E.2    Kubin, L.P.3
  • 17
    • 0000721982 scopus 로고
    • edited by F. R. N. Nabarro (North-Holland, Amsterdam)
    • H. Neuhäuser, in Dislocations in Solids, edited by F. R. N. Nabarro (North-Holland, Amsterdam, 1983), p. 319.
    • (1983) Dislocations in Solids , pp. 319
    • Neuhäuser, H.1
  • 26
    • 0001666093 scopus 로고
    • note
    • d ∞ exp(- ΔG/kT) that depends exponentially on temperature (ΔG is the barrier height); see, e.g., U. F. Kocks, A. S. Argon, and M. S. Ashby, Prog. Mater. Sci. 19, 1 (1975). This temperature dependence may strongly affect the rate of creep relaxation, but does not change the nature of the T = 0 nonequilibrium critical point underlying the power law.
    • (1975) Prog. Mater. Sci. , vol.19 , pp. 1
    • Kocks, U.F.1    Argon, A.S.2    Ashby, M.S.3
  • 28
    • 84988740198 scopus 로고    scopus 로고
    • note
    • Dislocation annihilation is significant during the initial relaxation at zero stress. Since this eliminates most close pairs, only little annihilation takes place during the subsequent creep simulation: The fraction of dislocations which annihilate after the stress is applied is typically about 2%-5% of the initial density only. Therefore our results, which have been obtained for a high dislocation density, can be scaled down to lower densities where dislocation annihilation is unimportant.
  • 29
    • 84988774078 scopus 로고    scopus 로고
    • note
    • We consider a model of rigid dislocations threading the whole sample. Thus, the thermal effects we have included may be relevant only in very thin samples, thicker specimens being captured by zero temperature results.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.