Crack nucleation at disclinated triple junctions
作者： M. S. Wu , K. Zhou , A. A. Nazarov
DOI: 10.1103/PHYSREVB.76.134105
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摘要: Triple junctions constitute a significant volume fraction of bulk nanocrystalline metals, in which disclinations are typical junction defects. In this study, disclinated tricrystalline nickel nanowire with three [001] tilt grain boundaries intersecting at 120\ifmmode^\circ\else\textdegree\fi{} angles is simulated zero temperature using the embedded atom method. The results show that triple disclination unstable if its strength attains critical value, giving rise to crack. demonstrates size effect. cracking occurs preferentially on boundaries, suggesting some more resistant than others. This also complex crack branching, under an external load may enable material sustain larger deformation before failure. reported findings have important implications development fracture-resistant metals through control boundary structures.
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sci-hub.se 参考文章(31)
G.P. Dimitrakopulos, Ph. Komninou, Th. Karakostas, R.C. Pond, Junction Line Disclinations: Characterisation and Observations Interface Science. ,vol. 7, pp. 217- 229 ,(1999) , 10.1023/A:1008713124286
Alexander H. King, The Geometric and Thermodynamic Properties of Grain Boundary Junctions Interface Science. ,vol. 7, pp. 251- 271 ,(1999) , 10.1023/A:1008769209265
M. Yu. Gutkin, I. A. Ovid’ko, Grain boundary migration as rotational deformation mode in nanocrystalline materials Applied Physics Letters. ,vol. 87, pp. 251916- ,(2005) , 10.1063/1.2147721
M. Yu. Gutkin, I. A. Ovid'ko, Disclinations, amorphization and microcrack generation at grain boundary junctions in polycrystalline solids Philosophical Magazine. ,vol. 70, pp. 561- 575 ,(1994) , 10.1080/01418619408242248
S. M. Foiles, M. I. Baskes, M. S. Daw, Embedded-atom-method functions for the fcc metals Cu, Ag, Au, Ni, Pd, Pt, and their alloys. Physical Review B. ,vol. 33, pp. 7983- 7991 ,(1986) , 10.1103/PHYSREVB.33.7983
A.A. Zisman, V.V. Rybin, Basic configurations of interfacial and junction defects induced in a polycrystal by deformation of grains Acta Materialia. ,vol. 44, pp. 403- 407 ,(1996) , 10.1016/1359-6454(95)00155-8
E. Bouchaud, J.-P. Bouchaud, Fracture surfaces: Apparent roughness, relevant length scales, and fracture toughness. Physical Review B. ,vol. 50, pp. 17752- 17755 ,(1994) , 10.1103/PHYSREVB.50.17752
On the Structure of Tilt Grain Boundaries in Cubic Metals I. Symmetrical Tilt Boundaries Philosophical transactions - Royal Society. Mathematical, physical and engineering sciences. ,vol. 309, pp. 1- 36 ,(1983) , 10.1098/RSTA.1983.0020
R. Divakar, V. S. Raghunathan, Characterisation of interfaces in nanocrystalline palladium Sadhana-academy Proceedings in Engineering Sciences. ,vol. 28, pp. 47- 62 ,(2003) , 10.1007/BF02717125
S.G. Srinivasan, J.W. Cahn, H. Jónsson, G. Kalonji, Excess energy of grain-boundary trijunctions: an atomistic simulation study Acta Materialia. ,vol. 47, pp. 2821- 2829 ,(1999) , 10.1016/S1359-6454(99)00120-2