摘要: The molecular dynamics method has been used to simulate mode I cracking in Ni3Al. Close attention paid the process of atomic configuration evolution cracks. simulation results show that at low temperature, Shockley partial dislocations are emitted before initiation crack propagation, subsequently forming pseudo-twins on (11 (1) over bar) planes crack-tip zone, and then cleavage occurs. emitting accompanies during process. At higher blunting tip is caused by [110] superdislocations (100) plane. present work also shows dipole 1/2[110] dislocation core can be formed.
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William D Nix, Theory of Dislocations ,(1968)
Ming Dao, Bimal K. Kad, Robert J. Asaro, Mechanism of intense shear failure in Ni3Al single crystals Philosophical Magazine. ,vol. 75, pp. 443- 459 ,(1997) , 10.1080/01418619708205151
Z.W. Shan, X. Wu, L. Liu, J.H. Yang, Y.B. Xu, In situ transmission electron microscopy investigation of crack propagation in single crystal Ni3Al Materials Science and Technology. ,vol. 17, pp. 1398- 1402 ,(2001) , 10.1179/026708301101509368
Y. S. Choi, D. M. Dimiduk, M. D. Uchic, T. A. Parthasarathy, Modelling plasticity of Ni3Al-based L12 intermetallic single crystals. I. Anomalous temperature dependence of the flow behaviour§ Philosophical Magazine. ,vol. 87, pp. 1939- 1965 ,(2007) , 10.1080/14786430601169782
K. J. Hemker, M. J. Mills, Measurements of antiphase boundary and complex stacking fault energies in binary and B-doped Ni3Al using TEM Philosophical Magazine. ,vol. 68, pp. 305- 324 ,(1993) , 10.1080/01418619308221207
JamesE. Angelo, MichaelI. Baskes, Interfacial studies using the EAM and MEAM Interface Science. ,vol. 4, pp. 47- 63 ,(1997) , 10.1007/BF00200838
A.T. Paxton, Y.Q. Sun, The role of planar fault energy in the yield anomaly in L12 intermetallics Philosophical Magazine. ,vol. 78, pp. 85- 103 ,(1998) , 10.1080/014186198253697
H.P. Karnthaler, E.Th. Mühlbacher, C. Rentenberger, The influence of the fault energies on the anomalous mechanical behaviour of Ni3Al alloys Acta Materialia. ,vol. 44, pp. 547- 560 ,(1996) , 10.1016/1359-6454(95)00191-3
P. Veyssiere, J. Douin, P. Beauchamp, On the presence of super lattice intrinsic stacking faults in plastically deformed Ni3Al Philosophical Magazine. ,vol. 51, pp. 469- 483 ,(1985) , 10.1080/01418618508237567
S. Kohlhammer, M. Fähnle, G. Schoeck, The structure of [010] dislocations in Ni3Al Scripta Materialia. ,vol. 39, pp. 359- 363 ,(1998) , 10.1016/S1359-6462(98)00176-6