Atomistic simulation of microtwinning at the crack tip in L12Ni3Al

作者: Hong-Xian Xie , Liu Bo , Tao Yu

DOI: 10.1080/14786435.2011.652690

关键词:

摘要: The mechanisms of deformation at the crack tip in L12 Ni3Al have been studied by molecular dynamics simulations. stress-induced microtwinning is found to occur when a sufficiently high stress concentration exists. formation mechanism discussed. It be achieved emission Shockley partial dislocations from and then slip on adjacent {111} planes. Furthermore, also discussed standpoint stress.

参考文章(31)
Simon Higgins, William Eccleston, Mater. Res. Soc. Symp. Proc. MRS. ,(2006)
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
C. S. Becquart, P. C. Clapp, J. A. Rifkin, Molecular-dynamics simulation of tweed structure and the omega phase in Ni-Al. Physical Review B. ,vol. 48, pp. 6- 13 ,(1993) , 10.1103/PHYSREVB.48.6
Xie Hong-Xian, Wang Chong-Yu, Yu Tao, Du Jun-Ping, Dislocation formation and twinning from the crack tip in Ni 3 Al: molecular dynamics simulations Chinese Physics B. ,vol. 18, pp. 251- 258 ,(2009) , 10.1088/1674-1056/18/1/041
N. I. Medvedeva, Yu. N. Gornostyrev, A. J. Freeman, Electronic origin of solid solution softening in bcc molybdenum alloys. Physical Review Letters. ,vol. 94, pp. 136402- ,(2005) , 10.1103/PHYSREVLETT.94.136402
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