Acta Metall Sin  1997, Vol. 33 Issue (11): 1121-1129    DOI:

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MOLECULAR DYNAMICS STUDY ON THE INFLUENCE OF SINGLE EDGE DISLOCATION ON MARTENSITIC TRANSFORMATIONS IN NiAl

SHA Xianwei;ZHANG Xiumu;LI Bin;LI Yiyi(Institute of Metal Research;The Chinese Academy of Sciences;Shenyang 110015)

SHA Xianwei;ZHANG Xiumu;LI Bin;LI Yiyi(Institute of Metal Research;The Chinese Academy of Sciences;Shenyang 110015). MOLECULAR DYNAMICS STUDY ON THE INFLUENCE OF SINGLE EDGE DISLOCATION ON MARTENSITIC TRANSFORMATIONS IN NiAl. Acta Metall Sin, 1997, 33(11): 1121-1129.

Abstract References Related Articles Recommended Metrics Download:  PDF(998KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Via embedded atom type potential, molecular dynamics simulation has been performed to study the influence of single edge dislocation on both thermally and stress induced martensitic transformations in a stoichiometric NiAl B2 alloy. If no external force is applied to the system, the strain field of single edge dislocation can not nucleate martensites. Edge dislocation can be inherited during the growth processes of thermally induced martensite, and can also migrate toward the surface with the help of the transformation. When a tensile force is applied, stress induced martensite with 3R structure can initially nucleate near the dislocation core. Butterfly martensite appeared first during the growth process, and then another martensitic variant nucleated in the middle of the dislocation.Edge dislocation can reduce the activation energy for stress induced martensitic nucleation, and it also plays a role of plastic accommodation in the transformation processes. Key words:  martensitic transformation      edge dislocation      molecular dynamics simulation      embedded atom type potential      NiAl      Received:  18 November 1997      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1997/V33/I11/1121 1MageeCL.MetallTrans,1971;2:2419 2OlsonGB,CohenM.MetallTrans,1976;7A:1897,1905,1915 3KajiwaraS.MetallTrans,1986;17A:1701 4SuezawaM,CookHE.ActaMetall,1980;28:423 5EasterlingKE,TholenAR.ActaMetall,1976;24:333 6YuZZ,ClappPC.MetallTrans,1989;20A:1617 7沙宪伟,张修睦,陈魁英,李依依.金属学报,1996;32:685 8SchryversD.PhilosMag,1993;A68:1017 9MartynovVY,EnamiK,KhandrosLG,NennoS,TkachenkoAV.PhysMetMetallogr,1983;55:136 10沙宪伟,张修睦,李依依.钢铁研究学报,1997;9(6): 11DawMS,BaskesMI.PhysRev,1984;B29:6443 12RoseJH,SmithJR,GuineaF,FerranteJ.PhvsRev,1984;B29:2963 13ChenSP,SrolovitzDJ,VoterAF.JMaterRes,1989;4:62 14沙宪伟,张修睦,陈魁英,李依依.金属学报,1996;32:1184 15HeermannDW.ComputerSimulationMethodsinTheoreticalPhysics.2nded,Berlin:Springer-Verlag,1990:147 16ClappPC.PhysStatusSolidi,1973;B57:561 17ShaoY.PhD Thesis,UniversityofConnecticut,1993 [1] JIANG Jiang, HAO Shijie, JIANG Daqiang, GUO Fangmin, REN Yang, CUI Lishan. 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