Twinnability Predication for fcc Metals

B.Q.Li1),M.L.Sui2) and S.X.Mao3) 1) Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China 2) Institute of Microstructure and Properties of Advanced Materials,Beijing University of Technology,Beijing 100124,China 3) Department of Mechanical Engineering and Materials Science,University of Pittsburgh,Pittsburgh,Pennsylvania 15261,USA

摘 要：Inherent twinnability of face-centered-cubic（fcc） metals was analyzed based on the direct competition between twinning partial dislocation nucleation and trailing partial dislocation nucleation,with which the twinnability of fcc metals can be simply expressed as function of the stacking-fault energy,the unstable stacking-fault energy,and the unstable twinningfault energy of fcc metals.The predicted twinnability ranking matched well with former experimental results and provided a physical insight to understand twinnability from crystallographic orientation and fault energy parameters.

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