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Analysis for twinning and slip in face-centered cubic crystals under axisymmetric co-deformation

science china(Technological sciences) 2006年第5期49卷 521-536页

作者： chen zhiyong1.2. cai hongnian1. zhang xinming2. wang fuchi1.& tan chengwen1.3.1. school of material science and engineering, beijing institute of technology, beijing 1.0081. china 2. school of material science and engineering, Central South University, Changsha 410083, china 3. school of material science and engineering, beijing University of Aeronautics and Astronautics, beijing 100083, china school of material science and engineering Beijing Institute of Technology Beijing China school of material science and engineering Central South University Changsha China school of material science and engineering Beijing University of Aeronautics and Astronautics Beijing China

The maximum work principle of Bishop-Hill was developed to analyze the axisymmetric co-deformation in face-centered cubic crystals (f.c.c.) for twinning on {111} 1.2 and slip on {111} 110 systems. The influence of ξ , the ratio of critical re- solved shear stress for twinning to slip, on the yield stress states and corresponding active slip or/and twinning systems for orientations in the standard stereographic triangle of cubic crystal was investigated systematically. The Taylor factors and the anisotropy of yield strength for three important orientations [100], [110] and [111] in orientation space were analyzed. It is found that the yield strength asymmetry for the case of axisymmetric de- formation of tension and compression can be explained based on the microscopic theory of crystal plasticity. The concept of orientation factor for twinning ability was proposed and the deformation mechanism map in the orientation space was established for the case of axisymmetric deformation. The deformation texture formation and development of f.c.c. crystals with low stacking fault energy for axisymmetric tension can be explained qualita- tively on the basis of analyzed results.

关键词： twinning slip face-centered cubic crystals axisymmetric co-deformation Bishop-Hill maximum work principle yield strength anisotropy

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