In these cases, twins have a remarkable effect on the mechanical properties of face-centered cubic (FCC) alloys. One type of these materials contain high density nano-sized growth twins or deformation twins 5, 6, 7, 8, 9. However, it is well known that strength and ductility have trade-off relationship in many metallic materials 3, 4. In general, the yield strength of materials is determined by the grain size according to the Hall-Petch relation 2 and the ductility (especially uniform elongation) is governed by the strain hardening rate (, where and are true stress and true strain, respectively) according to plastic instability condition, such as Considére criterion 2. Materials with high strength and high ductility are widely attractive for industrial applications 1.
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