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Formation of single and multiple deformation twins in nanocrystalline fcc metals |
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| Authors: | YT Zhu J Narayan JP Hirth S Mahajan XL Wu XZ Liao |
| Affiliation: | 1. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA;2. (RTD) School of Mechanical & Materials Engineering, Washington State University, Pullman, WA 99164, USA;3. School of Materials, Arizona State University, Tempe, AZ 85287, USA;4. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China;5. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia |
| Abstract: | Deformation twins are often observed to meet each other to form multi-fold twins in nanostructured face-centered cubic (fcc) metals. Here we propose two types of mechanism for the nucleation and growth of four different single and multiple twins. These mechanisms provide continuous generation of twinning partials for the growth of the twins after nucleation. A relatively high stress or high strain rate is needed to activate these mechanisms, making them more prevalent in nanocrystalline materials than in their coarse-grained counterparts. Experimental observations that support the proposed mechanisms are presented. |
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