Lattice misorientation evolution and grain refinement in Al-Si alloys under high-strain shear deformation
| Autor: | Digvijay Yadav, Joshua Silverstein, Bharat Gwalani, Anthony Guzman, Cynthia Powell, Yulan Li, Peter V. Sushko, Aashish Rohatgi, Kelvin Y. Xie, Matthew Olszta, Wenkai Fu, Suveen N. Mathaudhu, Arun Devaraj, Praveena Manimunda |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Nanostructure Misorientation Alloy 02 engineering and technology Nanoindentation engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Phase (matter) Lattice (order) 0103 physical sciences Volume fraction engineering General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Materialia. 18:101146 |
| ISSN: | 2589-1529 |
| DOI: | 10.1016/j.mtla.2021.101146 |
| Popis: | The starting alloy microstructure can be tailored to achieve varying degrees of grain refinement and enhance mechanical properties through severe plastic shear deformation during solid-phase processing. Crystal plasticity-based grain misorientation modeling, coupled with systematic pin-on-disk tribometry-based subsurface shear deformation experiments on as-cast Al-xSi alloys (x = 0, 1, 4 at%), was conducted. The post-deformation microstructural analysis, through a combined computational and experimental approach, conclusively shows that the initial volume fraction of the hard Si phase enhances the evolution of local lattice misorientation, leading to efficient grain refinement during severe plastic shear deformation. The shear-deformation–induced nanostructure resulted in more than double the nanoindentation hardness in the processed alloy. |
| Databáze: | OpenAIRE |
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