Dynamic precipitation, segregation and strengthening of an Al-Zn-Mg-Cu alloy (AA7075) processed by high-pressure torsion
| Autor: | Xiaozhou Liao, Yidong Zhang, Ruslan Z. Valiev, Julie M. Cairney, Shenbao Jin, Patrick Trimby, Maxim Yu. Murashkin, Simon P. Ringer, Gang Sha, Jizi Liu |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Diffraction Materials science Polymers and Plastics Precipitation (chemistry) Alloy Metallurgy Metals and Alloys Torsion (mechanics) 02 engineering and technology Atom probe engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Electronic Optical and Magnetic Materials law.invention law High pressure 0103 physical sciences Ceramics and Composites engineering Grain boundary 0210 nano-technology High-resolution transmission electron microscopy |
| Zdroj: | Acta Materialia. 162:19-32 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2018.09.060 |
| Popis: | Combining transmission Kikuchi diffraction, high resolution transmission electron microscopy and atom probe tomography, we investigated an Al-Zn-Mg-Cu alloy (AA7075) processed by high-pressure torsion (HPT) at room temperature and 200 °C, with an objective to reveal the deformation-induced precipitation and segregation of elements at grain boundaries, and to study their appearance at different processing regimes. Although HPT processing at the two temperatures both induced the formation of ŋ phase, ŋ precipitates formed at the two temperatures have different chemical compositions. The increase of the HPT processing temperature increased significantly segregation of Mg and Cu at grain boundaries. The HPT–induced segregation and decomposition of the alloy have a significant effect on its mechanical strength. Our results open a way for achieving advanced mechanical properties in nanostructured metals and alloys by designing their precipitation and segregation through the control of SPD processing regimes. |
| Databáze: | OpenAIRE |
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