Stretching the engineering strain of high strength LPSO quaternary Mg-Y-Zn-Al alloy via integration of nano-Al2O3
| Autor: | Winston Keat How Chee, Jimmy Chan, Richard Kwok, Manoj Gupta, XingHe Tan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Nanocomposite Precipitation (chemistry) 020502 materials Mechanical Engineering Metallurgy Alloy Stacking Nucleation 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Microstructure 0205 materials engineering Mechanics of Materials Dynamic recrystallization engineering General Materials Science Extrusion Composite material 0210 nano-technology |
| Zdroj: | Journal of Materials Science. 51:4160-4168 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-016-9742-9 |
| Popis: | In the present study, an attempt is made for the first time to reinforce long-period stacking ordered (LPSO) MgY1.06Zn0.76Al0.42 (at.%) alloy with 0.5, 1.0, and 1.5 vol% of nano-Al2O3 particles to form nanocomposites. Microstructure characterization revealed the ability of nano-Al2O3 in inhibiting the formation of 14H LPSO phases in the nanocomposites during solidification. Homogenization at 723 K (450 °C) for 2 h led to the subsequent precipitation of fine Mg-Y-Zn-Al precipitates (≤1 µm) in the nanocomposites. The fine Mg-Y-Zn-Al precipitates and nano-Al2O3 particles were established to be active in promoting dynamic recrystallization (DRX) of α-Mg via particle-simulated nucleation during extrusion, which was responsible for weakening the basal texture in the nanocomposites and improving failure strain. As a result, failure strain was significantly increased from 10.8 % in the monolithic alloy to beyond 15 % in the nanocomposites with the highest strength among nanocomposites achieved in NC5 (nanocomposite reinforced with 0.5 vol% of nano-Al2O3 particles). |
| Databáze: | OpenAIRE |
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