Mechanical properties and corrosion resistance of the fine grain structure of Al–Zn–Mg–Sc alloys fabricated by friction stir processing and post-heat treatment
| Autor: | H.T. Dai, Z.Y. Ma, L.L. Wei, Bing Zhang, Y.F. Hou, C.Y. Liu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Equiaxed crystals Friction stir processing Fine grain Materials science Mechanical Engineering Alloy Metallurgy 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Corrosion Mechanics of Materials 0103 physical sciences engineering General Materials Science Grain boundary 0210 nano-technology Ductility |
| Zdroj: | Materials Science and Engineering: A. 785:139393 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2020.139393 |
| Popis: | In this study, Al–Zn–Mg–Sc alloys with different microstructures were fabricated by friction stir processing (FSP) and different post-heat treatments. The structure with fine equiaxed grains and a high density of η phases were obtained in the alloys after FSP. Post solid-solution treatment (ST) and artificial aging (AA) led to the η phases dissolute and η′ phases precipitate in the FSP Al–Zn–Mg–Sc alloys, respectively. The fine grain structure in the high rotation rate FSP alloy can be well retained during heat treatment owing to the grain boundary (GB) pinning effect of nanosized Al3(Sc,Zr) phases. However, the pining force caused by the Al3(Sc,Zr) phases did not inhibit the coarsening of the grains in the low rotation rate FSP sample during ST. After AA alone or AA and subsequent ST, the FSP Al–Zn–Mg–Sc alloys exhibited good strength, high ductility, and well corrosion resistance owing to the high densities of their η′ phases and fine grains. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect