Precipitation behavior of L12 Al3Zr phase in Al-Mg-Zr alloy
| Autor: | V.K. Portnoy, N. Yu. Tabachkova, V. S. Levchenko, A.G. Mochugovskiy, Walubita Mufalo, Anastasia V. Mikhaylovskaya |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Precipitation kinetics Materials science Precipitation (chemistry) Annealing (metallurgy) Mechanical Engineering chemistry.chemical_element Recrystallization (metallurgy) Zr alloy 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences chemistry Chemical engineering Mechanics of Materials Aluminium 0103 physical sciences Hardening (metallurgy) General Materials Science 0210 nano-technology Nanoscopic scale |
| Zdroj: | Materials Characterization. 139:30-37 |
| ISSN: | 1044-5803 |
| Popis: | Increasing the recrystallization resistance and the mechanical properties of aluminum-based alloys is possible due to the formation of a nanoscale L12-structured Al3Zr phase. Treatment conditions and alloys composition affect the size and density of dispersoids and their final properties. In this work we analyze the decomposition of the supersaturated solid solution in the as-cast Al-3%Mg-0.25%Zr alloy for different annealing modes to understand the precipitation kinetics of the Al3Zr phase in the presence of Mg. We found that both discontinuous and continuous precipitation mechanisms of the Al3Zr phase are possible in the studied low-alloyed material. One-step annealing leads to the formation of coarse (17 nm) spherical precipitates of a coherent L12-structured Al3Zr phase and discontinuously formed fan-shaped aggregations of the same phase. Two-step annealing provided for the maximum precipitation hardening with the formation of high-density nanoscale (7 nm) dispersoids of the Al3Zr phase. This study highlights the importance of the annealing mode of the as-cast material for achieving a high density of the fine L12 structured Al3Zr phase and the maximum hardening effect. |
| Databáze: | OpenAIRE |
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