| Title | Post heat treatment of additive manufactured AlSi10Mg: On silicon morphology, texture and small-scale properties |
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| Author | Alghamdi, F; Song, X; Hadadzadeh, A ; Shalchi Amirkhiz, B; Mohammadi, M;
Haghshenas, M |
| Source | Materials Science and Engineering: A vol. 783, 139296, 2020 p. 1-12, https://doi.org/10.1016/j.msea.2020.139296 |
| Image |  |
| Year | 2020 |
| Alt Series | Natural Resources Canada, Contribution Series 20210134 |
| Publisher | Elsevier |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Subjects | industrial minerals; Science and Technology; aluminum; silicon; silica, commodity; magnesium; heat conduction; textures |
| Illustrations | schematic diagrams; photomicrographs; photographs; plots; figures; tables |
| Program | CanmetMATERIALS Research
Activities |
| Released | 2020 03 28 |
| Abstract | Post-fabrication heat treatment, including solution treatment (at 520 °C for 1 h) followed by water quenching (WQ), air cooling (AC) and furnace cooling (FC), was performed on a selective laser melted
AlSi10Mg alloy. The objective is to assess the effect of various cooling rates on the microstructure (specifically eutectic-Si morphology) and small-scale mechanical properties, measured by employing a depth-sensing nanoindentation platform, of the
selective laser melted AlSi10Mg alloy. Results show extensive evolutions in the microstructure and the mechanical properties of the heat-treated materials relative to the as-fabricated sample. Upon solutionizing treatment, the eutectic Si is first
fragmented, then spheroidized, and finally coarsened when cooled with slow rates. The microstructural evolution directly affects the mechanical properties, where the as-fabricated and the FC are the hardest and the softest structures, respectively.
This is directly attributed to the size and morphology of the eutectic-Si within the microstructure. The findings of this study could help to adjust the optimized heat-treatment process to fabricate SLM AlSi10Mg parts with desirable microstructure
and mechanical properties. |
| Summary | (Plain Language Summary, not published)
The objective of this study was to assess the effect of various heat treatments on the microstructure and mechanical properties of AlSi10Mg aluminum
alloy fabricated by selective laser melting. Selective laser melting is an additive manufacturing method (3D-printing) used for metals. After fabrication, we subjected the test samples to heat treatment regimes including solution treatment followed
by water quenching, air-cooling and furnace cooling. We analysed the microstructure of heat-treated samples and compared them with not treated ones. We observed clear differences in microstructures using electron microscopy techniques. These
microstructural differences directly affected the mechanical properties. The as-fabricated sample was the hardest and the furnace-cooled sample possessed the softest structures. We attributed these differences to the size and morphology of the
eutectic-silicon particles observed within the microstructure of the aluminum alloy. We showed that after solution treatment, the eutectic silicon particles were first fragmented, then spheroidized, and finally coarsened when cooled at slow cooling
rates. The findings of this study could help achieving optimized heat-treatment parameters to fabricate parts with desirable microstructure and mechanical properties. |
| GEOSCAN ID | 328461 |
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