| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
A-117: Laser Powder Bed Fusion Parametric Investigation of Binary Al-Si Alloys |
| Author(s) |
Holden Hyer, Le Zhou, Joshua Haupt, Sharon Park, Brandon McWilliams, Kyu Cho, Yongho Sohn |
| On-Site Speaker (Planned) |
Holden Hyer |
| Abstract Scope |
The near-eutectic Al-Si alloys such as AlSi10Mg or Al12Si have been widely adopted for laser powder bed fusion (LPBF), because they can be built without excessive pores, and more importantly, without solidification cracking. To explore the composition-dependent buildability, six Al-Si alloy powders, 0.5, 1.0, 2.0, 6.0, 12.6, and 16.0 wt.% Si were produced by gas atomization. Then, 12x12x12 mm cube samples of each composition were produced by LPBF as a function of scan speed at laser powers of 250W and 350W. Regardless of LPBF parameters employed, solidification cracks were observed for the 2 wt.% Si alloy with the highest freezing range near the solubility limit. Minor flaws, mainly due to lack of fusion, were observed for 0.5 and 1.0 wt.% Si alloys with higher liquidus temperature. Sub-grain cellular Al-Si structure was observed for all alloys, and the cellular boundary was observed to be thicker for alloys with higher Si content. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |