About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing: Materials Design and Alloy Development IV: Rapid Development
|
Presentation Title |
Towards New High-strength Al-alloys Specifically Designed for L-PBF |
Author(s) |
Giuseppe Del Guercio, David Graham McCartney, Nesma Aboulkhair , Christopher Tuck, Marco Simonelli |
On-Site Speaker (Planned) |
Giuseppe Del Guercio |
Abstract Scope |
Laser-powder bed fusion (L-PBF) has opened new opportunities to process advanced materials with unique microstructures arising from the rapid solidification conditions imposed during the printing process. However, the development of high-strength aluminium (Al) alloys remains limited due to the occurrence of detrimental hot-cracks and scarse availability of custom powders. In this talk, we propose a comprehensive methodology to design and develop novel crack-free high-strength Al-alloys tailored for the L-PBF process. The cracking behaviour of custom compositions is predicted by coupling established models for hot cracking with solidification gradients evaluated using the CALPHAD approach. The calculations are experimentally validated via a detailed microstructural characterisation of arc melted buttons of custom compositions remelted under L-PBF processing conditions. We then show how this method was used to isolate a novel Al-Cu-Ni alloy that, whilst minimising hot-crack-susceptibility, possesses excellent strength, measured indirectly from hardness tests. Preliminary L-PBF processability and tensile performance is then presented. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Aluminum, Solidification |