| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Applications of Solidification Fundamentals
|
| Presentation Title |
3D Characterisation of Cracks Formed in AA2024 and Implications for Alloy Design |
| Author(s) |
Giuseppe Del Guercio, Marco Simonelli, Nesma Aboulkhair, Graham McCartney, Chris Tuck |
| On-Site Speaker (Planned) |
Giuseppe Del Guercio |
| Abstract Scope |
Solidification cracking is one of the major issues in the development of Laser-Powder Bed Fusion (L-PBF) of high strength Al-alloys. Weldability and cracking indices developed for processes where single heating/cooling profiles are imposed present shortcomings in predicting cracking behaviour during L-PBF - where materials experience multiple thermal cycles. In this talk, we investigate the origins of the cracking phenomena in the aluminium alloy AA2024, to expose the merits and limitations of commonly used solidification cracking indices in the context of L-PBF. The cracks’ formation in printed AA2024 with standard ASM and custom alloying elements’ range is characterised using a pFIB-FEGSEM to understand the effects of chemical composition, precipitation of second phases and crystallographic texture on the cracking phenomena. Such fundamental understand is of paramount importance and will be discussed in relation to a newly proposed alloy design strategy for high strength aluminium alloys for L-PBF. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Aluminum, Solidification |