| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Materials Design and Alloy Development II
|
| Presentation Title |
A-74: Synchrotron Imaging of the Influence of TiB2 on Cracking Phenomena During Laser Powder Bed Fusion of Al2139 |
| Author(s) |
David T. Rees, Chu Lun Alex Leung, Joe Elambasseril, Sebastian Marussi, Saurabh Shah, Shashidhara Marathe, Milan Brandt, Mark Easton, Peter D. Lee |
| On-Site Speaker (Planned) |
David T. Rees |
| Abstract Scope |
The 2XXX series Al-Cu-Mg-Ag alloys are used in aerospace applications for their specific strength and fatigue properties. The alloy is high cost and hence is used low volume specialist components, an ideal application of laser powder bed fusion (LPBF) additive manufacturing. Unfortunately, the alloy exhibits a strong hot cracking susceptibility, often leading to build failure. We investigated two approaches to minimise the formation of hot cracks by controlling the solidification behaviour by: (1) TiB2 inoculant additions; and (2) in situ optimisation of the LPBF process parameters. To understand the underlying cracking phenomena, we first monitored the LPBF of Al2139 with and without the addition of TiB2 using high-speed synchrotron X-ray imaging for a range of parameters. The microstructure (i.e. grain structure and crack morphology) of additive manufactured builds was examined using high-resolution electron microscopy and X-ray tomography. Our results reveal possible methods to reduce crack formation during LPBF of Al2139. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |