| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Materials Design and Alloy Development II
|
| Presentation Title |
Alloy-dilution Effects and Mechanical Response in Wire-arc Additively-manufactured Alloy-alloy Composites Built Using Ti-6Al-4V and Commercially-pure Titanium |
| Author(s) |
Alec E. Davis, Cameron Breheny, Jonathon Fellowes, Uzoma Nwankpa, Filomeno Martina, Jialuo Ding, Thays Machry, Philip Prangnell |
| On-Site Speaker (Planned) |
Alec E. Davis |
| Abstract Scope |
The feasibility of using high deposition rate Wire-Arc Additive Manufacturing (WAAM) to print dual-alloy microstructure ‘Alloy-Alloy composites’ (AACs) has been explored. Alternating wire feeds of commercially-pure Ti (CPTi) and Ti-6Al-4V (Ti64) were used to print an AAC component with a dual-‘phase’ microstructure, which was characterised using mechanical testing, electron microscopy, and electron probe microanalysis. The results show that, due to a high level of dilution during deposition and efficient liquid-phase mixing, the component consisted of layers with an alternating bimodal composition, where each Ti64 and CPTi track deposit had a composition leaner or richer, respectively, than the starting wire compositions. The effects of chemical mixing on the fracture behaviour and microstructure are explored, as well as the surprising result that using alternating alloys promoted β-grain nucleation and refined the normal coarse columnar grain structure seen in WAAM deposits. The impact of these findings on future AAC WAAM research is discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |