About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing of Metals: Applications of Solidification Fundamentals
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Presentation Title |
An Oxygen-stabilized Face-centred Cubic Phase in Additively Manufactured Ti-6Al-4V |
Author(s) |
Hao Wang, Qi Chao, Xiangyuan Cui, Zibin Chen, Andrew Breen, Wei Xu, Sophie Primig, Simon Ringer, Xiaozhou Liao |
On-Site Speaker (Planned) |
Hao Wang |
Abstract Scope |
(MURI and AUSMURI Collaborative Research)
The existence of a face-centred cubic (FCC) titanium (Ti) phase in Ti alloys remains under debate over the past decades. In general, Ti has high chemical affinity with interstitials such as oxygen, leading to the formation of intermetallic compounds and dramatically diminishing ductility. Here, we demonstrate that interstitial oxygen can be incorporated into a Ti-6Al-4V alloy to improve its mechanical properties through the formation of an oxygen-containing FCC solid solution phase. This is achieved via selective laser melting, where the combination of high thermal stresses and thermal gradients facilitates a new phase transformation. Electron microscopy, atom probe tomography and density functional theory were used to reveal the crystallography and chemical composition of the new FCC phase. Our mechanical testings revealed that the introduction of the FCC phase dramatically enhances both the strength and ductility of the material. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Titanium, Characterization |