About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Titanium Technology
|
Presentation Title |
Titanium Metal Matrix Composite Formation in Ternary and Quaternary Compositions and Amenability to Laser Powder Bed Fusion Techniques |
Author(s) |
William R. Hixson, Howard Stone, Jonathan D. Poplawsky, James Coakley |
On-Site Speaker (Planned) |
William R. Hixson |
Abstract Scope |
Ti-based metal matrix composites (MMCs) have highly desired qualities, but implementation has been hindered by poor processability. It is recognized that MMCs can be formed in-situ through exploiting the rapid cooling rates of laser powder bed fusion (LPBF). Ternary Ti-Si compositions plus C/Zr and quaternary Ti-Si-Zr plus Al/Sn, targeting invariant reactions to minimize solidification cracking, are examined to compare the effects of typical interstitial elements and substitutional elements, alpha and beta stabilizing elements on LPBF amenability, nanostructure and mechanical properties. In general, the MMCs are amenable to LPBF. Atom probe tomography was used to compare elemental partitioning to CALPHAD predictions. X-ray diffraction and scanning electron microscopy reveals a dependency of crystal structure and nanostructure with alloying addition. The beta matrix is retained on laser melting of Ti-Zr based compositions. Exceptional hardness values are obtained across the MMCs, highlighting very promising material systems that are processable via LPBF. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Additive Manufacturing, Mechanical Properties |