| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Materials Design and Alloy Development III -- Super Materials and Extreme Environments
|
| Presentation Title |
Development of High Strength and/or Corrosion-resistant Al Alloys with High Printability |
| Author(s) |
Le Zhou, Holden Hyer, Abhishek Mehta, Sharon Park, Thinh Huynh, Brandon McWilliams, Kyu Cho, Yongho Sohn |
| On-Site Speaker (Planned) |
Le Zhou |
| Abstract Scope |
High strength and/or corrosion resistant aluminum alloys with improved printability (i.e., fully dense without flaws) are desired for additive manufacturing such as laser powder bed fusion (LPBF). Two strategies have been proposed and examined for various Al-alloys. The first approach is to in-situ refine the grain structure during LPBF solidification, as demonstrated by Zr and/or Sc modified AA5083, AA6061 and AlZnMg alloys. These modified alloys exhibited bimodal grain structure without cracking compared to large columnar grains with cracking in non-modified alloys. The Al3(Zr,Sc) served as heterogeneous nucleation sites during solidification and further contributed to precipitation strengthening with appropriate heat-treatment. The second approach is to utilize eutectic compositions with minimum freezing range, as demonstrated by AlSi10Mg and Al-10Ce alloys. These near-eutectic alloys typically showed no cracking regardless of LPBF parameters. Exceptional tensile and corrosion properties of these LPBF-specific alloys are documented and compared to wrought alloys of similar composition. |
| Proceedings Inclusion? |
Planned: |