Abstract
Dense and crack-free Al-6Zn-2Mg (wt%) alloys with 1 wt% (Sc + Zr) addition were additively manufactured by laser powder bed fusion (LPBF) using gas atomized powders. As-built microstructure consisted of small equiaxed grains near the melt pool boundary and columnar grains between adjacent melt pools. Alloying of Sc + Zr promoted the formation of Al3(Sc,Zr) particles, which contributed to the grain refinement. The alloy exhibited outstanding tensile properties (i.e., 418 ± 3 MPa yield strength, 436 ± 3 MPa tensile strength and 11 ± 1% elongation) after heat treatment. The results demonstrate that high strength aluminum alloy can be fabricated by LPBF through alloy design and microstructural control.
| Original language | English |
|---|---|
| Pages (from-to) | 24-28 |
| Number of pages | 5 |
| Journal | Scripta Materialia |
| Volume | 158 |
| DOIs | |
| State | Published - Jan 1 2019 |
| Externally published | Yes |
Funding
This research was sponsored by the U.S. Army Research Laboratory through cooperative agreement # W911NF-17-2-0172 between University of Central Florida and the U.S. Army Research Laboratory. The views, opinions and conclusions made in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the U.S. Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.
Keywords
- Aluminum alloy
- Gas atomized powders
- Laser powder bed fusion
- Microstructure
- Tensile properties
