| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Additive Manufacturing: Materials, Alloy Development, Microstructure and Properties
|
| Presentation Title |
Microstructure and Mechanical Property of Additively Manufactured Zr-modified AA6061 Alloy |
| Author(s) |
Le Zhou, Abhishek Mehta, Holden Hyer, Thinh Huynh, Sharon Park, Devin D. Imholte, Nicolas E. Woolstenhulme, Daniel M. Wachs, Yongho Sohn |
| On-Site Speaker (Planned) |
Le Zhou |
| Abstract Scope |
Aluminum alloy (AA) 6061 suffered from solidification cracking when manufactured by laser powder bed fusion (LPBF) regardless of processing parameters. To improve its printability without challenging the equipment, AA6061 is modified by alloying with 1wt.% of Zr. In this work, powders of AA6061 and AA6061+Zr were gas atomized and used to manufacture samples by LPBF for microstructural characterization and mechanical testing. Cracks were eliminated for AA6061+Zr samples at all processing parameters. Large columnar grains observed in AA6061 samples were disrupted with Zr addition, and fine columnar and equiaxed grains formed in the AA6061+Zr alloy. The as-built AA6061+Zr with nearly-full density exhibited a yield stress of 210MPa and fracture strain of 27%. After T6 heat treatment, the yield stress improved to 300MPa while fracture strain was 14%, which is slightly better than conventional T6 AA6061 alloy. Microstructure and mechanical properties were correlated to the processing parameters and heat treatment. |