| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Evolution of Microstructure and Dispersoids in Al-Mg 5xxx Alloys Under Wire + Arc Additive Manufacturing and Permanent Mold Casting |
| Author(s) |
Kun Liu, Ahmed Algendy, Jianglong Gu, X. Grant Chen |
| On-Site Speaker (Planned) |
Ahmed Algendy |
| Abstract Scope |
In the present work, the evolution of microstructure and dispersoids in Al-Mg 5xxx alloys under wire + arc additive manufacturing (WAAM) and permanent-mold casting (PM) has been characterized and compared with the aid of optical microscopy and scanning/transmission electron microscopy. In the as-cast/as-deposited condition, the grains and intermetallics are much finer while the microhardness is much higher in WAAM sample than PM sample. However, during the heat treatment, the formation of dispersoids in WAAM sample is slower with bigger size and lower volume, leading to its lower final micro-hardness than PM sample after 425oC/24h. Besides, the area fraction of dispersoids zone in WAAM sample is lower than PM sample, especially at relative lower heat-treatment temperature (~ 375oC). The formation and distribution of dispersoids during various heat treatments have been characterized and quantified aiming to discover the influence of fabrication methods (PM and WAAM) on the precipitation behavior of dispersoids. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Additive Manufacturing, Phase Transformations |