|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||In Situ TEM Investigation of Microstructural Evolution in Gas Atomized Al-6061 Powder Particles
||Sriram Vijayan, Benjamin Bedard, Mark Aindow
|On-Site Speaker (Planned)
The recent growth in the cold spray community has led to a renewed interest in understanding the physical metallurgy of gas atomized powders, because metastable phases and other microstructural features are retained in the cold sprayed deposit. As such, the microstructure of such deposits will develop differently from those of conventionally processed bulk materials. In our work we have used a MEMS-based heating holder to perform in situ TEM experiments on gas atomized powder particles. These MEMS holders have excellent thermal stability, and are ideally suited for making real time observations of thermally activated processes at high spatial resolution. Here we present examples of such studies on FIB-cut cross-sectional samples obtained from a gas atomized Al-6061 powder particles. The samples are aged isothermally to observe the transformation of the metastable phases to their equilibrium products. The consequences of these observations for designing powder precursors and/or post-processing routes are discussed.
||Planned: Supplemental Proceedings volume