|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Solidification Processing of Light Metals and Alloys: An MPMD Symposium in Honor of David StJohn
||In Situ Observation of Nanoparticle-enabled Diffusion Control by High-speed Synchrotron X-ray Imaging
||Joseph Volpe, Qilin Guo, Cang Zhao, Lianghua Xiong, Tao Sun, Lianyi Chen
|On-Site Speaker (Planned)
Nanoparticles assembled at the phase interface were recently hypothesized to control diffusion based on ex-situ characterization. However, the nanoparticle-enabled diffusion control mechanism has not been verified by in-situ evidence, because of the challenges with in-situ observation. In this study, the influence of nanoparticles assembled at the phase interface on diffusion is investigated through in-situ high-energy high-speed synchrotron X-ray imaging during laser melting of pre-cast alloys. Nanoparticle-enabled interfaces were observed to reduce the calculated diffusion coefficient by at least one order of magnitude compared to that of nanoparticle-absent interfaces. These findings provide in-situ evidence of nanoparticle-enabled diffusion control, which is essential for further advancing this new microstructure control approach for various applications.