|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Crystallization Pathway in Al-Sm Alloys Prepared by Melt Spinning and Magnetron Sputtering
||Fanqiang Meng, Wenjie Wang, Shihuai Zhou, Matthew F. Besser, Matthew J. Kramer, Ryan T. Ott
|On-Site Speaker (Planned)
Clarification of crystallization pathway is not only helpful for the structural design, but also can provide important insight into the starting amorphous structure. Two Al-Sm amorphous structures realized in melt-spun ribbons (MSR) and magnetron sputtered thin films (STF) exhibit very similar structural order, as measured by HRTEM and HEXRD; yet these two structures devitrify following vastly different pathways. The MSR alloy exhibits a polymorphic transformation to the “big cubic phase” (BCP), while the STF develops pronounced compositional inhomogeneities before the formation of fcc-Al and “big hexagonal phase” (BHCP). In both cases, the initial devitrifying transition consumes the entire sample, after which the resulting crystalline phases follows different pathways. Both pathways eventually converge toward the same phase composition. The difference in the structural motifs between BCP and BHCP and its relationship to an atomic “Gene” in the starting amorphous structures of the MSR and STF is discussed.
||Planned: Supplemental Proceedings volume