|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Surface Interactions in Materials
||Formation Behavior of Fe2Al5 Phase in Fe/Molten Al Diffusion Couples
||Takumi Yamada, Kwangsik Han, Kaneharu Okuda, Ryosuke Kainuma
|On-Site Speaker (Planned)
Tongue-structure of η phase observed in hot-dip aluminizing is well-known as extremely brittle phase, thus control of formation behavior is important to inhibit the spalling phenomenon occurred during hot-stamping process of steel sheet. However, the formation behavior is still under discussion. In present study, therefore, formation behavior of η phase was investigated by the hot-dipping method. High purity iron sheets were immersed into molten aluminum maintained at 700oC, where all processes were performed in quartz capsule. Subsequently, samples reacted for various time were quenched in iced water without breaking the capsule. Microstructures and compositions were analyzed by EBSD, FE-SEM and FE-EPMA/WDS. The tongue-structure of η phase grew along <001> direction until 180sec., while randomly tilted with increasing reaction time after 180sec. Interfacial compositions of η/θ were almost constant , whereas that of η/α was drastically changed after formation of other intermediate phases, such as ζ and α`.
||Planned: Supplemental Proceedings volume