|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||D-67: Primary Si Refinement in Hyper-eutectic Al-Si Alloys Using Metal-oxide Particles
||Jaehyuck Shin, Sehoon Kim, Jinpyeong Kim, Gyeongseok Joo, Siyoung Sung, Beomsuck Han
|On-Site Speaker (Planned)
In general, the microstructures of hyper-eutectic Al-Si alloys have α-Al-Si eutectic and primary Si phases which account for high wear resistance as well as mechanical strength. However, the high Si content in hyper-eutectic Al-Si causes segregation of primary Si and needle-like eutectic Si during solidification, resulting in the property deteriorations.
In this study, using aluminothermic reaction between metal-oxide particles(TiO2) and aluminum melt, the primary Si refining effect by in-situ formed Al2O3 is investigated. With the addition of 0.1wt.% TiO2 in Al-15Si melt, it is observed that the eutectic phases and primary Si particles are refined. The present study reveals that the small amount of various metal-oxide, in which aluminothermic reaction is possible, can be used as microstructure refiners for Al-Si casting alloys.
||Planned: Light Metals