|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||D-53: Relationship between Si Content and Activation Energy of Si Precipitation in Al-Si Alloys
||Yu-Mi Kim, Se-Weon Choi, Young-Chan Kim, Chang-seog Kang
|On-Site Speaker (Planned)
Most of the casting Al-Si alloys contain between 5–22 wt.% Si which improves the castability and feedability. Si precipitation can negatively affect engine components. It is important to study the relationship between Si precipitation and thermal expansion coefficient in Al alloys applied in many high temperature product not only engine component. However, there is little research on the effect of Si precipitating behavior on the thermal expansion behavior of Al-Si alloys. The Al-Si alloy was manufactured by gravity casting using 99.98 wt.% pure Al and 98.5 wt.% Si pellets based on the Si content of the commercial alloy. Those are analyzed using OM and TMA before and after heat treatment for Si precipitation reaction. Activation energies for Si precipitation were also calculated with Kissinger’s equation, and then identified the relationship between Si precipitation rate and Si contents.
||Planned: Light Metals