발간논문

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Vol.40, No.2, 141 ~ 148, 2002
Title
Transformations : Microstructural Evolution of Strip Cast Al-Mg-Si-X Alloys
박용수Y . S . Park,이민하M . H . Lee,이상복S . B . Lee,김낙준Nack J . Kim
Abstract
A study has been on the microstructure and mechanical properties of strip cast Al6061 alloy with and without 0.5Mn addition. The microstructure of the as-cast alloys is characterized by the presence of Si particles along cell boundaries. It also shows that there is a development of well-defined subgrains caused by hot rolling effect during strip casting. Si particles present along the cell boundaries transform into fine α-AlFeSi particles during solution treatment in the base alloy. There is also a presence of α-AlFeSi particles in the Al matrix. The addition of Mn results in an increase in the volume fraction of α-AlFe(Mn)Si particles in the Al matrix. Due to the increased volume fraction of α-AlFe(Mn)Si particles in the Mn containing alloy, the Mn containing alloy has less amount of Mg_2Si precipitates in the Al matrix than the base alloy. Accordingly, the Mn containing alloy shows lower yield strength but higher ultimate tensile strength due to higher work hardening rate than the base alloy. The present study shows that the strip casting is a viable process for the fabrication of structural Al alloys.
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