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Tic 처리한 Al 및 아공정 Al-Si 합금의 결정립 미세화에 미치는 첨가원소의 영향
한윤성,McCartney, D.G. 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.7
Al-Ti-C grain refiners form a relatively new alternative to the existing class of Al-Ti-B type grain refiners for achieving fine equiaxed structures in aluminum alloys during casting and solidification. The present study was carried out to investigate the influence of Al-Ti-C master alloys on the grain size of high purity aluminum and hypoeutectic Al-Si alloys. It is well known that typical alloying elements affect significantly the grain refining performance in hypoeutectic Al-Si alloys. This study investigates the relationship between grain refining efficiency and concentrations of Fe and Si in aluminum alloys. It has been found that grain reflnement was successful when using small addition of Al-3 wt, %Ti-0.15.wt.%C master alloy(0.006wt. % Ti addition levels) in hypoeutectic Al-Si alloys. Furthermore, several factors such as holding time, alloy composition, pouring and temperature had an influence on the grain refinement performance.
Intermetallic Phase Formation in Directionally Solidified Al-Si-Fe Alloy
Han, Y.S.,Choi, J.O.,Choi, C.O.,McCartney D.G. 대한금속재료학회 2004 METALS AND MATERIALS International Vol.10 No.1
The present study has been undertaken to better understand the solidification behavior of Al-Si-Fe alloys containing 7 wt.% Si and 0.9 wt.% Fe, with particular regard to the formation of phase during controlled solidification and influence of growth rates on intermetaIlic phase selection. The alloys studied were Al- 7%-0.9Fe alloys, which were produced by a modified Bridgman solidification arrangement. These allays were solidified unidirectionally with different growth rates (1-30 mdmin). The solidified microstructure of these alloys consists of the growth of primary aluminum and multiple second phase reactions.