Microstructure Characterizations of Hypereutectic Al-Si Alloys with Different Undercooling Levels
Microstructural variation is quantitatively characterized by measured undercooling. For neareutectic Al-13wt%Si alloys, microstructure transitions, which include a phase change from eutectic to primary α-Al dendrite plus eutectic and a morphological change from α-Al dendrite to equiaxed Al grains, were observed with increasing undercooling levels. For hypereutectic Al-Si alloys, microstructure transitions, which include a morphological change of primary and eutectic Si crystals, were also obtained quantitatively by increasing undercooling.
S.-G. Kang and T. Kobayashi
H.S. Kang et al., "Microstructure Characterizations of Hypereutectic Al-Si Alloys with Different Undercooling Levels", Materials Science Forum, Vols. 449-452, pp. 169-172, 2004