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In situ observation of twin boundary formation at grain-boundary groove during directional solidification of Si

2017; Elsevier BV; Volume: 133; Linguagem: Inglês

10.1016/j.scriptamat.2017.02.028

1872-8456

Kozo Fujiwara, Ryoichi Maeda, Kensaku Maeda, Haruhiko Morito,

Microstructure and mechanical properties

Twin boundary formation at grain boundaries in multicrystalline Si during directional solidification was investigated by in situ observation of the crystal/melt interface. It was clearly shown that a twin boundary was formed on the {111} facet of grain-boundary groove at the crystal/melt interface. The large amount of undercooling in the melt at grain-boundary grooves promoted rapid crystallization and twin boundary formation.