Bi-Sn共晶合金薄膜における融解・凝固の透過電顕その場観察

概要

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The thin film of a Bi-Sn eutectic alloy coated with carbon films was melted partially in a transmission electron microscope and solidification processes were observed directly. Melting began along grain boundaries and spread around the region irradiated by an electron beam. The microscopic shape of a solid-liquid interface was uneven. By cooling at a rate of 8.3×10^<-3> K/s a part of a growth interface moved intermittently, and the heterogeneous nucleation and growth of grains occurred at the interface. In general, the grain consisting of a Sn-rich alloy (α phase) grew over a relatively wide region, while the growth of a grain consisting of mostly Bi (β phase) was limited in a small area. Moreover, some grains of β phase were dispersed and others were aligned discontinuously in an a matrix.
日本結晶成長学会の論文
2000-07-15