Micro structures in Bi-based metallic liquid alloys

Bi系液体合金のミクロ構造

上野 広樹; 川北 至信  ; 尾原 幸治*; 田原 周太*; 小原 真司*; 伊藤 真義*; 武田 信一*

Ueno, Hiroki; Kawakita, Yukinobu; Ohara, Koji*; Tahara, Shuta*; Kohara, Shinji*; Ito, Masayoshi*; Takeda, Shinichi*

Bi-Zn alloy system has a two-melt phase separation region, while Bi-Sn system has a eutectic-type phase diagram. To reveal liquid micro structure, neutron and X-ray diffraction experiments were carried out and structural analysis using RMC method was applied. ND experiments were carried out for liquid BiZn at HERMES installed in JRR-3M and for liquid BiSn at SANDALS spectrometer installed in ISIS, UK. XRD experiments with high energy X-ray of 182.6 keV were performed for BiZn () at BL08W beamline in SPring-8. Analysis using RMC revealed that Zn-Zn partial correlations contribute the nearest neighboring distribution and also large fluctuations in medium range in liquid BiZn, while Bi-Bi pair distribution function in eutectic liquid BiSn exhibits substantial temperature variation compared with the other correlations and fluctuations in Bi-Bi bonds grow up on going deep in the eutectic region.