Different solidification behaviours of Bi-10wt%Te alloy induced by liquid structural change

被引：5
作者：
Huang, Zhong-Yue [1 ]
Zu, Fang-Qiu [1 ]
Han, Yan-Fa [1 ]
Chen, Zhong-Hua [1 ]
Wang, Zhi-Zhi [1 ]
机构：
[1] Hefei Univ Technol, Liquid Solid Met Proc Inst, Sch Mat Sci & Engn, Hefei 230009, Peoples R China
来源：
PHYSICS AND CHEMISTRY OF LIQUIDS | 2010年 / 48卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Bi-10wt%Te; liquid-liquid structural change; solidification; undercooling; ELECTRICAL-RESISTIVITY; TRANSFORMATION; STATES;
D O I：
10.1080/00319100902913197
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
By means of DC four-probe technique, the temperature dependence of the electrical resistivity (-T) of liquid Bi-10wt%Te alloy has been measured. Two abnormal changes on the -T curve within the temperature ranges of 497-550 degrees C and 639-708 degrees C suggested that two irreversible liquid-liquid structural changes (LLSC) occurred. To explore the effects of the LLSC on the solidification behaviour of the alloy, solidification experiments were carried out. The results show that after experiencing LLSC, there will be enlarged undercooling, much finer microstructures and larger quality of Bi2Te phase. Moreover, the morphology of solidified Bi2Te is changed from dendrite to equiaxed.
引用
收藏
页码：699 / 707
页数：9
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