Reversibility of the Liquid-liquid Structure Transition in Sn-70Bi Alloy and its Solidification Behavior

Zhou Bing1; Zu Fangqiu1; Yang Shubin2; Shao Chunwen2; Liu Xiaomao2; Na Qingyang2

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Reversibility of the Liquid-liquid Structure Transition in Sn-70Bi Alloy and its Solidification Behavior
Issue 2, Pages: 160-162(2008)
Published： 2008 ，
DOI：

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[1]周兵,祖方遒,杨树斌,邵春文,刘小毛,那庆阳.Sn-70Bi合金熔体结构转变的可逆性及其凝固行为[J].特种铸造及有色合金,2008(02):160-162+82.

Zhou Bing1, Zu Fangqiu1, Yang Shubin2, et al. Reversibility of the Liquid-liquid Structure Transition in Sn-70Bi Alloy and its Solidification Behavior. [J]. Special Casting & Nonferrous Alloys (2):160-162(2008)
[1]周兵,祖方遒,杨树斌,邵春文,刘小毛,那庆阳.Sn-70Bi合金熔体结构转变的可逆性及其凝固行为[J].特种铸造及有色合金,2008(02):160-162+82. DOI：

Zhou Bing1, Zu Fangqiu1, Yang Shubin2, et al. Reversibility of the Liquid-liquid Structure Transition in Sn-70Bi Alloy and its Solidification Behavior. [J]. Special Casting & Nonferrous Alloys (2):160-162(2008) DOI：

摘要

利用直流四电极法研究了Sn-70Bi合金在液相线以上数百度温度范围内发生的熔体结构转变;在此基础上

进一步探讨了熔体结构转变的可逆性及其对凝固的影响。试验结果表明

Sn-70Bi合金所发生的熔体结构转变部分可逆

分析认为主要与Sn的熔体结构有关

且熔体结构转变对其凝固行为及组织有较大的影响。发现结构变化后的熔体凝固过冷度显著增大

初生相和共晶相组织明显细化。

Abstract

The liquid-liquid structure transition of the Sn-70Bi alloy at more than liquidus in range of hundreds temperature has been investigated by direct current four-probe method.The reversibility of liquid-liquid structure transition and its influence on the solidification of Sn-70Bi alloy have been analyzed based on above mentioned result.It was found that the liquid-liquid structure transition of Sn-70Bi alloy exhibits partial reversibility

which is mainly related to the Sn molten structure

and the structure transition has obviously affect the solidification behavior and microstructure of the Sn-70Bi alloy.The under-cooling degree of the liquid-liquid structure transition melt can be greatly increased

which obviously refine the primary phase and eutectic phase.