Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第6期    总第171期    2013年6月

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文章编号:1004-0609(2013)06-1586-05
SnSb15合金液-液结构转变的可逆性及熔体状态对凝固的影响
高文龙,张先锋,丰大顺,祖方遒

(合肥工业大学 材料科学与工程学院,合肥 230009)

摘 要: 为了探讨液-液结构转变的可逆性及熔体状态对凝固的影响,利用直流四电极法测量SnSb15合金熔体在三轮连续升降温过程中的电阻率-温度曲线。分析SnSb15合金熔体的不可逆和可逆转变的物理内涵,进而讨论不可逆转变对凝固影响的作用机制。结果表明:SnSb15合金熔体发生了温度诱导的液-液结构转变,其首轮升温过程的转变呈不可逆性,而后续降温及升温过程的转变呈可逆特征;且首轮升温过程的不可逆液-液结构转变显著影响合金的凝固行为和组织,如初生相和包晶相的形核过冷度分别增大9.7和5 ℃,凝固时间分别缩短2.5和4 s,并且凝固组织明显细化。

 

关键字: SnSb15合金;液-液结构转变;可逆性;熔体状态;凝固行为;凝固组织

Reversibility of liquid-liquid structure transition and effects of melt state on solidification of SnSb15 alloy
GAO Wen-long, ZHANG Xian-feng, FENG Da-shun, ZU Fang-qiu

College of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China

Abstract:In order to study the reversibility of liquid-liquid structure transition (L-LST) and the effects of melt state on solidification, the electrical resistivity-temperature curves of SnSb15 melt were measured in three heating and cooling cycles by means of DC four-probe method. The physical connotation of irreversible and reversible L-LST was analyzed, and the effects of irreversible L-LST on solidification were also discussed. The results show temperature induced L-LST occurs in SnSb15 melt. L-LST in first heating process is irreversible, but it is reversible in subsequent cooling and heating processes. Besides, irreversible L-LST can significantly affect the solidification behavior and microstructure, i.e. the undercooling degrees for primary and peritectic phase enlarge 9.7 and 5 ℃, the solidification time shortens 2.5 and 4 s, respectively. Moreover, the solidification microstructures are refined obviously.

 

Key words: SnSb15 alloy; liquid-liquid structure transition; reversibility; melt state; solidification behavior; solidification microstructure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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