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金属学报  2008, Vol. 44 Issue (4): 467-472     
  论文 本期目录 | 过刊浏览 |
Sn-Cu钎料液态结构的研究
赵宁;潘学民;马海涛;王来
大连理工大学材料工程系
THE LIQUID STRUCTURE OF SN-CU LEAD-FREE SOLDERS
Zhao Ning;;;
大连理工大学材料工程系
引用本文:

赵宁; 潘学民; 马海涛; 王来 . Sn-Cu钎料液态结构的研究[J]. 金属学报, 2008, 44(4): 467-472 .
, , , . THE LIQUID STRUCTURE OF SN-CU LEAD-FREE SOLDERS[J]. Acta Metall Sin, 2008, 44(4): 467-472 .

全文: PDF(450 KB)  
摘要: 利用高温X射线衍射仪测试了Sn-0.7Cu和Sn-2Cu (质量分数, %)钎料在260, 330和400℃的液态结构. 在共晶Sn-0.7Cu钎料熔体中仅存在短程有序结构; Sn-2Cu在260℃下的结构因子曲线小角度区域出现预峰, 表明熔体中除存在短程有序结构外还存在中程有序结构. 中程有序结构与Cu6Sn5团簇的形成有关, 团簇的数量随温度的升高而迅速减少, 在400℃时消失, Cu-Sn间的交互作用不再存在. 通过计算得到了两种钎料合金熔体的相关半径rc和配位数Nmin, 给出了它们随温度的变化趋势. 对径向分布函数(RDF)的Gaussian分解显示, Sn-Cu钎料液态中Cu-Sn团簇的尺寸随着Cu含量的增加而增大.
关键词 Sn-Cu无铅钎料X射线衍射液态结构    
Abstract:The liquid structuer of two molten lead-free solder alloys, Sn-0.7Cu and Sn-2Cu (wt.%), were studied at 260, 330 and 400篊 by using high temperature X-ray diffractometor. Only short range order (SRO) structure was detected in molten Sn-0.7Cu solder under all temperature. A pre-peak was found in the low Q part of the structure factor S(Q) of Sn-2Cu tested under 260篊, implying that there exists not only SRO structure but also medium range order (MRO) structure in molten Sn-2Cu solder. The appearance of pre-peak is related to the existence of Cu6Sn5-phase-like MRO clusters in molten solder. But the amount of Cu-Sn clusters decreased sharply with increasing temperature, and the pre-peak disappeared finally at 400篊 indicating that the temperature is high enough to destroy the bond in Cu-Sn correlations. The correlation raduis rc and the coordination number Nmin of the two liquid solders were obtained by calculation, and then the changing trend of the two parameters with temperature was set out. The result of Gaussian decomposition of the radial distribution function (RDF) shows that the size of Cu-Sn correlations in molten Sn-Cu solders increases with increasing Cu content.
Key wordsSn-Cu    lead-free solder    X-ray diffraction    liquid structure    MRO
收稿日期: 2007-09-12     
ZTFLH:  TG245.1  
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