Paper Title:
The Correlation between the Liquid Structure and the Solidification Microstructure of Sn-Cu Lead-Free Solders
  Abstract

The liquid structure of two lead-free solder molten alloys, Sn-0.5Cu and Sn-1.8Cu (wt.%), have been investigated using X-ray diffraction method. The main peak for liquid structure of Sn-0.5Cu is similar to that of pure Sn. A pre-peak has been found in the low Q part on the structure factor S(Q) of Sn-1.8Cu tested under 320°C and the pre-peak decreases its intensity with increasing temperature, but it disappeared finally when the testing temperature reached 350°C. The microstructure of the solder matrix as well as interfacial reaction between liquid solders and Cu substrate was also studied. The structural unit size corresponding to the pre-peak almost equals to magnitude of crystal planar distance of Cu6Sn5 phase. The appearance of a pre-peak may be due to existence of clusters with Cu6Sn5-phase-like structure in the melt. Quantity and size of clusters increases with decreasing temperature but their structural unit size remains constant. Cu6Sn5 phases develop from incorporating and growing of the clusters during solidification, thus result in the correlation between liquid structure and solid microstructure.

  Info
Periodical
Materials Science Forum (Volumes 654-656)
Main Theme
Edited by
Jian-Feng Nie and Allan Morton
Pages
1385-1388
DOI
10.4028/www.scientific.net/MSF.654-656.1385
Citation
X. M. Pan, N. Zhao, R. F. Ding, G. L. Wei, L. Wang, "The Correlation between the Liquid Structure and the Solidification Microstructure of Sn-Cu Lead-Free Solders", Materials Science Forum, Vols. 654-656, pp. 1385-1388, 2010
Online since
June 2010
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