Investigation on impact strength of the as-soldered Sn37Pb and Sn3.8Ag0.7Cu solder joints View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2008-07-03

AUTHORS

Ning Zhang, Yaowu Shi, Zhidong Xia, Yongping Lei, Fu Guo, Xiaoyan Li

ABSTRACT

Charpy impact specimens of eutectic Sn37Pb and Sn3.8Ag0.7Cu solder joints with U-type notch were prepared to investigate the joint impact strength. The gap sizes of the butt joint were selected at 0.3 and 0.8 mm. Compared with the values of 0.3 mm joint gap, the impact absorbed energies of two solder joints were increased at the joint gap of 0.8 mm. The impact strengths of Sn37Pb joints were higher than those of Sn3.8Ag0.7Cu joints in both cases. From the macrographic observation of the fracture path, when the gap was 0.3 mm, the crack initiation of two solder joints located at the root of U-type notch then propagated along one interface of the joint. For the Sn37Pb joints, the fracture path was not changed at 0.8 mm gap size. However, the fracture path of Sn3.8Ag0.7Cu joint was totally changed and the fracture occurred not at the root of pre-U notch but from one side of the solder/Cu interfaces. From the micrographic observation, the crack of the Sn37Pb joints was concentrated on the Pb-rich layer in the vicinity of interfacial intermetallic (IMC) layer and the fracture morphology mainly appeared to be a ductile-like structure. Meanwhile, the fracture of Sn3.8Ag0.7Cu joints propagated along either the interface of IMC/solder or within the IMC layer and showed a brittle failure mode. More... »

PAGES

499-506

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10854-008-9757-3

DOI

http://dx.doi.org/10.1007/s10854-008-9757-3

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https://app.dimensions.ai/details/publication/pub.1028711098


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