کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4971418 1450523 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Using nanoindentation to investigate the temperature cycling of Sn37Pb solders
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر سخت افزارها و معماری
پیش نمایش صفحه اول مقاله
Using nanoindentation to investigate the temperature cycling of Sn37Pb solders
چکیده انگلیسی
Using nanoindentation and energy dispersive X-ray spectrometry (EDS), we have conducted an investigation into corner failures to elucidate not only the nanomechanical properties of Sn37Pb solder balls but also the effects of temperature cycling tests (TCTs). We found that the hardness of Sn37Pb solder balls was greater in central locations [1.18 ± 0.05 GPa for room-temperature (RT) sample; 1.3 ± 0.05 GPa for TCT sample], but had standard values in corner locations (> 0.2 ± 0.02 GPa). The modulus increased after the TCTs. Nevertheless, the mechanical properties were closely related to the average area of the α-Pb phase. The average area of the Pb-rich region was more stable after the TCTs than that of the RT sample, due to the enhanced mechanical properties of the Sn37Pb solder, suggesting good reliability. From an analysis of average areas in the RT sample, it appears that the Pb-rich solid solution that formed led to weak SnPb bonds near the corner locations. Electron back-scattered diffraction measurements revealed that grains with grain boundaries formed as a result of accelerated TCT cycling. We conclude that SnPb recrystallization was initiated and propagated after the TCTs, followed by propagation to the interfacial region.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microelectronics Reliability - Volume 78, November 2017, Pages 111-117
نویسندگان
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