Journal of Electronic Materials

, Volume 40, Issue 6, pp 1409–1415

Characterizing the Mechanical Properties of Actual SAC105, SAC305, and SAC405 Solder Joints by Digital Image Correlation

Article

DOI: 10.1007/s11664-011-1534-z

Cite this article as:
Nguyen, T.T., Yu, D. & Park, S.B. Journal of Elec Materi (2011) 40: 1409. doi:10.1007/s11664-011-1534-z

Abstract

This paper presents the characterization of the mechanical properties of three lead-free solder alloys 95.5Sn-4.0Ag-0.5Cu (SAC405), 96.5Sn-3.0Ag-0.5Cu (SAC305), and 98.5Sn-1.0Ag-0.5Cu (SAC105) at the solder joint scale. Several actual ChipArray® ball grid array (CABGA) packages were cross-sectioned, polished, and used as test vehicles. Compressive tests were performed using a nanocharacterization system over the temperature range of 25°C to 105°C. Images of the cross-sectioned solder joints were recorded by microscope during the tests. The recorded images were then processed by using a digital image correlation (DIC) program to calculate the displacement and strain fields on the solder joints. Finite-element method (FEM) modeling was used to extract the Poisson’s ratio, Young’s modulus, and coefficient of thermal expansion (CTE) of the solder alloys over the temperature range. The methodology developed in this paper enables characterization of the mechanical properties of the actual solder joints at low strain range with high accuracy.

Keywords

Lead-free solder SAC solder joint BGA mechanical properties DIC 

Copyright information

© TMS 2011

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringState University of New York at BinghamtonBinghamtonUSA

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