Effect of Microstructure Size on Deformation Kinetics and Thermo-Mechanical Fatigue of 63Sn37Pb Solder Joints

Author:

Guo Zhenfeng1,Conrad Hans1

Affiliation:

1. Materials Science and Engineering Department, North Carolina State University, Raleigh, NC 27695-7907

Abstract

An increased cooling rate following reflow produced a decrease in the microstructure size including the size of the colonies, the Pb-rich dendrites and the eutectic phases. The decrease in microstructure size gave an increased creep rate at room temperature and a decrease in the creep stress exponent. Also, thermo-mechanical fatigue crack growth rate decreased and fatigue life increased with the decrease in microstructure size. These effects of the increased cooling rate were attributed to an increase in boundary sliding which could occur from the increase in boundary area with decrease in microstructure size.

Publisher

ASME International

Subject

Electrical and Electronic Engineering,Computer Science Applications,Mechanics of Materials,Electronic, Optical and Magnetic Materials

Reference11 articles.

1. Guo, Z., and Conrad, H., “Computer Modeling of Isothermal Low-Cycle Fatigue of Pb-Sn Solder Joints,” Proc. 43rd Electronics Components Tech. Conf., ECTC, CHMT IEEE, Buena Vista Palance, Orlando FL, June 1–4, 1993, pp. 831–838.

2. Guo, Z., and Conrad, H., “Fatigue Cracking Kinetics and Lifetime Prediction of Electronic Solder Joints,” Proc. ASME/JSME/IEEE Inter Pack’95, Westin Maui, Hawaii, March 26–30, Advances in Electronic Packages, ASME, EEP, V.10–2, 1995, NY, pp. 1129–1141.

3. Bae, K., Guo, Z., Sprecher, A. F., Jung, D., and Conrad, H., “Effect of Compliance on the Fatigue of Solder Joints in Surface-Mounted Electronic Packages,” Proc. Int. Symp. Test. Failure Analysis, ISTFA, 1988, ASM, Metals Park, OH, pp. 53–61.

4. Guo Z. , and ConradH., “Fatigue Crack Growth Rate in 63Sn37Pb Solder Joints,” ASME JOURNAL OF ELECTRONIC PACKAGING, Vol. 115, June 1993, pp. 159–164.

5. Hacke, P. L., Sprecher, A. F., and Conrad, H., “Thermomechanical Fatigue of 63Sn–37Pb Solder Joints,” Thermal Stress and Strain in Microelectronics Packaging, ed., J. H. Lau, Van Nostrand Reinhold, New York, 1993, pp. 467–499.

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