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Journal of Materials Science: Materials in Electronics

, Volume 25, Issue 9, pp 3863–3869 | Cite as

Effect of hold time on the mechanical fatigue failure behavior of lead-free solder joint under high temperature

  • Yongxin Zhu
  • Xiaoyan Li
  • Ruiting Gao
  • Chao Wang
Article

Abstract

In this paper, effect of hold time on the low cycle mechanical fatigue failure behavior of Sn3.0Ag0.5Cu solder joint was investigated. Fatigue tests were conducted utilizing trapezoid waveform with four hold times (0, 2, 5, 10 s) under 348 K. The results show that samples tested under waveform with hold time has the faster maximum stress drop rate comparing to that without hold time. Accordingly, the fatigue life of solder joint is declined with increasing hold time. However, there exists a threshold value, and when the hold time exceeds this value, the fatigue life changes little. Stress relaxation occurs during the hold time, which is completed in a short time under high temperature. Deformation of the solder joint is not uniform, which is concentrated in the solder matrix near the substrate. Micro crack initiates at the corner of the solder joint and propagates in the strain concentrated zone with a direction parallel to the applied load. In addition, Creep voids are observed from the fracture morphology of solder joints tested with hold time, which nucleate at the slip bands and the dendrite boundary tensile ledges. Moreover, the fracture morphology appears an inter-granular rupture mode. However, for solder joints tested without hold time, the rupture mode is trans-granular with some dimples dispersed on the morphology.

Keywords

Fatigue Fatigue Life Solder Joint Fatigue Test Slip Band 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This study was financially supported by National Natural Science Foundation of China (No. 51275007) and Key Project of Beijing Educational Committee Scientific Research Plan (No. KZ201410005009), which were acknowledged.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Yongxin Zhu
    • 1
  • Xiaoyan Li
    • 1
  • Ruiting Gao
    • 1
  • Chao Wang
    • 1
  1. 1.School of Materials Science and EngineeringBeijing University of TechnologyBeijingPeople’s Republic of China

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