Influence of asymmetrical waveform on low-cycle fatigue life of micro solder joint

Yoshihiko Kanda, Yoshiharu Kariya

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The effects of waveform symmetry on the low-cycle fatigue life of the Sn-3.0Ag-0.5Cu alloy have been investigated, using micro solder joint specimens with approximately the same volume of solder as is used in actual products. Focusing on crack initiation life, fatigue tests on Sn-Ag-Cu micro solder joints using asymmetrical triangular waveforms revealed no significant reduction in fatigue life. A slight reduction in fatigue life at low strain ranges caused by an increase in the fatigue ductility exponent, which is the result of a weakening microstructure due to loads applied at high temperature for long testing time, was observed. This was due to the fact that grain boundary damage, which has been reported in large-size specimens subjected to asymmetrical triangular waveforms, does not occur in Sn-Ag-Cu micro size solder joints with only a small number of crystal grain boundaries.

Original languageEnglish
Pages (from-to)238-245
Number of pages8
JournalJournal of Electronic Materials
Volume39
Issue number2
DOIs
Publication statusPublished - 2010 Feb

Fingerprint

fatigue life
solders
Soldering alloys
waveforms
Fatigue of materials
cycles
grain boundaries
testing time
Grain boundaries
fatigue tests
crack initiation
ductility
Crack initiation
exponents
Ductility
damage
microstructure
symmetry
products
Crystals

Keywords

  • Asymmetrical waveform
  • Lead-free solder
  • Low-cycle fatigue
  • Microstructure
  • Miniature testing
  • Sn-Ag-Cu

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Influence of asymmetrical waveform on low-cycle fatigue life of micro solder joint. / Kanda, Yoshihiko; Kariya, Yoshiharu.

In: Journal of Electronic Materials, Vol. 39, No. 2, 02.2010, p. 238-245.

Research output: Contribution to journalArticle

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