Mechanical fatigue characteristics of Sn-3.5Ag-X (X=Bi, Cu, Zn and In) solder alloys

Yoshiharu Kariya, Masahisa Otsuka

Research output: Contribution to journalArticle

146 Citations (Scopus)

Abstract

In our previous study, the fatigue life of Sn-3.5Ag-Bi alloy was found to be dominated by the fracture ductility of the alloy and to obey a modified Coffin-Manson's law: (Δεp/2D)· Nαf = C, where Δεp is plastic strain range, Nf is fatigue life, and α and = C are nondimensional constants. In this study, copper, zinc, and indium are selected as the third element, and the effect of these elements on the isothermal fatigue properties of Sn-3.5%Ag alloy has been investigated. The relationship between fatigue life and crack propagation rate estimated from load drop curve during fatigue test is also discussed. The addition of copper, indium, and zinc up to 2% slightly decreases the fatigue life of Sn-3.5Ag alloy due to the loss of ductility, while the life still remains higher than that of tin-lead eutectic alloy. The modified Coffin-Manson's equation can also be applied to ternary Sn-3.5Ag-X. It is found that both ductility and fatigue life are significantly responsible for the load drop rate of the alloy, which reflects the extent of crack propagation. The fatigue life of Sn-3.5Ag-X alloy is therefore dominated not by the kinds and amount of third element but by the ductility of each alloy.

Original languageEnglish
Pages (from-to)1229-1235
Number of pages7
JournalJournal of Electronic Materials
Volume27
Issue number11
Publication statusPublished - 1998 Nov

Fingerprint

solders
fatigue life
Soldering alloys
Fatigue of materials
ductility
Ductility
crack propagation
Indium
Coffin-Manson law
indium
zinc
Zinc
Copper
Crack propagation
lead alloys
eutectic alloys
copper
fatigue tests
Tin
tin

Keywords

  • Crack propagation
  • Ductility
  • Fatigue life
  • Isothermal fatigue
  • Lead free solder
  • Reliability
  • Sn-3.5Ag
  • Sn-Ag-Bi
  • Sn-Ag-Cu
  • Sn-Ag-In
  • Sn-Ag-Zn

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy (miscellaneous)

Cite this

Mechanical fatigue characteristics of Sn-3.5Ag-X (X=Bi, Cu, Zn and In) solder alloys. / Kariya, Yoshiharu; Otsuka, Masahisa.

In: Journal of Electronic Materials, Vol. 27, No. 11, 11.1998, p. 1229-1235.

Research output: Contribution to journalArticle

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