Thermal fatigue properties and grain boundary character distribution in Sn-xAg-o.5Cu (x=1, 1.2 and 3) lead free solder interconnects

S. Terashima, M. Tanaka, Kohei Tatsumi

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Thermal fatigue properties of Sn-xAg-0.5Cu (x=1, 1-2 and 3, mass%) lead free solder interconnects were discussed from the viewpoints of both morphology and grain boundary character distribution. 3Ag showed the longer thermal fatigue life than 1Ag and 1.2Ag. Both cracks, which were initiated by thermal strain, and grain boundary damage due to grain boundary sliding degraded the thermal fatigue lives. From a microstructural observation using orientation imaging microscopy, recrystalllsation of tin grains was observed, and 3Ag suppressed coarsening of tin grains after further thermal fatigue as compared with 1Ag and 1.2Ag. Moreover, 3Ag showed a larger amount of coincidence site lattice boundaries than 1Ag and 1.2Ag. It is suggested that in 3Ag not only smaller tin grains but also larger amount of coincidence site lattice boundaries suppressed crack propagation and grain boundary sliding.

Original languageEnglish
Pages (from-to)60-65
Number of pages6
JournalScience and Technology of Welding and Joining
Volume13
Issue number1
DOIs
Publication statusPublished - 2008 Jan
Externally publishedYes

Fingerprint

thermal fatigue
Thermal fatigue
solders
Tin
Grain boundaries
grain boundaries
tin
Grain boundary sliding
fatigue life
sliding
Fatigue of materials
crack propagation
Coarsening
Crack propagation
Microscopic examination
cracks
damage
microscopy
Cracks
Imaging techniques

Keywords

  • Grain boundary character distribution
  • Lead free solder
  • Orientation imaging microscopy
  • Sn-Ag-Cu
  • Thermal fatigue

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

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title = "Thermal fatigue properties and grain boundary character distribution in Sn-xAg-o.5Cu (x=1, 1.2 and 3) lead free solder interconnects",
abstract = "Thermal fatigue properties of Sn-xAg-0.5Cu (x=1, 1-2 and 3, mass{\%}) lead free solder interconnects were discussed from the viewpoints of both morphology and grain boundary character distribution. 3Ag showed the longer thermal fatigue life than 1Ag and 1.2Ag. Both cracks, which were initiated by thermal strain, and grain boundary damage due to grain boundary sliding degraded the thermal fatigue lives. From a microstructural observation using orientation imaging microscopy, recrystalllsation of tin grains was observed, and 3Ag suppressed coarsening of tin grains after further thermal fatigue as compared with 1Ag and 1.2Ag. Moreover, 3Ag showed a larger amount of coincidence site lattice boundaries than 1Ag and 1.2Ag. It is suggested that in 3Ag not only smaller tin grains but also larger amount of coincidence site lattice boundaries suppressed crack propagation and grain boundary sliding.",
keywords = "Grain boundary character distribution, Lead free solder, Orientation imaging microscopy, Sn-Ag-Cu, Thermal fatigue",
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AU - Terashima, S.

AU - Tanaka, M.

AU - Tatsumi, Kohei

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N2 - Thermal fatigue properties of Sn-xAg-0.5Cu (x=1, 1-2 and 3, mass%) lead free solder interconnects were discussed from the viewpoints of both morphology and grain boundary character distribution. 3Ag showed the longer thermal fatigue life than 1Ag and 1.2Ag. Both cracks, which were initiated by thermal strain, and grain boundary damage due to grain boundary sliding degraded the thermal fatigue lives. From a microstructural observation using orientation imaging microscopy, recrystalllsation of tin grains was observed, and 3Ag suppressed coarsening of tin grains after further thermal fatigue as compared with 1Ag and 1.2Ag. Moreover, 3Ag showed a larger amount of coincidence site lattice boundaries than 1Ag and 1.2Ag. It is suggested that in 3Ag not only smaller tin grains but also larger amount of coincidence site lattice boundaries suppressed crack propagation and grain boundary sliding.

AB - Thermal fatigue properties of Sn-xAg-0.5Cu (x=1, 1-2 and 3, mass%) lead free solder interconnects were discussed from the viewpoints of both morphology and grain boundary character distribution. 3Ag showed the longer thermal fatigue life than 1Ag and 1.2Ag. Both cracks, which were initiated by thermal strain, and grain boundary damage due to grain boundary sliding degraded the thermal fatigue lives. From a microstructural observation using orientation imaging microscopy, recrystalllsation of tin grains was observed, and 3Ag suppressed coarsening of tin grains after further thermal fatigue as compared with 1Ag and 1.2Ag. Moreover, 3Ag showed a larger amount of coincidence site lattice boundaries than 1Ag and 1.2Ag. It is suggested that in 3Ag not only smaller tin grains but also larger amount of coincidence site lattice boundaries suppressed crack propagation and grain boundary sliding.

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KW - Orientation imaging microscopy

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