Ball impact behavior of Sn-Cu (-Ni) lead-free solder joints

H. Tsukamoto, T. Nishimura, S. Suenaga, S. D. McDonald, J. Read, K. Nogita

Research output: Contribution to journalConference articlepeer-review

Abstract

Recent environmental and health concerns regarding the toxicity of lead have facilitated the development of lead-free solder alloys with suitable soldering characteristics and mechanical properties. Compared to the lead-containing solders, however, the lead-free solders are stiffer and less deformable during dynamic loading. In the present study, the shear and pull ball tests were employed to evaluate the impact strength of solder ball attachments. Tests were conducted on as-reflowed and aged Ni-doped and non-Ni-doped Sn-Cu solder ball grid arrays (BGAs) placed on Cu substrates over a wide range of displacement rates. Trace Ni addition to the Sn-Cu solders prevented the growth of the interface intermetallic compounds (IMCs) and made the IMC layer morphology smooth. As-reflowed Sn-Cu-Ni BGA joints show superior properties in high speed shear and pull impact tests.

Original languageEnglish
Pages (from-to)10-16
Number of pages7
JournalMaterials Forum
Volume34
Publication statusPublished - 2008
Externally publishedYes
Event2009 Materials and AustCeram Conference, MAC 2009 - Gold Coast, QLD, Australia
Duration: Jul 1 2009Jul 3 2009

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • General Materials Science

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