Journal of Electronic Materials

, Volume 38, Issue 12, pp 2770–2779

Nucleation Control and Thermal Aging Resistance of Near-Eutectic Sn-Ag-Cu-X Solder Joints by Alloy Design

  • Iver E. Anderson
  • Jason W. Walleser
  • Joel L. Harringa
  • Fran Laabs
  • Alfred Kracher
Article

Abstract

Elemental (X) additions to Sn-3.5Ag-0.95Cu (SAC3595) solder were developed with minimal (<0.25 wt.%) concentration to avoid pro-eutectic Ag3Sn blades by reducing undercooling (ΔT) and to eliminate thermal-aging-induced embrittlement. Calorimetry and microstructure results on simple Cu/Cu joints identified 0.21Zn, 0.10Mn, and 0.05Al as sufficient to reduce undercooling below that for SAC3595 and to eliminate Ag3Sn blades. A 211°C melting onset for the X = Mn alloys also suggested the discovery of a new quaternary eutectic. Shear testing and microstructure analysis of larger joints showed that 0.05Al and 0.21Zn additions resulted in reduced as-soldered strength (30 MPa), like Sn-0.95Cu, but all joints showed ductile failure at about 30 MPa after 1000 h at 150°C.

Keywords

Pb-free solder (Zn, Mn, Al) additions undercooling Ag3Sn blades shear strength thermal aging 

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Copyright information

© TMS 2009

Authors and Affiliations

  • Iver E. Anderson
    • 1
    • 2
  • Jason W. Walleser
    • 2
  • Joel L. Harringa
    • 1
  • Fran Laabs
    • 1
  • Alfred Kracher
    • 1
  1. 1.Ames Laboratory (USDOE)Iowa State UniversityAmesUSA
  2. 2.Materials Science and Engineering DepartmentIowa State UniversityAmesUSA

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