Abstract
The relationship between fatigue resistance and interfacial microstructure was studied along the interface between the Sn-Pb eutectic alloy and an electroless Ni-P coating. The fatigue resistance of the solder interface was measured from the flexural peel fracture mechanics specimens in the asreflowed, mild-aged, and overaged conditions. While the mild aging had only a marginal effect on the fatigue resistance of the interface, overaging was found to significantly degrade the interfacial resistance to fatigue-crack growth, resulting in a lower fatigue threshold and a much earlier onset of the fast fracture. The effects of the overaging were shown to result from the transformation of the interfacial microstructure, which weakened the crack-sliding resistance in the near-threshold regime and embrittled the interface in the high crack-growth rate regime.
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Liu, P.L., Shang, J.K. Thermal stability of electroless-nickel/solder interface: Part B. Interfacial fatigue resistance. Metall Mater Trans A 31, 2867–2875 (2000). https://doi.org/10.1007/BF02830352
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DOI: https://doi.org/10.1007/BF02830352