Abstract
The creep properties of tin-antimony alloys were studied up to the peritectic composition. For tin at temperatures below approximately 150 °C, creep is dominated by pipe diffusion-controlled climb with a stress exponent of 8 and activation energy of 70 kJ/mol. At high stresses, small amounts of impurities cause a transition to a less stress sensitive, most likely solute drag-controlled mechanism. Antimony atoms in solution have only a minor effect on these creep properties. Alloys with higher compositions of antimony contain whiskerlike SbSn precipitates. These alloys exhibit a discontinuous transition in stress exponent and activation energy at an intermediate stress. The creep behavior of these alloys is described fairly well by a composite theory in which the power law stress is divided by a strengthening coefficient, and the strengthening coefficient is related to the precipitate volume fraction and the aspect ratio. Using a friction stress and a strengthening coefficient simultaneously, the behavior of these alloys can be described entirely in terms of tin creep constants. Aging at 100 °C has little effect on the creep properties of the precipitation-strengthened alloys. It is expected that solder alloys strengthened by these precipitates would maintain a significant fraction of their creep strength for significant periods at temperatures below 100 °C.
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McCabe, R.J., Fine, M.E. Creep of tin, Sb-solution-strengthened tin, and SbSn-precipitate-strengthened tin. Metall Mater Trans A 33, 1531–1539 (2002). https://doi.org/10.1007/s11661-002-0075-8
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DOI: https://doi.org/10.1007/s11661-002-0075-8