Abstract
This article reports an investigation of the effect of melting and microstructure on the microscale friction of several silver–bismuth alloys using a high-temperature nanoindentation-tribotesting system. These studies showed that friction increases with temperature before melting. We modeled these results as due to the softening of the alloys with increasing temperature, which appears to adequately explain the experimental trend. The friction behavior upon melting depends on the alloy composition. For some alloy composition, friction was observed to exhibit a sharp decrease upon melting, while for another alloy composition, friction was observed to keep increasing with temperature. This unusual behavior can be explained by the difference in microstructure and phase composition as a function of temperature among different Ag–Bi alloys.
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Acknowledgments
The authors would like to express their sincere gratitude for the financial support from US Office of Naval Research (MURI N00014-04-0599), and US Department of Energy (DE-FC26-04NT42263), as well as the gift support by the Taiho Kogyo Company to B. He and Q. Wang. However, any opinions, findings, conclusions, or recommendations expressed herein are those of the authors and do not necessarily reflect the views of the sponsors. The authors would also like to thank Dr. Jim Smith from Micro Materials Ltd. for his helpful suggestions.
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He, B., Ghosh, G., Chung, YW. et al. Effect of Melting and Microstructure on the Microscale Friction of Silver–Bismuth Alloys. Tribol Lett 38, 275–282 (2010). https://doi.org/10.1007/s11249-010-9606-4
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DOI: https://doi.org/10.1007/s11249-010-9606-4