Effect of melting and microstructure on the microscale friction of silver-bismuth alloys

Bo He*, Gautam Ghosh, Yip Wah Chung, Qian Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)275-282
Number of pages8
JournalTribology Letters
Volume38
Issue number3
DOIs
StatePublished - Jun 2010

Keywords

  • Coefficient of friction
  • Indentation
  • Liquid metal lubrication
  • Low melting-point alloy
  • Nanoscale melting
  • Phase diagram

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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