The Effects of Bi and Aging on the Microstructure and Mechanical Properties of Sn-Rich AlloysAuthors: André Delhaise, Doug Perovic, and Polina Snugovsky, Ph.D.
Company: University of Toronto and Celestica, Inc.
Date Published: 5/19/2015 Conference: ICSR (Soldering and Reliability)
Four alloys – Sn-1Bi, Sn-5Bi, Sn-0.7Cu-1Bi, and Sn-0.7Cu-5Bi - were aged at room temperature for 10 days or 28 days. Two of these, Sn-1Bi and Sn-5Bi, were aged at 100oC for 7 days, and were all cooled in air. The microstructure of the samples after solidification and aging were compared using Scanning Electron Microscopy (SEM). Alloy hardness after solidification and aging was measured using a Rockwell hardness tester HR15X with a ¼” Carbide ball indenter. In alloys containing Bi precipitates, these particles became more uniformly distributed with aging. Hardness was observed to not undergo any significant changes after aging, which differs significantly from SAC alloys.
Bismuth, Aging, Microstructure, Hardness
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