Microstructure and Hardness of Bi-Containing Solder Alloys After Solidification and AgeingAuthors: André Delhaise, Leonid Snugovsky, Doug Perovic, Polina Snugovsky, Eva Kosiba
Company: University of Toronto and Celestica, Inc.
Date Published: 5/13/2014 Conference: ICSR (Soldering and Reliability)
Samples were aged for 25 and 100 hours at 100oC. Alloy hardness was measured after solidification ageing and quenching using a Rockwell hardness tester (HR15T scale with a 1/16” carbide ball indenter). The microstructures after solidification and after ageing were compared using scanning electron microscopy (SEM). The microstructures undergo significant changes upon ageing. Bi particles become uniformly distributed in the Sn matrix. While the hardness of SAC alloys is reduced after annealing, the hardness of these experimental alloys increases. The hardness gradually increases with increasing Bi content, as well as with increasing Ag content. The effect of solid solution strengthening and precipitation hardening mechanisms on microstructure and properties is discussed.
Bi-containing solder, Ageing, Microstructure, Hardness
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