ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The lead-free casting solders Sn-3.5Ag-xCo (x = 0, 0.1, 0.5 and 1.0 mass%, respectively)were subjected to isothermal aging at 150ºC for 0, 1008 and 2016 h, respectively. Thenanoindentation methodology was employed herein to assess the mechanical properties. Inparticular, the strain rate sensitivity index value was derived from the creep deformation at thedwell time of the target constant load using Mayo-Nix theory. Basically, there is no remarkabletendency of the variation of Young’s modulus after aging, while to some extent, the hardness of thealloys drops. The strain rate sensitivity index value continues to decrease with the prolonged agingtime. The solder grain growth and the coarsening of the intermetallics namely, Ag3Sn and CoSn2,are responsible for the mechanical evolution of the alloys. The 1.0% (mass%) Co additive improvedthe hardness of the solder alloy, and caused the decrease of the strain rate sensitivity value
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.209.pdf
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