Title of Presentation - iNEMI
Title of Presentation - iNEMI
Title of Presentation - iNEMI
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• Objectives<br />
Phase 7 – Microstructure Evolution<br />
– The hypothesis for Phase 7 is that the crystallographic orientations <strong>of</strong> the Sn<br />
grains have an impact on tin whisker nucleation and growth, which leads to<br />
whisker growth at certain locations <strong>of</strong> the finish.<br />
– Grain orientation was analyzed with two techniques; EBSD (Electron backscattered<br />
diffraction) (local change) and X-ray diffraction (global change).<br />
– Attempts were made to correlate the locations <strong>of</strong> whiskers after growth tests<br />
to the orientation information <strong>of</strong> surrounding grains prior to tests.<br />
– The ultimate goal is to define what texture a plating finish would have for a<br />
lower propensity <strong>of</strong> whiskers.<br />
• Whisker Growth Tests<br />
– AATC (standard at - 40 o C to 85 o C)<br />
– Storage test (50 o C/50%RH)<br />
Sn unit cell (body centered tetragonal) Matte Sn after FIB Whisker after AATC<br />
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