Hi Technetters

I have an effect in BGA solder joints that I have never seen before.
In microsections and in FIB preparations I see cracks between the IMC and a slightly darker region towards the Ni which I assume to be a P enriched zone of the Ni. However, the cracks are somewhere in the width of the solder joint and they are quite short running out to a row of pores that look somehow like Kirkendall voids.
Is there still a possibility to place one or two pictures? Kim's IPC site doesn't work.

Best regards

Günter 



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