Can you do dye and pry on other samples, if any, to find out if they are really cracks?
Could it be a cold solder you micro sectioned?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Grossmann, Guenter
Sent: Wednesday, October 27, 2010 3:37 AM
To: [log in to unmask]
Subject: [TN] Cracks in BGA solderjoints
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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