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Date: | Fri, 4 May 2007 14:38:04 -0500 |
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Where are the photos?
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier
Sent: Friday, May 04, 2007 2:35 PM
To: [log in to unmask]
Subject: Re: [TN] Metalurgists, need assistance
Hi Ingemar,
Looking at pic1, I would not call what I am seeing a "good joint"-it is
an
interfacial separation, and thus the interface [whatever it is] is the
weak. and
unpredictable, link.
Pic3 looks more like a ductile separation-see the directionality of the
cup-like 'voids', in the solder [easy to confirm if the composition is
the same on
both fracture surfaces.] Pic4 looks like the Ni layer is showing
through->the
solder properly wetted in some areas, but not all.
Sn spheres-beats me.
Werner
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