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June 2006

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Subject:
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Thu, 1 Jun 2006 16:53:46 EDT
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Hi Karen,
You do notsay whether the rolled Cu foil you are using in fully or partially
annealed. Without annealing, the Cu grains are needle-like in the rolling
direction producing very high ductility values and thus good bending
characteristics in that direction. With annealing, the grains are almost equiaxed and have
essentially the same ductility [much higher in the XM-direction, lower in the
M-direction] in all directions. The tear strength for the non-annealed foil
would also be quite different in X- and XM.



Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com

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