NDLI: Fatigue properties of base copper materials used in the fabrication of TAB leads

Content Provider	IEEE Xplore Digital Library
Author	Scharr, T.A.
Copyright Year	1991
Description	Author affiliation: Motorola Inc., Phoenix, AZ, USA (Scharr, T.A.)
Abstract	An attempt was made to characterize the mechanical properties of various types of copper foils that are used for TAB (tape automated bonding) fabrication with a special emphasis on fatigue properties. Coffin-Manson plots of strain range versus cycles-to-failure and fatigue ductility values were generated from testing of specimens. In general, the wrought foils showed a high degree of anisotropy with up to a 5 to 1 difference in cycles-to-failure between machined and cross-machined directions. The anisotropy was observed to be much lower in the low-temperature annealable wrought foils, about 1.5 to 1. Observed grain structures of these materials correlated to their anisotropic behavior, with the low-temperature annealable materials showing smaller amounts of directionality in their microstructure. The ED (electrodeposited) coppers tested had fine-grained equiaxial structures with no significant effects from direction of test. Of the samples tested, the ED coppers performed better at low-cycle, high strain rates, while the wrought coppers had the best performance at high-cycle, low strain rates. The results of this work show that the fatigue performance of a particular type or temper of copper is an important consideration when designing a TAB tape.<>
Starting Page	848
Ending Page	853
File Size	392289
Page Count	6
File Format	PDF
ISBN	0780300122
DOI	10.1109/ECTC.1991.163978
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1991-05-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fatigue Copper Fabrication Testing Capacitive sensors Anisotropic magnetoresistance Mechanical factors Annealing Bonding Microstructure
Content Type	Text
Resource Type	Article

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