Journal
MATERIALS LETTERS
Volume 57, Issue 13-14, Pages 2135-2139Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-577X(02)01212-0
Keywords
copper alloy; age hardening; precipitation
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The aging of Cu-Ni-Si-Zn alloy for lead frame is investigated. The results showed that the peak of hardening effect occurs after aging for about I h and the electrical conductivity increases continuously with aging times. The hardness of the alloy reached a peak at 430-460 degreesC for 2 h and electrical conductivity reached a peak at 500-550 degreesC and continuously decreased afterwards. The cold rolling prior to the aging treatment was used to increase the precipitation rate. The precipitates responsible for the age-hardening effect are disc-shaped delta-Ni2Si, which has an orthorhombic structure. (C) 2002 Elsevier Science B.V. All rights reserved.
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