Process for producing copper-based alloys having high strength a

Details Process for producing copper-based alloys having high strength a Process for producing copper-based alloys having high strength a

1991-11-14

1992-09-15

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148432, 420496, C22C 900, C22F 108

Patent

active

051474697

ABSTRACT:
Copper-based alloys suitable for use as materials in fabricating electric and electronic parts as typified by leadframes and having high strength and high electric conductivity can be produced by a process which comprises the steps of preparing a copper-based alloy consisting essentially of 0.01- 3.0 wt % Co and 0.01- 0.5 wt % P with the balance being Cu and incidental impurities, quenching said alloy from a temperature not lower than 750.degree. C. down to 450.degree. C. and below at a cooling rate of at least 1.degree. C./sec, heat treating the quenched alloy at a temperature of 480.degree.-600.degree. C. for 30-600 minutes, cold working said alloy for a working ratio of 20-80%, further heat treating the alloy at a temperature of 440.degree.-470.degree. C. for 30-600 minutes, and subsequently performing cold working for a working ratio of at least 50% and heat treatment at 380.degree. C. and below.

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