Journal
ACTA METALLURGICA SINICA-ENGLISH LETTERS
Volume 28, Issue 3, Pages 307-315Publisher
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-014-0198-0
Keywords
Cu-1.9Be-0.3Ni-0.15Co alloy; Aging; Microstructure; Mechanical property; Electrical property; Precipitation kinetics
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Funding
- Materials Forming Processing Control and Simulation Laboratory in University of Science and Technology Beijing
- CNMC Ningxia Orient Group Co., Ltd
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In this paper the evolutions of microstructure and mechanical properties of Cu-1.9Be-0.3Ni-0.15Co alloy were studied. The alloys in the condition of the solution treated (soft state) and 37% cold rolled (hard state) were aged at 320 degrees C for different time respectively. The mechanical properties electrical conductivity and microstructure of the alloy aged for different time were analyzed. Additionally the precipitation kinetics of Cu-1.9Be-0.3Ni-0.15Co alloys was investigated. X-ray diffraction and transmission electron microscopy results reveal that both continuous precipitation and discontinuous precipitation existed in the hard-state Cu-1.9Be-0.3Ni-0.15Co alloy during the whole aging process the sequence of continuous precipitation is G.P. zone -> gamma -> gamma' -> gamma. Furthermore the precipitation transformation mechanism of soft-state alloy is homogeneous nucleation while hard-state alloy shows the heterogeneous nucleation (interface nucleation) with the nucleation rate of both states decaying rapidly to zero during aging at 320 degrees C.
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