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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.52  No.8 (2011)  >  pp.1685-1688

MATERIALS TRANSACTIONS
<<Previous article Vol.52  No.8 (2011)   pp.1685 - 1688 Next article>>

Deformation of Cu-Be-Co Alloys by Aging at 593 K

T. Hasegawa1), Y. Takagawa1), C. Watanabe2) and R. Monzen2)
1) Division of Mechanical Science and Engineering, Kanazawa University
2) Division of Innovative Technology and Science, Kanazawa University


The warping deformation along grain boundaries has been found for thin plates of Cu-1.8 mass%Be-0.2 mass%Co and Cu-1.8 mass%Be-0.2 mass%Co-0.03 mass%Mg alloys aged at 593 K for 3 h after cold rolling to 0% and 20% reduction, but not been detected for the two alloys aged at the same condition after cold rolling to 90% reduction, by surface roughness measurements. The aging produces γ′ precipitates in grains and discontinuous precipitation (DP) cells at grain boundaries in the two alloys after 0% and 20% cold-rolling, but no DP cells in the alloys after 90% cold-rolling. The addition of Mg or the increase in cold-rolling rate decreases the width of DP cells, resulting in reduction in the degree of warping deformation. The warping deformation along grain boundaries can be attributed to the difference between the length changes of the DP cell and the grain interior by the aging.


Keyword:
copper-beryllium alloy, warping deformation, discontinuous precipitation, magnesium addition

Received: February 17, 2011
Accepted: May 06, 2011 , Published online: July 25, 2011
Copyright (c) 2011 The Japan Institute of Metals

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