| 摘要 |
<p>The present invention relates to a Cu-Co-Si-Zr alloy material which contains 1.0-2.5 wt% of Co, 0.2-0.7 wt% of Si and 0.001-0.5 wt% of Zr with the elemental ratio Co/Si being 3.5-5.0. The Cu-Co-Si-Zr alloy material contains second phase particles having a diameter of 0.20 µm or more but less than 1.00 µm at a density of 3,000-500,000 particles/mm2, and has a crystal grain size of 10 µm or less, an electrical conductivity of 60% IACS or more and good bending workability. The alloy material can be produced by setting the temperature of heating that is carried out after casting and before a solution heat treatment to a temperature that is higher than the later-described solution heat treatment temperature by 45°C or more, by setting the cooling rate from the start temperature of hot rolling to 600°C to 100°C/min or less, and by selecting the solution heat treatment temperature from (50 × Co wt% + 775)°C to (50 × Co wt% + 825)°C (inclusive). The aging treatment after the solution heat treatment is preferably carried out at 450-650°C for 1-20 hours.</p> |
