| Rapidly solidified Cu-(0.65, 0.85) wt.% Zr alloy powders have been produced using high pressure gas atomizer and physical properties of the extrusions of these powders have been investigated. A complete solution of 0.65wt.% Zr in Cu was possible in the rapidly solidified powder. This solubility increment is remarkable on considering the maximum Zr solubility, 0.17 wt.% in pure copper at the eutectic temperature, 980˚C. In the case of the alloy powders, sizes of which are less than∼74㎛, a microcellular structure develops with the cell spacing of 2∼3㎛. From this cell spacing, the cooling rate of the rapidly solidified powders was deduced to be ∼3×10＾5K/sec. The extrudates of Cu-0.65wt.% Zr alloy powders have tensile strength of 450 MPa and electrical conductivity of 85 % IACS. These properties are superior to those reported for the conventional Cu-Zr alloys. |
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