급속응고한 Cu-(0.65, 0.85) wt % Zr 합금분말의 미세조직과 압출재의 기계적 성질에 관한 연구 = A Study on the Microstructures of Rapidly Solidified Cu-(0.65, 0.85) wt % Zr Alloy Powders and the Mechanical Properties of Extrudates

다국어 초록 (Multilingual Abstract)

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.