| 초록 |
High strength of precipitation hardened alloys was achieved by the uniform distribution of fine particles. Discontinuous cellular precipitation, part of the over-aging reaction, greatly decreases the strength of alloys. The conductivity however, steadily increased with an increasing degree of aging due to a resultant decrease in solute concentrations in matrix. Here we show the copper-based alloy with fully discontinuous cellular precipitates possesses a higher conductivity although it has low mechanical properties but it is converted to the high-strength copper alloy practiced by a thermo-mechanical process. We found that the hard intermetallic compounds could fully form and develop throughout the copper matrix during aging process. During cold-drawing, these precipitates were also found to be not only aligned in the axial direction, but plastically deformed in the matrix and take the form of the extraordinary long fibers. It is suggested that the uni-directional alignment of profoundly plastic-deformed intermetallic compound precipitate fibers could improve the strength and conductivity simultaneously. |
