メカニカルアロイング法による酸化物および炭化物分散強化銅の開発

概要

論文の詳細を見る
A new process is proposed and tested in order to prepare oxide- and carbide-dispersion-strengthened coppers, combining the mechanical alloying using elemental powders as starting materials and following heat-treatment. The oxide-dispersion-strengthened coppers prepared in the present study did not show good mechanical properties because of the remarkable growth of oxide particles and the separation of pure copper from alloyed powder by heating.<BR>In copper-transition metal-carbon systems, although the mean particle sizes of carbides precipitating in mechanically alloyed podwers increased slightly as the heating temperature increased, they were smaller than those of oxides. The. thermal stability of carbide-dispersion-strengthened copper was better than that of oxide-dispersion-strengthened copper. Mechanical properties of the carbide-dispersion-strengthened copper was excellent. For example, the ultimate tensile strength of 2.5 vol%carbide alloy was 650-725 MPa, and the elongation was 11-12%. The electric conductivity was improved up to 80 %IACS in 2.5vol%TiC-dispersion-strengthened copper by heating at 1273 K for 18.0 ks or at 1323 K for 7.2 ks. It was concluded that the carbide-dispersion-strengthened copper was superior than the others.
社団法人粉体粉末冶金協会の論文