高速回転撹拌凝固による炭化物系粒子分散強化銅の製作とその性質

抄録

An investigation was made for the electrical and mechanical properties of dispersion-strengthened (DS) coppers compocast at 25 rev/s and with the addition of fine carbide particles in the range of 0.5 to 30 mass% WC, TaC, VC, TiC, NbC, ZrC, Mo₂C, Cr₃C₂ and Al₄C₃. Homogeneous distribution of carbides was observed in the microstructures of the compocast DS coppers except with the addition of Mo₂C, Cr₃C₂ or Al₄C₃. The measured values of electrical conductivity of the DS coppers were 77.9 %IACS at 20 mass%WC, 73.4 %IACS at 20 mass%TaC, 72.0 %IACS at 10 mass%NbC, 85.2 %IACS at 5 mass%TiC and 68.9%IACS at 5 mass%VC. The values of Vickers hardness were 197 at 30 mass%WC, 155 at 30 mass%NbC, 110 at 30 mass%TaC, 158 at 20 mass%VC and 121 at 20 mass%TiC. The values of ultimate tensile strength were 402 MPa at 30 mass%NbC, 357 MPa at 20 mass%TiC, 330 MPa at 20 mass%WC, 269 MPa at 20 mass%TaC and 323 MPa at 10 mass%VC. The values of elongation were 12.9 % at 20 mass%TaC, 10.9 % at 20 mass%WC, 25.2 % at 10 mass%NbC, 21.8 % at 10 mass%VC and 17.5% at 5 mass%TiC.