Characteristics of Nano-alumina Particles Dispersion Strengthened Copper Fabricated by Reaction Synthesis

Alumina dispersion strengthened copper (ADSC) composite was prepared by reaction synthesis (RS) process. Results show that nano-sized γ-Al2O3 particles with about 10 nm in size are homogeneously distributed in copper matrix. A coherent interface relationship with (002)Cu // (133)γ-Al2O3, and [110]Cu//[011]γ-Al2O3 characterizes along the explored interfaces of the composites. All of the interfaces are clear and closely combined with each other. The composites have high properties, the tensile strength can reach 570 MPa and the yield strength can reach 533 MPa at room temperature. Meanwhile, the softening temperature is higher than 1173 K. The electrical conductivity of the sample is 85% IACS and the Rockwell hardness can reach 86 HRB.