Fabrication and properties of low oxygen grade Al2O3 dispersion strengthened copper alloy
来源期刊：中国有色金属学报(英文版)2004年第1期
论文作者：程建奕 汪明朴 李周 王艳辉 肖从文 洪斌
文章页码：121 - 126
Key words：hydrogen-fired expansion; free oxygen; dispersion strengthen; Cu-Al2O3 alloy
Abstract: The low oxygen grade Al2O3 dispersion strengthened copper alloy without hydrogen-fired expansion was fabricated by the technique of vacuum hot press and hot extrusion. The mechanical and electrical properties measurements and microstructures observation on as-hot extruded, as-cold drawn and as-annealed Cu-Al2O3 alloy were conducted. The results show that the addition of a suitable amount of boron in the alloy can lower the residual free oxygen content and then inhibit the hydrogen-fired expansion. The density,σb,σ0.2, hardness,δand electrical conductivity of the alloy reach 8.86 g/cm3(relative density of 99.6%), 340 MPa, 250 MPa, HB95, 24% and 93%(IACS) respectively after hot extruded with the extrusion ratio of 30∶1. Its properties have no change after annealed at 900℃for 1 h. Its strength increases after cold drawing, while its ductility and electrical conductivity drop gradually. Various properties of the cold drawn alloy can recover to those of as-extruded after annealed at 900℃for 1 h without the occurrence of recrystallization.
