退火对纳米Al_2O_3粒子弥散强化铜合金显微组织与性能的影响  

Influence of Annealing on Microstructure and Properties of Nano-sized Al_2O_3 Dispersion Strengthened Copper Alloy

作　　者：谭望[1] 汪明朴[1] 程建奕[1] 李周[1] 

机构地区：[1]中南大学材料科学与工程学院

出　　处：《矿冶工程》2004年第2期75-77,80,共4页Mining and Metallurgical Engineering

基　　金：国家高新技术发展"863"计划资助项目 (2 0 0 2AA30 2 50 5)

摘　　要：通过力学性能、电学性能测量和金相、电镜观察对Cu Al2 O3 弥散强化铜合金冷加工和退火态性能和组织的变化进行了系统研究。结果表明 :挤压态合金随冷拉拔变形量增大 ,σb 和σ0 .2 逐渐升高 ,δ逐渐下降 ,电导率则变化甚微。合金经 92 %的变形后 ,σb、σ0 .2 、δ和电导率分别为 490MPa、485MPa、10 %和 91.4%IACS ,其在 40 0～ 10 5 0℃温度范围退火后性能有不同程度的恢复。不同变形量的合金样品 90 0℃ ,1h退火后性能均恢复至挤压态水平 ,且未见再结晶现象。The influence of annealing on the microstructure and properties of nano-sized Al 2O 3 dispersion-strengthened copper alloy are investigated by measurement of mechanical and electrical properties, metallugraphic analysis and electron microscopic obsorvation. The results have shown that with increasing of cold-drawing deformation, the extruded alloy's σ b and σ 0.2 increase and δ decreases gradually, whereas the extruded alloy's electrical conductivity changes very little. After the alloy's cold-drawing deformation is 92%, its σ b,σ 0.2, δ and electrical conductivity reach 490 MPa, 485 MPa, 10% and 91.4%IACS, respectively, and recover to some extent after its annealing at 400～1?050 ℃. After the extruded alloy with different deformation amounts is annealed for 1 h at 900 ℃, its all these properties return to their original level and no recrystallization occurrs in its microstructure. Cold-drawing is favourable for metallurgical combination between powder particles.

关 键 词：弥散强化 显微组织 性能 退火 铜合金 CU-AL2O3 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG166.2[金属学及工艺—金属材料]