挤压态Cu-Al_2O_3弥散强化铜合金组织结构与强化机制的定量探讨  

Microstructure and Strengthening Mechanism of the Al_2O_3 Dispersion Strengthened Copper Alloy as Hot-extrusion

作　　者：邓楚平[1] 黄伯云[1] 潘志勇[2] 

机构地区：[1]中南大学粉末冶金研究院,湖南长沙410083 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《湖南大学学报（自然科学版）》2006年第1期94-97,共4页Journal of Hunan University:Natural Sciences

基　　金：国家863高技术研究发展计划资助项目(2002AA302505)

摘　　要：通过力学性能测试、金相和透射电镜观察等手段研究了热挤压态Cu-0.12 Al2O3弥散强化铜合金的组织与性能．结果表明：挤压态Cu-Al2O3弥散强化铜合金的主要强化机制是细晶强化和弥散强化．细小的Al2O3相钉扎位错，强烈抑制基体的再结晶，造成材料小晶粒、多晶界效应，其平均亚晶粒大小仅为2～4μm，同时对不同强制机制对合金强度的贡献进行了定量计算，计算值与实验值吻合较好．The structure and property of the Cu-Al2O3 alloy as hot-extrusion was studied by means of mechanical property measurement, OM and TEM observation. The results showed that the strengthening mechanism of the alloy as hot-extrusion was mainly dispersion strengthening and fine-crystal strengthening. The fine Al2O3 could pin up dislocations and effectively restrain matrixes＇ reerystallization, causing fine grain and multigrain boundary. The average size of the subgrains was 2～4 μm. The quantitative research on the strengthening mechanisms of precipitation strengthening was alto discussed.

关 键 词：CU-AL2O3 弥散强化 热挤压 

分 类 号：TG146[一般工业技术—材料科学与工程]