内氧化制备Al_2O_3/Cu复合材料组织性能研究  

Microstructure and Properties of Al_2O_3/Cu Composites Prepared by Internal Oxidation of Cu-Al Alloy

作　　者：张晓楠[1] 赵冬梅[1] 董企铭[2] 刘平[1] 任凤章[1] 田保红[1] 

机构地区：[1]河南科技大学材料科学与工程学院 [2]河南工业大学

出　　处：《特种铸造及有色合金》2007年第2期142-144,共3页Special Casting & Nonferrous Alloys

基　　金：河南省重点攻关项目(50571035)

摘　　要：采用内氧化工艺,用Cu2O粉作氧化剂,在900℃下使Cu-Al合金薄平板内氧化,获得Al2O3/Cu复合材料,研究Al2O3/Cu复合材料的组织特征及性能。结果表明,复合层中Al2O3颗粒呈弥散状分布;复合层表层和内部的晶粒大小明显不同,表层处晶粒比内部的细小,固溶在Cu基体内部的Al内氧化时以Al2O3形态从基体析出,弥散分布的Al2O3颗粒强化了铜基体,表面显微硬度提高。与固溶在Cu基体中的Al原子相比,Al2O3对电子的散射要小得多,因而内氧化析出Al2O3后电导率升高。Al2O3/Cu复合材料薄板随着冷加工变形量的增加,氧化颗粒与位错的缠结越严重。Al_2O_3/Cu composites were prepared by internal oxidation of Cu-Al sheet at 900 ℃ to investigate the microstructure and properties of the composites, in which the Cu_2O powder was used as oxidizer. The results indicate that the Al_2O_3 particles are dispersively distributed in the diffusion zone. The grain size in surface and inner of diffusion zone is sharply different, finer in the surface than in the inner. The micro-hardness of surface of diffusion zone can be improved due to Al_2O_3 disperoids strengthening Cu matrix. Compared with solid soluted Al atom in Cu matrix, the Al_2O_3 disperoids has slightly affected the electron diffraction, resulting in the increase of electric conductivity after Al_2O_3 precipitation. With increase of deformation rate of Al_2O_3/Cu sheet in case of cold working, the tangle of Al_2O_3 disperoids with dislocation becomes worse and worse.

关 键 词：AL2O3/CU复合材料 内氧化法 电导率 显微硬度 

分 类 号：TB331[一般工业技术—材料科学与工程]