内氧化法制备Al_2O_3颗粒弥散强化Cu合金的组织性能分析与理论校核  

Analysis and theoretical verification on microstructure and properties of Al_2O_3 particle dispersion strengthened Cu alloy prepared by internal oxidation method

作　　者：李美霞 冯亚鹏 谢娟 LI Mei-xia;FENG Ya-peng;XIE Juan(School of Materials Science and Engineering, Hebei University of Engi necring, Handan 056038, China;Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, China)

机构地区：[1]河北工程大学材料科学与工程学院,河北邯郸056038 [2]河北工程大学机械与装备工程学院,河北邯郸056038

出　　处：《粉末冶金工业》2019年第2期24-28,共5页Powder Metallurgy Industry

摘　　要：以Cu-Al合金粉末为原料,采用内氧化方法制备出综合性能优异的Al_2O_3增强铜基复合材料。通过观察试样的显微组织,并测试其拉伸性能,分析存在的各种强化机制并定量计算综合强化效果。结果表明:Cu基体上均匀分布着Al_2O_3弥散相颗粒,颗粒尺寸约6 nm,颗粒间距为30～50 nm,冷拉拔后Cu丝屈服强度高达680 MPa;主要强化机制是弥散强化和热错配位错强化,均匀分布的细小Al_2O_3颗粒阻碍位错运动,强化效果显著;屈服强度实验值略低于理论值692 MPa,原因为Al_2O_3颗粒的团聚和存在多种变体造成的。Al2O3 reinforced copper matrix composites with excellent comprehensive properties were prepared by internal oxidation method using Cu-Al alloy powder as raw material. By observing the microstructure of the sample and testing its tensile properties,the various strengthening mechanisms and quantitative calculation of the comprehensive strengthening effect were analyzed. The results show that Al2O3 dispersed phase particles are uniformly distributed on the Cu matrix,with particle size of about 6 nm and particle spacing of 30-50 nm,and the yield strength of Cu wire after cold drawing reaches 680 MPa. The main strengthening mechanisms are dispersion strengthening and thermal mismatch dislocation strengthening. The uniform distribution of fine Al2O3 particles hinders dislocation movement,and the strengthening effect is remarkable. The experimental value of yield strength is slightly lower than the theoretical value of 692 MPa due to the agglomeration of Al2O3 particles and the existence of various Al2O3 variants.

关 键 词：弥散强化 内氧化法 屈服强度 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG146.11[金属学及工艺—金属学]