高塑高强纳米Al_2O_3-Cu复合材料  

Nanometer Al_2O_3-Cu composites with high plasticity and strength

作　　者：李美霞[1] 罗骥[1] 郭志猛[1] 方哲成[1] 姜冰[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2010年第2期230-233,255,共5页Journal of University of Science and Technology Beijing

摘　　要：以Cu-Al水雾化合金粉末为原料,通过内氧化方法制备了Al2O3弥散强化铜复合材料,使用场发射扫描电子显微镜(FE-SEM)结合X射线衍射等手段,对复合材料进行了综合研究.结果表明:γ-Al2O3弥散相粒子在基体内均匀分布,尺寸约6nm,间距30～50nm.挤压态棒材的相对导电率为87%IACS,软化温度达850℃.挤压态的25mm弥散强化铜棒材不经过任何中间热处理,直接冷拉拔得到1mm的铜丝,其抗拉强度高达680MPa.Using water-atomized Cu-Al alloy powder as raw materials,Al 2O 3 dispersion-strengthened copper composite materials were fabricated by the internal oxidation method.The obtained composite materials were comprehensively characterized by field emission scanning electron microscopy （FE-SEM） and X-ray diffraction analysis.The results show that γ-Al 2O 3 nano-particles with a mean size of 6 nm are uniformly distributed in the matrix and the space distance between particles is about 30 to 50 nm.The conductivity of the hot extruded bars is 87% IACS and the softening point is 850 ℃.Without any intermediate heat treatment,copper wires of Ф1 mm in diameter were produced by direct cold drawing from the dispersion-strengthened copper bars of Ф25 mm in diameter.The tensile strength of these copper wires is 680 MPa.

关 键 词：弥散强化铜 内氧化 塑性变形 抗拉强度 

分 类 号：TB331[一般工业技术—材料科学与工程]