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利用内氧化法制备出Al2O3弥散强化铜复合材料,通过场发射扫描电子显微镜(FE-SEM)结合X射线衍射等手段,对材料组织结构和性能进行了研究。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(φ25mm)经99.8%变形量冷拉拔后,呈现均匀、连续的纤维组织,纤维长宽比大于20,抗拉强度达680MPa;挤压态棒材的电导率87%IACS,软化温度850℃。
The Al2O3 dispersion-strengthened copper composites were prepared by internal oxidation method. The structure and properties of the materials were studied by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction. The results show that the γ-Al2O3 dispersed phase particles are uniformly distributed in the matrix with a size of about 6nm and a pitch of 30-50nm. After being extruded by a 99.8% deformation amount of the extruded rod (φ25mm), uniform and continuous fibrous tissue is present, Fiber aspect ratio greater than 20, the tensile strength of 680MPa; extruded bar conductivity 87% IACS, the softening temperature of 850 ℃.