Al含量为0.50％(质量分数)的Cu-Al合金薄板在900℃下内氧化25 h制备Cu-Al2O3薄板复合材料,并用富集萃取法提取Cu-Al2O3复合材料中的Al2O3相.利用TEM分析了Cu-Al2O3薄板中的Al2O3相的种类、分布、与Cu基体的界面关系,用X射线衍射和TEM研究了萃取粉末的组成.结果表明,Cu-Al薄板内氧化法所得的Cu-Al2O3复合材料的析出相主要为y-Al2O3,有少量的a-Al2O3和θ-Al2O3相存在.析出相Al2O3颗粒弥散分布在Cu基体上,且析出相y-Al2O3与Cu基体完全共格;Cu-Al2O3薄板复合材料从表层至深约0.5 mm处,Al2O3颗粒粒径逐渐减小,从14 nm减小到5 nm,颗粒间距逐渐增大,从10 nm增加到15 nm.
Cu-Al2O3 composite sheets were prepared by the internal oxidation of Cu-0.50 wt％Al alloy sheets at 900 ℃ for 25 h.An enrichment extraction method was used to extract Al2O3 phase in Cu-Al2O3 composites.The type,distribution,relationship with the Cu substrate interface of Al2O3 phase in the Cu-Al2O3 sheets were studied by TEM.The extracted powder was studied by X-ray diffraction (XRD) and TEM.The results show that the precipitated phases of Cu-Al2O3 composites by the internal oxidation of Cu-Al alloy sheets are mainly γ-Al2O3,as well as a few α-Al2O3 and θ-Al2O3.The Al2O3 particles are distributed in the Cu matrix and completely coherent with the Cu matrix.From the surface to the depth of 0.5 mm,the size of Al2O3 particles is reduced from 14 nm to 5 nm while the spacing of Al2O3 particles is increased from 10 nm to 15 nm.
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