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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-Al_2O_3薄板复合材料,并用富集萃取法提取Cu-Al_2O_3复合材料中的Al_2O_3相。利用TEM分析了Cu-Al_2O_3薄板中的Al_2O_3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-Al_2O_3复合材料的析出相主要为γ-Al_2O_3,有少量的α-Al_2O_3和θ-Al_2O_3相存在。析出相Al_2O_3颗粒弥散分布在Cu基体上,且析出相γ-Al_2O_3与Cu基体完全共格;Cu-Al_2O_3薄板复合材料从表层至深约0.5 mm处,Al_2O_3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。
The Cu-Al 2 O 3 thin plate composites were prepared by internal oxidation of Cu-Al alloy sheet with 0.50 mass% Al content at 900 ℃ for 25 h. The Al 2 O 3 phase in Cu-Al 2 O 3 composite was extracted by enrichment extraction. The types and distribution of Al_2O_3 phase in Cu-Al_2O_3 sheet and the interfacial relationship with Cu matrix were analyzed by TEM. The composition of the extracted powder was studied by X-ray diffraction and TEM. The results show that the precipitated phase of Cu-Al 2 O 3 composites obtained by Cu-Al thin-plate oxidation is mainly γ-Al 2 O 3 with a small amount of α-Al 2 O 3 and θ-Al 2 O 3 phases present. Al_2O_3 particles dispersedly distributed on the Cu matrix and the precipitated phase γ-Al_2O_3 was completely coherent with the Cu matrix. The particle size of Al_2O_3 particles decreased gradually from the surface to the depth of about 0.5 mm, from 14 nm When it is reduced to 5 nm, the distance between the particles gradually increases from 10 nm to 15 nm.