Cu-Al合金薄板内氧化析出相Al2O3晶型及分布

Al2O3 crystal type and distribution of internal oxidized Cu-Al alloy sheet

摘要:

Al含量为0.50 wt.%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γ-Al₂O₃,有少量的α-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γ-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。

Abstract:

Cu-Al₂O₃ composite sheets were prepared by the internal oxidation of Cu-0.50 wt.%Al alloy sheets at 900 ℃ for 25 hours. 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 theSprecipitated phases of Cu-Al₂O₃ composites by the internal oxidation of Cu-Al alloy sheets are mainly γ-Al₂O₃, and a few of α-Al₂O₃ and θ-Al₂O₃ were precipitated. The Al₂O₃ particles wereSdistributedSin theSCu matrix and completely coherent with the Cu matrix. From the surface to the deep of 0.5 mm,the size of Al₂O₃ particles is reduced from 14 to 5 nm and the spacing of Al₂O₃ particles is reduced from 10 to 15 nm.