【作者】 赵敬忠； 常金晶； 岳建设； 张发建；

【Author】 ZHAO Jingzhong~1 CHANG Jinjing~1 YUE Jianshe~1 ZHANG Fajian~2 (1.School of Material Science and Engineering,Xi’an University of Technology,Xi’an 710048; 2.Virginia Polytechnic Institute & State University,Blacksburg,VA 24061-0356,USA)

【机构】 西安理工大学材料科学与工程学院； Virginia 州立大学；

【摘要】 采用 Lanxide 技术制备了 Al₂O₃/Al 复合材料,通过中断生长实验方法,和热重分析、光学显微镜、X 射线衍射、场发射扫描电镜等检测,对复合材料表面形态和内部组织结构的演变进行了观察,探讨了 Al-Si-Zn 合金在1100℃条件下的自由氧化生长过程。结果表明：熔融 Al-Si-Zn 合金氧化生长经历了孕育期、快速生长期和饱和生长期3个阶段。在各阶段中,样品的组织形貌均发生了明显变化：Al₂O_/Al 复合材料在宏观上为典型的胞状生长方式,微观上是由三维连通的α-Al₂O₃相构成骨架,其间分布着残余 Al-Si 相和孔洞。更多还原

【Abstract】 An Al₂O₃/Al composite was prepared by the Lanxide technique.The uncontrolled oxidation growth process of Al-Si-Zn alloy at 1 100℃ was studied,and its macrostructure and microstructure evolution were investigated by thermogravimetric analysis, interrupting growth,optical microscopy,X-ray diffraction and field-scanning electron microscopy.The results show that there are three stages during the directed melt oxidation of AI-Si-Zn alloy:the incubation period,rapid oxidation growth period and saturating growth period.The structure changes obviously in every period.The Al₂O₃/Al composite grows in the way of cellular macrostructure, and the microstructure is composed of a three-dimensional continuous α-Al₂O₃ framework structure and the remnant AI-Si and holes are distributed throughout the structure.更多还原