AZ91D镁基复合材料制备及界面反应机理研究.pdfVIP

维普资讯 学兔兔 Jan．2008 铸 造 VO1．57 NO．1 FOUND只Y · 25 · 一 ^ ●^ ● 0、● — ‘ ；复合材料 } 、，■ ，’n●、■● ●v●r● ，■^，一 一 AI2O3一SiOJAZ9 1 D镁基复合材料制备及 界面反应机理研究 陈志彦，李文芳，尧建刚，彭继华 (华南理工大学机械工程学院，广东广州510640) 摘要：采用硅酸铝纤维和镁合金制备出结构紧密 A120 一SiOJAZ91D镁基复合材料。介绍了复合材料的制备工艺，适 宜的挤压铸造工艺为预制体温度650℃、模具温度550℃、浇注温度760℃和30～50 MPa压力。XRD、SEM、EDS和光学 金相显微镜OM等分析结果表明，复合材料主要由Mg、B—Mg。7Al。2、MgO、A1PO 、3A12032SiO2和Mg2si等结晶相组成； 镁与硅酸铝纤维反应生成MgO和汉字状Mg2Si产物；基体镁与硅酸铝纤维的界面形成较紧密的结合层。 关键词：A120 一SiO：／AZ9 1 D镁基复合材料；硅酸铝纤维；反应机理；XRD分析 中图分类号：TG146．22 文献标识码：A 文章编号：1001—4977(2008)01—00025—04 Preparation and l nte ce Reaction Mechanism of AI2O-SiO2／AZ91 D Magnesium Matrix Composites CHEN Zhi-yan，LI Wen-fang，YAO Jian-gang，PENG Ji-hua (School of Mechanical Engineering，South China University of Technology，Guangzhou 51 0640， Guangdong，China) Abstract： AI2O3-SiOJAZ91 D magnesium matrix composites with compacted structure were prepared with aluminum silicate fibers and AZ91 D magnesium alloy by squeeze casting method． The preparation technique of the composites is presented，and the optimum technique of squeeze casting，that is，perform temperature 650℃，mould temperature 550℃，pouring temperature 760℃ and pressure 30-50 MPa，were given．The results of XRD，SEM，OM and EDS showed that the composites are mostly composed of crystal phases as Mg，13-MglTAI12，MgO，AIPO4，3AI2Oa‘2SIO2 and Mg2Si，and SO on．MgO and Chinese script type Mg2Si are produced by the reaction between magnesium and aluminium silicate fiber