Preparation and microstructure of in-situ(ZrB_2+Al_2O_3+Al_3Zr)_p/A356 composite synthesized by melt direct reaction  

(ZrB_2+Al_2O_3+Al_3Zr)_p/A356复合材料的原位直接反应法制备及微观组织(英文)

作　　者：杨华静[1] 赵玉涛[1] 张刚[1] 张松利[1] 陈登斌[1] 

机构地区：[1]江苏大学材料科学与工程学院,镇江212013

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第3期571-576,共6页中国有色金属学报（英文版）

基　　金：Project(50971066) supported by the National Natural Science Foundation of China;Project(20070299004) supported by Research Fund for the Doctoral Program of Higher Education of China;Project(2008-46) supported by Jiangsu Provincial '333' Project of training the High-level Talents Foundation,China;Project(BE2009127) supported by Jiangsu Provincial Science Supporting Item,China

摘　　要：（ZrB2＋Al2O3＋Al3Zr）/A356 composites were synthesized by melt direct reaction from A356-（K2ZrF6＋KBF4＋Na2B4O7） system.The phase compositions and the microstructures of the as-prepared composites were investigated by XRD,SEM and TEM.The results show that the reinforcements are composed of ZrB2 and Al2O3 ceramic phase particles and Al3Zr intermetallic particles.The ZrB2 particulates are easy to join together to form some particle clusters and distribute along the α（Al） grain boundary.The morphologies of the ZrB2 particulates are in hexagon-shape with the size of about 50 nm.The TEM investigation results of Al3Zr indicate that Al3Zr grows in the form of facet with the length-diameter ratio of about 20.The morphologies of Al2O3 particles are in rectangular-shape and ellipsoidal-shape,with the size of about 0.1 μm.In addition,the interfaces of the matrix and particles are net and no interfacial outgrowth is observed.采用A356-(K2ZrF6+KBF4+Na2B4O7)作为熔体直接反应体系制备(ZrB2+Al2O3+Al3Zr)/A356复合材料。利用XRD、SEM和TEM等测试技术研究复合材料的相组成和微观组织。结果表明,复合材料增强相由ZrB2和Al2O3陶瓷相颗粒和Al3Zr金属间化合物相颗粒组成。ZrB2颗粒易团聚形成颗粒团簇并沿α(Al)合金晶界分布;ZrB2颗粒的微观形貌为六边形,尺寸在50nm左右。TEM研究发现,Al3Zr颗粒以小面形式生长,其长径比约为20;Al2O3颗粒形貌为长方体状和椭圆状,尺寸约为0.1μm。此外,基体与颗粒的相界面干净,无界面反应物生成。

关 键 词：aluminum matrix composites melt direct reaction in situ particle MICROSTRUCTURE 

分 类 号：TB331[一般工业技术—材料科学与工程]