超声化学原位合成纳米Al_2O_3颗粒增强铝基复合材料的微观组织与力学行为  

Microstructure and Mechanical Properties of Al_2O_3 Nano-particle Reinforced Al Composite Synthesied by Ultrasonic In-situ Reaction

作　　者：郑梦[1] 赵玉涛[1] 陈登斌[1] 张钊 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]江苏中欧材料研究院有限公司,江苏镇江212013

出　　处：《热加工工艺》2011年第18期77-80,共4页Hot Working Technology

基　　金：国家自然科学基金项目(50971066);江苏省科技支撑项目(BE2009127);江苏省"333人才工程"培养资助项目(苏教办师[2008]46号)

摘　　要：利用超声化学熔体原位反应技术合成了(Al2O3)np/Al复合材料,采用SEM与XRD对复合材料的微观组织和成分进行研究,并通过原位拉伸试验及断裂表面研究分析了该复合材料的断裂行为。结果表明:高能超声产生的局部高压能提供分散团聚纳米颗粒所需的最小压强(约17.2MPa),增强相颗粒数增多,分散较好,Al2O3颗粒在熔体中的形成机制为反应-溶解-析出;该复合材料的抗拉强度及伸长率分别达到116MPa和28.31%,较未施加高能超声作用的复合材料分别提高了52.63%和24.38%;该复合材料的室温拉伸断口表现为韧窝特征,为塑性断裂。（Al2O3）np /Al composite was synthesized by ultrasonic chemistry melt in-situ reaction.The microstructure and composition of the composite were investigated by SEM and XRD,and the fracture behavior was studied by in-situ tensile observation and fracture surface characterization.The results indicate that the high-energy ultrasonic field can afford a pressure which is approximately at least 17.2 MPa to separate the agglomeration nano-particles,with the increase of particles and more uniform distribution,and the formation mechanism of nano-size Al2O3 particle is reaction-solution-precipitation.The tensile strength and elongation reach 116MPa and 28.31%,increase by 52.63% and 24.38% than those without ultrasonic assistance,respectively.The obvious dimple-crack characters appear on the fracture surface of the composite and the fracture mechanism is plastic fracture.

关 键 词：超声化学 铝基复合材料 原位反应 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]