超声化学原位合成纳米Al2O3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 Al2O3 Nano-particle Reinforced Al Composite Synthesied by Ultrasonic In-situ Reaction
郑 梦1, 赵玉涛1, 陈登斌1, 张 钊2
点击：3806次 下载：0次
作者单位：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
中文关键字：超声化学； 铝基复合材料； 原位反应； 力学性能
英文关键字：ultrasonic chemistry; aluminum matrix composite; in-situ reaction; mechanical properties
中文摘要：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17.2 MPa)，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116 MPa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。
英文摘要：(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.