B_4C/2009Al复合材料的高周疲劳性能研究及安全性分析  

Research and Safety Analysis of High Cycle Fatigue Behavior of Boron Carbide Reinforced 2009 Aluminum Matrix Composites

作　　者：高嵩[1] 王茂廷[1] GAO Song WANG Mao-ting(School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China)

机构地区：[1]辽宁石油化工大学机械工程学院,辽宁抚顺113001

出　　处：《合成材料老化与应用》2016年第6期46-51,共6页Synthetic Materials Aging and Application

摘　　要：金相观察表明,形貌不规则的B_4C颗粒随机分布在2009Al基体中,分布比较均匀,颗粒尺寸大约为7μm。利用透射电子显微镜对复合材料的微观形貌进行观察发现,大部分B_4C颗粒和2009Al基体的界面平直、干净,只有在少数颗粒的尖角处发现Al_3BC的产生,这表明B_4C/2009Al系统比较稳定,界面结合良好。复合材料的屈服强度和抗拉强度都有了显著的提高,结合拉伸断口分析可知B_4C颗粒断裂是复合材料拉伸失效的主要原因,此外还发现有少量界面脱粘现象。The metallographic observations revealed that the irregular shaped B4 C particles in sizes of about 7μm were distributed in the 2009Al matrix randomly and uniformly. In addition,the microstructures of composite were observed by transmission electron microscope. Most of the interfaces between B4 C particles and 2009Al matrix were very clean and straight,though a few of Al3 BC could be found nearby the sharp corner of B4 C particles. It was indi-cated that the B4 C/2009Al system was stable relatively and the interfacial bonding was good. And,the improved yield and tensile strength of the composites were consistent with the previous conclusion. Further,the fractograph analyses revealed that the tensile failure was attributed to the fracture of B4 C particles primarily though a few of in-terfacial decohesion could be found.

关 键 词：B4C颗粒 疲劳断口 裂纹扩展 疲劳裂纹萌生 

分 类 号：TB331[一般工业技术—材料科学与工程]