Investigation on Fatigue Damage and Fracture of Al-5Zn-2Mg high strength Aluminum Alloy

摘要：

　　The tensile properties and fatigue properties were tested,and the fatigue fracture and damage behaviore of Al-5Zn-2Mg high strength aluminum alloy was investigated by means of optical microscope (OM) and scanning electron microscope (SEM).The results show that the grain of the Al-5Zn-2Mg high strength aluminum alloy is elongated after rolling deformation.The tensile strength of the Al-5Zn-2Mg aluminum alloy is 470MPa.The fatigue life is 6.4×104 cycle in R=0.1,f=99Hz,and σmax=210MPa.The average rate is 0.08μm per cycle from micro crack formed to 8mm of fatigue crack length.The fatigue crack forms in the surface.There are the fatigue striations in the fatigue crack propagation area.The crack velocity is about 2μm per cycle in propagation area.The damaged microstructure with the fatigue loading is loose,that indicates the micro cracks progressively emerge.

关键词： Al-5Zn-2Mg aluminum alloy fatigue fracture crack propagation

作者: YANG Shanglei LIN Qinlin XU Chao PAN Jiahui

作者单位: School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620,China Trechnology Center, CSR, Sifang Locomotive and Rolling Stock Co., Ltd.Qingdao 266111, China

会议类型: 国际会议

会议名称: the 2012 International Conference on Frontiers of Mechanical Engineering and Materials Engineering (机械工程与材料工程国际会议())

会议地点: 香港

会议语种:英文

页码: 1030-1033

在线出版日期: 2012-07-27（万方平台首次上网日期，不代表论文的发表时间）