THE MICROSTRUCTURE AND MECHANISM OF FATIGUE CRACK INITIATION OF 2024-T3 AND 2524-T34 ALUMINUM ALLOYS

摘要：

The micro structure and mechanism of fatigue crack initiation of 2024-T3 and 2524-T34 Al alloys were investigated at the present paper.Four-point bending and tension-tension fatigue tests were conducted on the test alloys along the rolling direction at room temperature and frequency of 15Hz,R=0.1.It was found that the flat grain was elongated along the rolling direction,showing the laminar grain structure.The majority of fatigue cracks of 2524 were initiated at coarse particles,a few of them was formed on sites of material defects or slip bands.The intrusion and extrusion induced by slip band in the Al cladding layer provided principal fatigue crack initiation sites for 2024 Al-cladding aluminum alloys.

关键词： Aluminum alloy micro structure fatigue crack fatigue crack initiation

作者: T.Li Q.Y.Wang

作者单位: College of Civil Engineering and Architecture,South west Univ.of Science and Technology,Mianyang,621 Department of Engineering Mechanics,Sichuan University,Chengdu,610065,China

会议类型: 国际会议

会议名称: The Third International Conference on Heterogeneous Material Mechanics(第三届国际非均匀材料力学会议)

会议地点: 上海

会议语种:英文

页码: 929-932

在线出版日期: 2011-05-22（万方平台首次上网日期，不代表论文的发表时间）