The Influence of Air Humidity on Fatigue Properties of an AA2524—T34 Aluminum Alloy

摘要：

Self-aligning four-point bend fatigue tests were conducted to investigate the influence of humid air on the fatigue behavior of an AA2524-T34 Al alloy. Test specimens of the alloy along the rolling direction was cycled at room temperature and frequency of 15 Hz, tension-tension loading(R = 0.1), in 15％ relative humidity (RH) and 95％ RH up to 107 cycles to failure. The S-N data shows continuous reduction tendency. It was found that with the increase of test relative humidity, the fatigue properties of the alloy is decreased, the fatigue limit in 95％ RH was nearly 20％ reduction of that in 15％ RH, only 67％ of its yield strength. Meanwhile, the S-N data is much more scattered than it in lower relative humidity. In 155％ and 95％ RH, cracks were initiated predominantly at coarse particles but partly at grain boundaries on the surface in 95％RH. SEM results show the characteristics of intergranular fracture in high humidity circumstance.

关键词： AA2524 Al alloy four-point bend fatigue fatigue properties fatigue crack initiation relative humidity (RH)

作者: Tang Li Junlin Tao Qingyuan Wang

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

会议类型: 国际会议

会议名称: 2011 International Conference on Advanced Material Research(ICAMR 2011)(2011年先进材料研究国际会议)

会议地点: 重庆

会议语种:英文

页码: 311-314

在线出版日期: 2011-01-21（万方平台首次上网日期，不代表论文的发表时间）