铸造技术2025，Vol.46Issue(12)：1186-1193,8.DOI:10.16410/j.issn1000-8365.2025.5181
Ti4822钛铝合金超声疲劳尺寸效应研究
Study of the Size Effect of Ultrasonic Fatigue in Ti4822 TiAl Alloy
摘要
Abstract
The effect of the fatigue size of a Ti4822 alloy under typical service temperatures(650 ℃)was investigated through high-temperature ultrasonic fatigue experiments on three types of samples with different parallel segment diameters(2,3,and 5 mm).A method for predicting the high-temperature very high cycle fatigue(VHCF)limit of Ti4822 alloy was proposed on the basis of the highly stressed volume theory.The crack initiation mechanisms of typical fatigue samples were also analysed.The results indicate that the high-temperature VHCF limit of Ti4822 is influenced by the size effect,with the diameter of the parallel segment of the sample increasing,leading to a decrease in the VHCF limit.The proposed method for predicting the high-temperature VHCF limit of Ti4822 alloys could predict the fatigue limit within the fitting range and might be applicable for predicting the VHCF limit of Ti4822 alloys at other temperatures.The crack initiation mechanics of the Ti4822 alloy include two types:nonmetallic inclusion slip initiation and grain boundary slip initiation,and the crack initiation location moves from the surface toward the internal region as the stress decreases.关键词
钛铝合金/超声疲劳/尺寸效应/Ti4822Key words
TiAl alloy/ultrasonic fatigue/size effect/Ti4822 alloy分类
矿业与冶金引用本文复制引用
郑严,梅金娜,朱斌,蔡振..Ti4822钛铝合金超声疲劳尺寸效应研究[J].铸造技术,2025,46(12):1186-1193,8.基金项目
国家重点研发计划(2021YFB3702602) （2021YFB3702602）
江苏省卓越博士后计划(2025ZB131) （2025ZB131）
江苏省青年科技人才托举工程(JSTJ-2025-563) （JSTJ-2025-563）
