Study on High Cycle Fatigue Properties of TNM-TiAl Alloy at Room Temperature

被引：0
作者：
Sun G. [1 ,2 ]
Cao R. [1 ,2 ]
Zhou X. [1 ,2 ]
Wang H. [3 ,4 ]
机构：
[1] State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou
[2] School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou
[3] Beijing CISRI-Gaona Materials Technology Co., Ltd., Beijing
[4] Beijing Key Laboratory of Advanced High Temperature Materials, Central Iron and Steel Research Institute, Beijing
来源：
Cailiao Daobao/Materials Reports | 2023年 / 37卷 / 12期
基金：
中国国家自然科学基金;
关键词：
fatigue fracture mechanism; high cycle fatigue; P-S-N curve; stress ratio; TNM-TiAl alloy;
D O I：
10.11896/cldb.21090297
中图分类号：
学科分类号：
摘要：
Tensile and compressive fatigue tests at stress ratio R = -1 and tensile fatigue tests at R = 0. 1 were carried out on TNM-TiAl alloy samples using up-and-down method and group method. The P-S-N curve of TNM-TiAl alloy was obtained and the fracture surface was analyzed. The results show that TNM-TiAl alloy is very sensitive to stress. P-S-N curve present a relatively flat oblique line at R = -1 and R = 0. 1. The fatigue limit at R = -1 and R = 0. 1 was 414. 7 MPa and 285. 6 MPa, respectively. The S-N curve at R = 0. 1 is much lower than that at R = -1. The relationship between the stress amplitude and fatigue life at R = -1 satisfies Basquin equation. The macroscopic fracture surface of fatigue specimen with rough feature is quite different from that of static-tensile specimen with flat feature. The tensile fracture surface is composed of initiation zone and propagation zone. The initiation zone is located at the corner and edge of the specimen surface or plate specimen, and composed of cleavage fracture surface at γ phase, interlamellar fracture surface at lamellar colonies and flat transgranular cleavage fracture surface at β0 phase. The fatigue fracture surface is composed of crack initiation zone, crack propagation zone, and final fast fracture zone. The fatigue fracture initiation zone includes two types of interlamellar interface cracking and γ phase cracking. The brittle fracture feature dominates the fatigue fracture, which is mainly reflected in a large number of transgranular fracture and kink tear of lamellar clusters,cleavage fracture of γ phase and transgranular fracture of β0 phase in the propagation zone. The fracture type at R = -1 is similar to that at R = 0. 1 under the same life scale, but the initiation zone and propagation zone at R = -1 are smoother. No microcracks were found in the unloaded specimens with a fatigue life of 90%, which indicates that the fatigue life is mainly determined by crack initiation. The life of crack propagation is less than 10% of the total life. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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