文献类型：期刊文献

英文题名：Influence of multilevel lamellar microstructure on notch high cycle fatigue properties and crack initiation behavior of Ti-55531 alloy

作者：Zhao, Yanyan Zhang, Zhong Huang, Chaowen Yang, Jiang Tan, Changsheng Wan, Mingpan Zhao, Yongqing

第一作者：Zhao, Yanyan

通信作者：Huang, CW[1];Tan, CS[2]

机构：[1]Guizhou Univ, Natl & Local Joint Engn Lab High Performance Met S, Guiyang 550025, Peoples R China;[2]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;[3]Xi Univ Technol, Sch Mat Sci & Engn, Xian 710048, Peoples R China;[4]Northwest Inst Nonferrous Met Res, Xian 710016, Peoples R China

第一机构：Guizhou Univ, Natl & Local Joint Engn Lab High Performance Met S, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Guiyang 550025, Peoples R China;corresponding author), Xi An Jiao Tong Univ, Xian 710048, Peoples R China.

年份：2025

卷号：1010

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20244817424485);Scopus(收录号：2-s2.0-85209947347);WOS:【SCI-EXPANDED(收录号:WOS:001367418200001)】；

基金：This work was supported by the National Natural Science Foundation of China (Nos. 52061005 and 52261025) , the Science and Technology Programs of Guizhou Province (Nos. YQK [2023] 009, CXTD [2023] 009, and GCC [2023] 098) , the Technology Innovation Leading Program of Shaanxi province (No. 2024ZCYYDP92) . The authors would like to thank Dr. Xuehao Zheng from ZKKF (Beijing) Science & Technology Company for supporting of TEM analysis.

语种：英文

外文关键词：Ti-55531 alloy; Notch high cycle fatigue; Fatigue microcracks initiation; Multilevel lamellar microstructure

摘要：The mechanism of microcrack initiation for notch high cycle fatigue (NHCF) in Ti-55531 alloy with various multilevel lamellar microstructures (MLMs) under the certain notch root radius (R=0.34 mm) was thoroughly investigated. Results indicate that the primary microstructure unit controlling fatigue crack initiation is the secondary alpha (alpha s) lamellae. Majority of microvoids and microcracks initiate at the interfaces between alpha s and residual (3 matrix ((3r) nearby the notch root, propagating towards the specimen core along alpha s/(3r interfaces or passing through alpha s lamellae, forming longer microcracks. Moreover, as the width/length ratio of alpha s lamella and alpha colony (d alpha and dc) increases, the cyclic plastic deformation of alpha s lamella and alpha colony intensify significantly. Consequently, numerous fractures occurred in alpha s lamellae, greatly facilitating fatigue microcracks initiation and leading to a severe reduction in both fatigue life and strength of the Ti-55531 alloy. Besides slipping and twinning, a small number of stacking faults (SFs) were also detected in the alpha s lamellae at smaller microstrutural size (d alpha=0.049 and 0.053, dc=0.148 and 0.168). Interestingly, the interaction between twins, basal SFs, and dislocation slip could be another significant mechanism that promotes the cracking of alpha s/(3r interfaces for NHCF microcrack initiation in this alloy. Furthermore, with an increasing of d alpha and dc, the occurrence of slipping increases, while the occurrences of twins and SFs decrease.