文献类型：期刊文献

英文题名：Effect of multilevel lamellar microstructures on notch high cycle fatigue damage micromechanism of TC21 alloy

作者：Li, Xiang Huang, Chaowen Yang, Jiang Liu, Dan Li, Tianxin Tan, Changsheng Jia, Weiju Wan, Mingpan

第一作者：Li, Xiang

通信作者：Huang, CW[1];Tan, CS[2];Jia, WJ[3]

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]Xian 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, Natl & Local Joint Engn Lab High Performance Met S, Guiyang 550025, Peoples R China;corresponding author), Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Peoples R China;corresponding author), Northwest Inst Nonferrous Met Res, Xian 710016, Peoples R China.

年份：2025

卷号：199

外文期刊名：INTERNATIONAL JOURNAL OF FATIGUE

收录：;EI(收录号：20251918380314);Scopus(收录号：2-s2.0-105004362992);WOS:【SCI-EXPANDED(收录号:WOS:001490012400003)】；

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 and CXTD[2023]009) , the Technology Innovation Leading Program of Shaanxi Province

语种：英文

外文关键词：TC21 alloy; Multilevel lamellar microstructure; Notch high cycle fatigue; Fatigue microcrack initiation mechanism

摘要：Effect of multilevel lamellar microstructures (MLMs) on notch high cycle fatigue (NHCF) property and micro-crack initiation behavior of TC21 alloy were systematically investigated. The MLMs was created via a triple heat treatment, including parallel-aligned alpha laths (alpha lath) within the alpha colony (alpha c) and aged alpha fine lamellae (alpha fine) in the beta transformation matrix (beta trans). Results indicate that microstructural refinement and an increase in heterogeneous regions adversely affect NHCF properties. Most microcracks initiate within slip and shear deformation bands located in heterogeneous areas, which act as fatal sites for fatigue damage. The activation of early {0002}alpha basal slip and subsequent formation of {1102}alpha pyramidal slip are main driver that contribute to the initiation of microvoids and microcracks within the alpha phase. Localized uneven deformation is a prerequisite for the activation of basal slip. Moreover, under higher cyclic stress and lower alpha 2 nanoparticles content, both basal slip and pyramidal slip coexist within the alpha lath, resulting in the formation of cross persistent slip bands (PSBs) and localized hardening. This process further facilitates the initiation of microvoids and microcracks within the alpha lath. Crucially, the initial slip of dislocations and their interactions with interfaces also contribute to microvoids formation.