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孙洋洋,常辉,方志刚,王莹,董月成,郭艳华,周廉.TC4 ELI钛合金显微组织对低周疲劳性能的影响[J].稀有金属材料与工程(英文),2020,49(5):1623~1628.[Sun Yangyang,Chang Hui,Fang Zhigang,Wang Ying,Dong Yuecheng,Guo Yanhua and Zhou Lian.Effect of Microstructure on Low Cycle Fatigue Properties of TC4 ELI Titanium Alloy[J].Rare Metal Materials and Engineering,2020,49(5):1623~1628.]
Effect of Microstructure on Low Cycle Fatigue Properties of TC4 ELI Titanium Alloy
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Received:January 29, 2019  Revised:April 06, 2019
DOI:
Key words: titanium alloy  microstructure  low cycle fatigue  fracture morphology
Foundation item:海洋装备用金属材料及其应用国家重点实验室开放基金(项目号SKLMEA-K201807);中国博士后科学基金(项目号2017M623392);江苏省研究生科研与实践创新计划项目(KYCX17_0984);江苏高校优势学科建设工程资助项目(PAPD)
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Sun Yangyang,Chang Hui,Fang Zhigang,Wang Ying,Dong Yuecheng,Guo Yanhua and Zhou Lian  
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Abstract:
      Low cycle fatigue behavior of TC4 ELI titanium alloy with bimodal and lamellar microstructure had been investigated by analyzation of strain-cycles curve with different stress amplitudes. Results indicated that the volume fraction of equiaxed α phase is about ~ 26.6% for the bimodal microstructure, the average grain size is approximate 7.8 μm. At the same time, the thickness of α phase layer is about 0.5 ~ 2.0 μm for lamellar microstructure. Cyclic softening phenomenon was observed for all the samples of TC4 ELI alloys with different microstructure at the maximum stress. Sample with bimodal microstructure exhibited higher low cycle fatigue life, which could be attributed to the shorter effective slip path than the one with lamellar microstructure. More than that, the presence of equiaxed α-phase with high dislocation density also could hinder the initiation and propagation of fatigue cracks for the bimodal microstructure. Fracture morphology shown flat and smooth for the sample with bimodal microstructure, however, some geometric facets associated with the original coarse-grained β were found for the sample with lamellar microstructure.