Room temperature creep mechanisms of Ti-6Al-4V ELI alloy with equiaxed microstructure under different applied stresses

被引:13
|
作者
Zhang, Mengmeng [1 ,2 ]
Qiu, Jianke [1 ,2 ,3 ]
Fang, Chao [1 ,2 ]
Zhang, Mingjie [1 ,2 ]
Ma, Yingjie [1 ,2 ,3 ]
Yang, Zhiqing [4 ]
Lei, Jiafeng [1 ,2 ,3 ]
Yang, Rui [1 ,2 ,3 ]
机构
[1] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
[2] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
[3] Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519000, Peoples R China
[4] Ji Hua Lab, Foshan 528200, Peoples R China
基金
中国国家自然科学基金;
关键词
Titanium alloy; Room temperature creep; Dislocation; Low angle grain boundary; Transmission electron microscope; ALPHA-TITANIUM; DEFORMATION-BEHAVIOR; GRAIN-SIZE; FATIGUE; TENSILE; PHASE; TI; PLUS; SLIP; BETA;
D O I
10.1016/j.jmrt.2023.10.001
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Titanium alloys are often used to make deep-sea pressure hulls and the creep strain produced during service is nonnegligible. The variation of dislocation structures with room temperature creep stresses in equiaxed alpha grains of Ti-6Al-4V ELI alloy was examined using transmission electron microscope. The plastic deformation mechanism varied with the applied stress, mainly manifested by the change of dislocation patterns and the sequential activation of slip systems. At the stress below the creep threshold, even though almost no macroscopic creep was generated, a small number of immobile dislocations and dislocation networks occurred in the sample. The networks were composed of dislocations with different Burgers vectors, and part of them would evolve into low angle grain boundaries (LAGBs). At the stresses above the threshold, the density of dislocations in alpha grains increased with the stress level, and the basal <a>, pyramidal <a> and <c+a> slips were activated successively which also contributed to creep and participated in the formation of LAGBs. Prismatic <a> slip was always the predominant creep deformation mechanism for the studied stress range. The activation of difficult slip systems was attributed to the stress concentration and stress redistribution between soft and hard phases/grains. In general, the amount of LAGBs increased with the applied creep stress, but the LAGBs formed by dislocation networks decreased.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
引用
收藏
页码:1579 / 1592
页数:14
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