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Creep strain and stress state-dependent creep asymmetry during early-stage room-temperature creep in a titanium alloy

文献类型：期刊论文

作者Guo YY(郭艺云)1,3; Zhang, Bowen2; Zhou LL(周玲玲)1; Li JH(李江华)1
刊名JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
出版日期2026-02-01
卷号243页码:1-14
关键词TC4 ELI alloy Creep Stress state Microstructure Dislocation slip
ISSN号1005-0302
DOI10.1016/j.jmst.2025.03.092
通讯作者Li, Jianghua(lijianghua@imech.ac.cn)
英文摘要Room-temperature (RT) creep may happen below yield stress in titanium alloys, while the creep asymmetry remains pending under various stress states. The creep behavior and plastic damage were investigated during the early-stage RT-creep up to 60 h in a titanium alloy. The investigated TC4 ELI Ti-alloy is a high-purity ("Extra-Low-Interstitial") version of Ti-6Al-4V with a near- alpha type microstructure after thermomechanical treatment. Three kinds of creep testing were conducted, including axial tension, compression, and torsion, respectively. The microstructure and especially, dislocation behaviors were analyzed in detail by using electron backscattered diffraction, transmission electron microscopy, and X-ray diffraction after an interrupted and terminated creep testing. The creep strain differs, which is 5 %, 1 %, and 0.5 % under tension, compression, and torsion, respectively. It undoubtedly indicates the presence of creep asymmetry. To clarify the creep mechanism, the slip system was then analyzed. It is shown that the prismatic slip is dominant during tensile creep, while the pyramidal slip appears most during compressive creep. The limited slip transmission and immobile dislocations result in lower creep strain. The reason behind the creep asymmetry is attributed to the stress state, producing the activation of various slip systems, along with the evolution of true stress. Finally, the mechanistic origins are also discussed as to the distinctive creep rate under various stress states. (c) 2025 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
分类号一类
WOS关键词TENSION-COMPRESSION ASYMMETRY ; MICROSTRUCTURE ; TI-6AL-4V ; MECHANISM ; METALS ; DAMAGE ; ALPHA ; SLIP
资助项目National Natural Science Foundation of China[12202444] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB0620303]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:001566320900001
资助机构National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences
其他责任者李江华
源URL[http://dspace.imech.ac.cn/handle/311007/103575]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
2.China Ship Sci Res Ctr, Wuxi 214082, Peoples R China
3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China;
推荐引用方式
GB/T 7714		 Guo YY,Zhang, Bowen,Zhou LL,et al. Creep strain and stress state-dependent creep asymmetry during early-stage room-temperature creep in a titanium alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2026,243:1-14.
APA 郭艺云,Zhang, Bowen,周玲玲,&李江华.(2026).Creep strain and stress state-dependent creep asymmetry during early-stage room-temperature creep in a titanium alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,243,1-14.
MLA 郭艺云,et al."Creep strain and stress state-dependent creep asymmetry during early-stage room-temperature creep in a titanium alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 243(2026):1-14.

入库方式： OAI收割

来源：力学研究所

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