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Evolution of Dislocation Structure During Room Temperature Compressive Creep of a New α + β Titanium Alloy.

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Title: Evolution of Dislocation Structure During Room Temperature Compressive Creep of a New α + β Titanium Alloy.
Authors: Zhang, Mengmeng1,2 (AUTHOR), Qiu, Jianke1,2 (AUTHOR) jkqiu@imr.ac.cn, Hu, Xiaobing3 (AUTHOR) xbhu@northwestern.edu, Fang, Chao1,2 (AUTHOR), Zhang, Mingjie1,2 (AUTHOR), Ma, Yingjie1,2 (AUTHOR), Lei, Jiafeng1,2 (AUTHOR), Yang, Rui1,2 (AUTHOR) ryang@imr.ac.cn
Source: Metallurgical & Materials Transactions. Part A. Feb2025, Vol. 56 Issue 2, p557-570. 14p.
Subjects: Creep (Materials), Dislocation structure, Screw dislocations, Transmission electron microscopy, Service design
Abstract: A precise understanding of cold compressive creep behavior is essential for elucidating the failure mechanisms of titanium pressure hulls in deep-sea service and designing enhanced alloys with optimized performance. In this study, we systematically investigated room temperature compressive creep mechanisms in an α + β titanium alloy featuring a multi-level lamellar microstructure under varying applied stresses, using transmission electron microscopy (TEM) analysis. At an applied stress of 0.75σ0.2, the alloy exhibits minimal plastic strain accumulation, with most dislocations remaining immobile. Once the stress threshold is exceeded, planar slip initiates along the prismatic plane, followed by the activation of basal and pyramidal slip at higher stress levels. Under high stress (0.95σ0.2), creep deformation is primarily governed by prismatic and basal slip. Slip transfer between similar oriented grains within a microtextured region frequently occurs at stresses above 0.83σ0.2. Additionally, we observed that higher applied stresses suppress the cross-slip of prismatic screw dislocations within the α grains. [ABSTRACT FROM AUTHOR]
Copyright of Metallurgical & Materials Transactions. Part A is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Evolution of Dislocation Structure During Room Temperature Compressive Creep of a New α + β Titanium Alloy.
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  Data: <searchLink fieldCode="JN" term="%22Metallurgical+%26+Materials+Transactions%2E+Part+A%22">Metallurgical & Materials Transactions. Part A</searchLink>. Feb2025, Vol. 56 Issue 2, p557-570. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Creep+%28Materials%29%22">Creep (Materials)</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocation+structure%22">Dislocation structure</searchLink><br /><searchLink fieldCode="DE" term="%22Screw+dislocations%22">Screw dislocations</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Service+design%22">Service design</searchLink>
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  Data: A precise understanding of cold compressive creep behavior is essential for elucidating the failure mechanisms of titanium pressure hulls in deep-sea service and designing enhanced alloys with optimized performance. In this study, we systematically investigated room temperature compressive creep mechanisms in an α + β titanium alloy featuring a multi-level lamellar microstructure under varying applied stresses, using transmission electron microscopy (TEM) analysis. At an applied stress of 0.75σ0.2, the alloy exhibits minimal plastic strain accumulation, with most dislocations remaining immobile. Once the stress threshold is exceeded, planar slip initiates along the prismatic plane, followed by the activation of basal and pyramidal slip at higher stress levels. Under high stress (0.95σ0.2), creep deformation is primarily governed by prismatic and basal slip. Slip transfer between similar oriented grains within a microtextured region frequently occurs at stresses above 0.83σ0.2. Additionally, we observed that higher applied stresses suppress the cross-slip of prismatic screw <a> dislocations within the α grains. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Metallurgical & Materials Transactions. Part A is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s11661-024-07665-5
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      – SubjectFull: Dislocation structure
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      – SubjectFull: Screw dislocations
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      – TitleFull: Evolution of Dislocation Structure During Room Temperature Compressive Creep of a New α + β Titanium Alloy.
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              Text: Feb2025
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