Microstructural insights into the influence of stress amplitudes on the crack nucleation mechanism of Ti–2Al-2.5Zr alloy using quasi in-situ tests
The fatigue cracking mechanism of Ti–2Al-2.5Zr alloy was investigated under different stress amplitudes. The evolution of fatigue damage was analyzed using quasi in-situ tests. The dependence of transgranular and intergranular crack nucleation on microstructure features was discussed in detail. The...
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425000274 |
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| author | Shengkun Wang Mengqi Li Zuoliang Ning Gang Chen Zheng Liu Jun Wu Wenchun Jiang |
| author_facet | Shengkun Wang Mengqi Li Zuoliang Ning Gang Chen Zheng Liu Jun Wu Wenchun Jiang |
| author_sort | Shengkun Wang |
| collection | DOAJ |
| description | The fatigue cracking mechanism of Ti–2Al-2.5Zr alloy was investigated under different stress amplitudes. The evolution of fatigue damage was analyzed using quasi in-situ tests. The dependence of transgranular and intergranular crack nucleation on microstructure features was discussed in detail. The mechanisms of slip-induced and twinning-detwinning (T-D) induced crack nucleation were elucidated, respectively. It was found that, at the stress amplitude of 442 MPa, the slip damage, in the form of intrusions/extrusions, dominated crack nucleation. Transgranular cracks primarily nucleate along the prismatic planes of the variants with highest Schmid Factor of prismatic slip (SFpris.); intergranular cracks are mainly induced at grain boundaries (GBs) by slip impacting/shearing GB behaviors and at GB triple junctions due to strain incompatibility. As the stress amplitude increased to 475 MPa, the dominant crack mode transitioned from slip-dominant cracks to T-D induced cracks and intergranular cracks due to the competition between the T-D and slip behavior. Twin boundaries (TBs), GBs, slip planes adjacent to the activated T-D regions, and the twin pairs/chains in adjacent grains were identified as preferred sites for crack nucleation. |
| format | Article |
| id | doaj-art-a76152a23a1342d2971faf922fd3025c |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-a76152a23a1342d2971faf922fd3025c2025-01-19T06:26:04ZengElsevierJournal of Materials Research and Technology2238-78542025-03-013511781209Microstructural insights into the influence of stress amplitudes on the crack nucleation mechanism of Ti–2Al-2.5Zr alloy using quasi in-situ testsShengkun Wang0Mengqi Li1Zuoliang Ning2Gang Chen3Zheng Liu4Jun Wu5Wenchun Jiang6College of New Energy, China University of Petroleum (East China), Qingdao 266580, ChinaSchool of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, ChinaSchool of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, ChinaSchool of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China; Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, Tianjin 300350, China; State Key Laboratory of Chemical Engineering (Tianjin University), Tianjin 300350, China; Corresponding author. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China; Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, Tianjin 300350, China; State Key Laboratory of Chemical Engineering (Tianjin University), Tianjin 300350, ChinaNuclear Power Institute of China, Chengdu, Sichuan 610015, ChinaCollege of New Energy, China University of Petroleum (East China), Qingdao 266580, China; Corresponding author.The fatigue cracking mechanism of Ti–2Al-2.5Zr alloy was investigated under different stress amplitudes. The evolution of fatigue damage was analyzed using quasi in-situ tests. The dependence of transgranular and intergranular crack nucleation on microstructure features was discussed in detail. The mechanisms of slip-induced and twinning-detwinning (T-D) induced crack nucleation were elucidated, respectively. It was found that, at the stress amplitude of 442 MPa, the slip damage, in the form of intrusions/extrusions, dominated crack nucleation. Transgranular cracks primarily nucleate along the prismatic planes of the variants with highest Schmid Factor of prismatic slip (SFpris.); intergranular cracks are mainly induced at grain boundaries (GBs) by slip impacting/shearing GB behaviors and at GB triple junctions due to strain incompatibility. As the stress amplitude increased to 475 MPa, the dominant crack mode transitioned from slip-dominant cracks to T-D induced cracks and intergranular cracks due to the competition between the T-D and slip behavior. Twin boundaries (TBs), GBs, slip planes adjacent to the activated T-D regions, and the twin pairs/chains in adjacent grains were identified as preferred sites for crack nucleation.http://www.sciencedirect.com/science/article/pii/S2238785425000274Ti–2Al-2.5Zr alloyQuasi in-situ testsFatigue crack nucleationSlip impacting/shearing GB behaviorTwin-detwinning behaviorStrain compatibility |
| spellingShingle | Shengkun Wang Mengqi Li Zuoliang Ning Gang Chen Zheng Liu Jun Wu Wenchun Jiang Microstructural insights into the influence of stress amplitudes on the crack nucleation mechanism of Ti–2Al-2.5Zr alloy using quasi in-situ tests Journal of Materials Research and Technology Ti–2Al-2.5Zr alloy Quasi in-situ tests Fatigue crack nucleation Slip impacting/shearing GB behavior Twin-detwinning behavior Strain compatibility |
| title | Microstructural insights into the influence of stress amplitudes on the crack nucleation mechanism of Ti–2Al-2.5Zr alloy using quasi in-situ tests |
| title_full | Microstructural insights into the influence of stress amplitudes on the crack nucleation mechanism of Ti–2Al-2.5Zr alloy using quasi in-situ tests |
| title_fullStr | Microstructural insights into the influence of stress amplitudes on the crack nucleation mechanism of Ti–2Al-2.5Zr alloy using quasi in-situ tests |
| title_full_unstemmed | Microstructural insights into the influence of stress amplitudes on the crack nucleation mechanism of Ti–2Al-2.5Zr alloy using quasi in-situ tests |
| title_short | Microstructural insights into the influence of stress amplitudes on the crack nucleation mechanism of Ti–2Al-2.5Zr alloy using quasi in-situ tests |
| title_sort | microstructural insights into the influence of stress amplitudes on the crack nucleation mechanism of ti 2al 2 5zr alloy using quasi in situ tests |
| topic | Ti–2Al-2.5Zr alloy Quasi in-situ tests Fatigue crack nucleation Slip impacting/shearing GB behavior Twin-detwinning behavior Strain compatibility |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425000274 |
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