Stress-induced phase transformation and phase boundary sliding in Ti: An atomically resolved in-situ analysis

被引:5
|
作者
Kou, Zongde [1 ]
Li, Xuteng [1 ]
Huang, Rong [1 ]
Yang, Lixia [2 ]
Yang, Yanqing [3 ]
Feng, Tao [1 ]
Lan, Si [1 ]
Wilde, Gerhard [1 ,4 ]
Lai, Qingquan [5 ]
Tang, Song [1 ]
机构
[1] Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Peoples R China
[3] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[4] Univ Munster, Inst Mat Phys, Wilhelm Klemm St 10, D-48149 Munster, Germany
[5] Nanjing Tech Univ, Key Lab Light weight Mat, Nanjing 210009, Peoples R China
基金
国家重点研发计划; 中国博士后科学基金; 中国国家自然科学基金;
关键词
In situ HRTEM; Hcp-to-fcc transformation; Pure Ti; Phase boundary sliding; Molecular dynamics simulation; CENTERED-CUBIC TITANIUM; LATTICE REORIENTATION; ELECTRON-MICROSCOPE; MOLECULAR-DYNAMICS; PURE TITANIUM; CRACK-TIP; DEFORMATION; TRANSITION; MECHANISM; BEHAVIOR;
D O I
10.1016/j.jmst.2022.12.029
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In-situ tensile experiments on pure Ti were performed in a transmission electron microscope at room temperature. The dynamic process of stress-induced hexagonal closed-packed (hcp) to face-centered cu-bic (fcc) structural transformation ahead of a crack tip was captured at the atomic level. Intriguingly, a sliding behavior of the ensuing (0 0 01)hcp/(11 over line 1 )fcc phase boundary was observed to further accommodate the plastic deformation until crack initiation. The sliding was accomplished via the successive conserva-tive glide of extended dislocations along the (0 0 01)hcp/(11 over line 1 )fcc phase boundary. A molecular dynamics simulation was carried out to corroborate the experiments and the results confirm the new dislocation -mediated sliding mechanism.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码:30 / 36
页数:7
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