Achieving enhanced strength-ductility synergy in heterogeneous equiaxed structured Ti-6Al-4V alloy sheets by cryogenic pre-stretching
Achieving excellent strength-ductility balance in commercial titanium alloys has been recognized as a challenging task. In this study, we designed a heterogeneous equiaxed structure in Ti-6Al-4V alloy via cryogenic pre-stretching at liquid nitrogen temperature. The results show that 7.1% cryogenic p...
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Elsevier
2025-01-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127524009389 |
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| author | Lingjian Meng Zhuoya Zhao Peng Lin Zhengyi Jiang Jingwei Zhao |
| author_facet | Lingjian Meng Zhuoya Zhao Peng Lin Zhengyi Jiang Jingwei Zhao |
| author_sort | Lingjian Meng |
| collection | DOAJ |
| description | Achieving excellent strength-ductility balance in commercial titanium alloys has been recognized as a challenging task. In this study, we designed a heterogeneous equiaxed structure in Ti-6Al-4V alloy via cryogenic pre-stretching at liquid nitrogen temperature. The results show that 7.1% cryogenic pre-stretching of the alloy induces an increased yield/tensile strength of 952 MPa/1005 MPa and maintains a high elongation of 16.1% compared with the as-received alloy (840 MPa/930 MPa and 16.3%, respectively). Compared with ambient deformation, cryogenic deformation can promote the basal slip system activation, dislocation accumulation, and α grain fragmentation. For the heterogeneous equiaxed structure, the grain boundaries between large equiaxed and small fragmented α grains act as barriers for dislocation motion and cause the significant strain gradient and back stress strengthening effect, thus leading to an enhanced strength. On the other hand, the lamellar α fragmentation release the large local stress concentration during cryogenic pre-stretching, which maintains the high work hardening capacity of the alloy. Besides, the parallel lamellar α grains with similar crystal orientation (i.e., macrozone) are destroyed after cryogenic pre-stretching, which is beneficial to hindering the crack propagation during deformation. This study provides an insight into further conquering the strength-ductility paradox of titanium alloys. |
| format | Article |
| id | doaj-art-6699e491306d4b2dad963df77f90ba86 |
| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj-art-6699e491306d4b2dad963df77f90ba862025-01-09T06:12:26ZengElsevierMaterials & Design0264-12752025-01-01249113563Achieving enhanced strength-ductility synergy in heterogeneous equiaxed structured Ti-6Al-4V alloy sheets by cryogenic pre-stretchingLingjian Meng0Zhuoya Zhao1Peng Lin2Zhengyi Jiang3Jingwei Zhao4College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment, Ministry of Education, Taiyuan 030024, ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaSchool of Mechanical, Materials, Biomedical and Mechatronic Engineering, University of Wollongong, NSW 2522, AustraliaCollege of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment, Ministry of Education, Taiyuan 030024, China; Corresponding author at: College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China.Achieving excellent strength-ductility balance in commercial titanium alloys has been recognized as a challenging task. In this study, we designed a heterogeneous equiaxed structure in Ti-6Al-4V alloy via cryogenic pre-stretching at liquid nitrogen temperature. The results show that 7.1% cryogenic pre-stretching of the alloy induces an increased yield/tensile strength of 952 MPa/1005 MPa and maintains a high elongation of 16.1% compared with the as-received alloy (840 MPa/930 MPa and 16.3%, respectively). Compared with ambient deformation, cryogenic deformation can promote the basal slip system activation, dislocation accumulation, and α grain fragmentation. For the heterogeneous equiaxed structure, the grain boundaries between large equiaxed and small fragmented α grains act as barriers for dislocation motion and cause the significant strain gradient and back stress strengthening effect, thus leading to an enhanced strength. On the other hand, the lamellar α fragmentation release the large local stress concentration during cryogenic pre-stretching, which maintains the high work hardening capacity of the alloy. Besides, the parallel lamellar α grains with similar crystal orientation (i.e., macrozone) are destroyed after cryogenic pre-stretching, which is beneficial to hindering the crack propagation during deformation. This study provides an insight into further conquering the strength-ductility paradox of titanium alloys.http://www.sciencedirect.com/science/article/pii/S0264127524009389Ti-6Al-4V alloyCryogenic pre-stretchingHeterogeneous equiaxed structureGrain fragmentationBack stressStrength and ductility |
| spellingShingle | Lingjian Meng Zhuoya Zhao Peng Lin Zhengyi Jiang Jingwei Zhao Achieving enhanced strength-ductility synergy in heterogeneous equiaxed structured Ti-6Al-4V alloy sheets by cryogenic pre-stretching Materials & Design Ti-6Al-4V alloy Cryogenic pre-stretching Heterogeneous equiaxed structure Grain fragmentation Back stress Strength and ductility |
| title | Achieving enhanced strength-ductility synergy in heterogeneous equiaxed structured Ti-6Al-4V alloy sheets by cryogenic pre-stretching |
| title_full | Achieving enhanced strength-ductility synergy in heterogeneous equiaxed structured Ti-6Al-4V alloy sheets by cryogenic pre-stretching |
| title_fullStr | Achieving enhanced strength-ductility synergy in heterogeneous equiaxed structured Ti-6Al-4V alloy sheets by cryogenic pre-stretching |
| title_full_unstemmed | Achieving enhanced strength-ductility synergy in heterogeneous equiaxed structured Ti-6Al-4V alloy sheets by cryogenic pre-stretching |
| title_short | Achieving enhanced strength-ductility synergy in heterogeneous equiaxed structured Ti-6Al-4V alloy sheets by cryogenic pre-stretching |
| title_sort | achieving enhanced strength ductility synergy in heterogeneous equiaxed structured ti 6al 4v alloy sheets by cryogenic pre stretching |
| topic | Ti-6Al-4V alloy Cryogenic pre-stretching Heterogeneous equiaxed structure Grain fragmentation Back stress Strength and ductility |
| url | http://www.sciencedirect.com/science/article/pii/S0264127524009389 |
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