Influence of pre-stretching at ambient and cryogenic temperatures on dislocation configuration, precipitation behaviour, and mechanical properties of 2195 Al-Cu-Li alloy
A novel treatment process that involves solution treatment, cryogenic pre-stretching, and artificial aging was applied to strengthen Al-Cu-Li alloy without ductility sacrificing in this work. The influence of pre-stretching deformation at ambient (RT, 25 °C) and cryogenic (CT, −196 °C) temperatures...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422020154 |
| _version_ | 1828054029582729216 |
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| author | Fan Ye Youxing Yu Baoshuai Zhang Jian Rong Donglei He Baoshuai Han Xiaoguang Ma Yuansong Zeng Yanjin Xu Sujun Wu |
| author_facet | Fan Ye Youxing Yu Baoshuai Zhang Jian Rong Donglei He Baoshuai Han Xiaoguang Ma Yuansong Zeng Yanjin Xu Sujun Wu |
| author_sort | Fan Ye |
| collection | DOAJ |
| description | A novel treatment process that involves solution treatment, cryogenic pre-stretching, and artificial aging was applied to strengthen Al-Cu-Li alloy without ductility sacrificing in this work. The influence of pre-stretching deformation at ambient (RT, 25 °C) and cryogenic (CT, −196 °C) temperatures on dislocation configuration, precipitation behaviour, and after-aging mechanical properties of AA2195 was systematically investigated. Compared with conventional RT-stretched sample, the after-aging yield strength (YS) of CT-stretched sample was increased from 618 MPa to 655 MPa with ductility of 11.6%. The increased strength resulted from the combination of strain hardening and precipitation strengthening. The activated immovable dislocations on {100}Al during CT-stretching obstructed the subsequent slip of following dislocations to grain boundaries, prevented the dislocations piling-up at grain boundaries, and facilitated the dislocation accumulation at grain interior. The increased dislocations density within grains not only provided higher strain hardening to the alloy but also promoted the nucleation of T1 phase in the matrix, which significantly increased the yield strength. Additionally, the reduction of grain boundary dislocations suppressed the precipitation of T1 at grain boundaries, which prevented the formation of precipitate-free zones (PFZs) and the stress concentration at grain boundary during deformation, enhancing the alloy ductility. |
| first_indexed | 2024-04-10T20:17:02Z |
| format | Article |
| id | doaj.art-2695d2686fdd44c5a068fa946f0870be |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-10T20:17:02Z |
| publishDate | 2023-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-2695d2686fdd44c5a068fa946f0870be2023-01-26T04:46:34ZengElsevierJournal of Materials Research and Technology2238-78542023-01-012229832995Influence of pre-stretching at ambient and cryogenic temperatures on dislocation configuration, precipitation behaviour, and mechanical properties of 2195 Al-Cu-Li alloyFan Ye0Youxing Yu1Baoshuai Zhang2Jian Rong3Donglei He4Baoshuai Han5Xiaoguang Ma6Yuansong Zeng7Yanjin Xu8Sujun Wu9School of Materials Science and Engineering, Beihang University, Beijing, 100191, PR China; International Research Center for Advanced Structural and Biomaterials, Beihang University, Beijing, 100191, PR ChinaSchool of Materials Science and Engineering, Beihang University, Beijing, 100191, PR ChinaSchool of Materials Science and Engineering, Beihang University, Beijing, 100191, PR ChinaSchool of Materials Science and Engineering, Beihang University, Beijing, 100191, PR ChinaSchool of Materials Science and Engineering, Beihang University, Beijing, 100191, PR ChinaAVIC Manufacturing Technology Institute, Beijing, 100024, PR ChinaAVIC Manufacturing Technology Institute, Beijing, 100024, PR ChinaAVIC Manufacturing Technology Institute, Beijing, 100024, PR ChinaAVIC Manufacturing Technology Institute, Beijing, 100024, PR China; Corresponding author.School of Materials Science and Engineering, Beihang University, Beijing, 100191, PR China; International Research Center for Advanced Structural and Biomaterials, Beihang University, Beijing, 100191, PR China; Corresponding author.A novel treatment process that involves solution treatment, cryogenic pre-stretching, and artificial aging was applied to strengthen Al-Cu-Li alloy without ductility sacrificing in this work. The influence of pre-stretching deformation at ambient (RT, 25 °C) and cryogenic (CT, −196 °C) temperatures on dislocation configuration, precipitation behaviour, and after-aging mechanical properties of AA2195 was systematically investigated. Compared with conventional RT-stretched sample, the after-aging yield strength (YS) of CT-stretched sample was increased from 618 MPa to 655 MPa with ductility of 11.6%. The increased strength resulted from the combination of strain hardening and precipitation strengthening. The activated immovable dislocations on {100}Al during CT-stretching obstructed the subsequent slip of following dislocations to grain boundaries, prevented the dislocations piling-up at grain boundaries, and facilitated the dislocation accumulation at grain interior. The increased dislocations density within grains not only provided higher strain hardening to the alloy but also promoted the nucleation of T1 phase in the matrix, which significantly increased the yield strength. Additionally, the reduction of grain boundary dislocations suppressed the precipitation of T1 at grain boundaries, which prevented the formation of precipitate-free zones (PFZs) and the stress concentration at grain boundary during deformation, enhancing the alloy ductility.http://www.sciencedirect.com/science/article/pii/S2238785422020154Al-Cu-Li alloysPre-stretchingCryogenic deformationDislocations |
| spellingShingle | Fan Ye Youxing Yu Baoshuai Zhang Jian Rong Donglei He Baoshuai Han Xiaoguang Ma Yuansong Zeng Yanjin Xu Sujun Wu Influence of pre-stretching at ambient and cryogenic temperatures on dislocation configuration, precipitation behaviour, and mechanical properties of 2195 Al-Cu-Li alloy Journal of Materials Research and Technology Al-Cu-Li alloys Pre-stretching Cryogenic deformation Dislocations |
| title | Influence of pre-stretching at ambient and cryogenic temperatures on dislocation configuration, precipitation behaviour, and mechanical properties of 2195 Al-Cu-Li alloy |
| title_full | Influence of pre-stretching at ambient and cryogenic temperatures on dislocation configuration, precipitation behaviour, and mechanical properties of 2195 Al-Cu-Li alloy |
| title_fullStr | Influence of pre-stretching at ambient and cryogenic temperatures on dislocation configuration, precipitation behaviour, and mechanical properties of 2195 Al-Cu-Li alloy |
| title_full_unstemmed | Influence of pre-stretching at ambient and cryogenic temperatures on dislocation configuration, precipitation behaviour, and mechanical properties of 2195 Al-Cu-Li alloy |
| title_short | Influence of pre-stretching at ambient and cryogenic temperatures on dislocation configuration, precipitation behaviour, and mechanical properties of 2195 Al-Cu-Li alloy |
| title_sort | influence of pre stretching at ambient and cryogenic temperatures on dislocation configuration precipitation behaviour and mechanical properties of 2195 al cu li alloy |
| topic | Al-Cu-Li alloys Pre-stretching Cryogenic deformation Dislocations |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422020154 |
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