Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents
The creep behavior and microstructural evolution of three Al–Cu–Mg–Ag alloys with Cu content around its solid solubility limit in Al (5.65 wt %) were investigated at 180–240 °C and applied stress of 150–300 MPa. The creep resistance of aged alloy, which is mainly determined by the number density of...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-03-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/11/3/487 |
| _version_ | 1827697621469233152 |
|---|---|
| author | Fangle Peng Jiefang Wang Ruibin Yang Yage Xia Guopeng Zhang Bin Cai |
| author_facet | Fangle Peng Jiefang Wang Ruibin Yang Yage Xia Guopeng Zhang Bin Cai |
| author_sort | Fangle Peng |
| collection | DOAJ |
| description | The creep behavior and microstructural evolution of three Al–Cu–Mg–Ag alloys with Cu content around its solid solubility limit in Al (5.65 wt %) were investigated at 180–240 °C and applied stress of 150–300 MPa. The creep resistance of aged alloy, which is mainly determined by the number density of Ω phase, is the best for 6.00 wt % Cu, better for 5.30 wt % Cu, and the worst for 5.65 wt % Cu. After solid-solution treatment, the lowest Cu content in the Al matrix for the alloy with 5.65 wt % Cu is observed due to the existence of more residual phases. It results in the lowest number density of Ω phase the following aging and poor creep resistance. Increasing temperature from 180 to 240 °C at the same stress (225 MPa), the steady creep rate of alloys increases by 225 times, which is apparently larger than that (26 times) for increasing stress from 225 to 300 MPa at the same temperature (180 °C). It indicates that the coarsening of the Ω phase with increasing temperature should be more serious than that with increasing stress. The creep mechanism of Al–Cu–Mg–Ag alloy can be attributed to the dislocation climb with the existence of threshold stress. |
| first_indexed | 2024-03-10T13:12:31Z |
| format | Article |
| id | doaj.art-5a4514997ba74b6b840e83b4e4849448 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T13:12:31Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-5a4514997ba74b6b840e83b4e48494482023-11-21T10:37:30ZengMDPI AGMetals2075-47012021-03-0111348710.3390/met11030487Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu ContentsFangle Peng0Jiefang Wang1Ruibin Yang2Yage Xia3Guopeng Zhang4Bin Cai5Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, ChinaKey Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, ChinaCollege of Basic Sciences, Zhengzhou Institute of Technology, Zhengzhou 450044, ChinaKey Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, ChinaKey Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, ChinaKey Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, ChinaThe creep behavior and microstructural evolution of three Al–Cu–Mg–Ag alloys with Cu content around its solid solubility limit in Al (5.65 wt %) were investigated at 180–240 °C and applied stress of 150–300 MPa. The creep resistance of aged alloy, which is mainly determined by the number density of Ω phase, is the best for 6.00 wt % Cu, better for 5.30 wt % Cu, and the worst for 5.65 wt % Cu. After solid-solution treatment, the lowest Cu content in the Al matrix for the alloy with 5.65 wt % Cu is observed due to the existence of more residual phases. It results in the lowest number density of Ω phase the following aging and poor creep resistance. Increasing temperature from 180 to 240 °C at the same stress (225 MPa), the steady creep rate of alloys increases by 225 times, which is apparently larger than that (26 times) for increasing stress from 225 to 300 MPa at the same temperature (180 °C). It indicates that the coarsening of the Ω phase with increasing temperature should be more serious than that with increasing stress. The creep mechanism of Al–Cu–Mg–Ag alloy can be attributed to the dislocation climb with the existence of threshold stress.https://www.mdpi.com/2075-4701/11/3/487Al–Cu–Mg–Ag alloycreep behaviorhigh Cu contentsolid solubility limitΩ phase |
| spellingShingle | Fangle Peng Jiefang Wang Ruibin Yang Yage Xia Guopeng Zhang Bin Cai Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents Metals Al–Cu–Mg–Ag alloy creep behavior high Cu content solid solubility limit Ω phase |
| title | Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents |
| title_full | Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents |
| title_fullStr | Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents |
| title_full_unstemmed | Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents |
| title_short | Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents |
| title_sort | creep behavior and microstructural evolution of al cu mg ag alloys with various high cu contents |
| topic | Al–Cu–Mg–Ag alloy creep behavior high Cu content solid solubility limit Ω phase |
| url | https://www.mdpi.com/2075-4701/11/3/487 |
| work_keys_str_mv | AT fanglepeng creepbehaviorandmicrostructuralevolutionofalcumgagalloyswithvarioushighcucontents AT jiefangwang creepbehaviorandmicrostructuralevolutionofalcumgagalloyswithvarioushighcucontents AT ruibinyang creepbehaviorandmicrostructuralevolutionofalcumgagalloyswithvarioushighcucontents AT yagexia creepbehaviorandmicrostructuralevolutionofalcumgagalloyswithvarioushighcucontents AT guopengzhang creepbehaviorandmicrostructuralevolutionofalcumgagalloyswithvarioushighcucontents AT bincai creepbehaviorandmicrostructuralevolutionofalcumgagalloyswithvarioushighcucontents |