Current-Induced Ductility Enhancement of a Magnesium Alloy AZ31 in Uniaxial Micro-Tension Below 373 K
The size effects in metal forming have been found to be crucial in micro-scale plastic deformation or micro-forming processes, which lead to attenuation of the material’s formability due to the increasing heterogeneity of the plastic flow. The use of an electric field during micro-scale pl...
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MDPI AG
2018-12-01
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| Online Access: | http://www.mdpi.com/1996-1944/12/1/111 |
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| author | Xinwei Wang Antonio J. Sánchez Egea Jie Xu Xianyu Meng Zhenlong Wang Debin Shan Bin Guo Jian Cao |
| author_facet | Xinwei Wang Antonio J. Sánchez Egea Jie Xu Xianyu Meng Zhenlong Wang Debin Shan Bin Guo Jian Cao |
| author_sort | Xinwei Wang |
| collection | DOAJ |
| description | The size effects in metal forming have been found to be crucial in micro-scale plastic deformation or micro-forming processes, which lead to attenuation of the material’s formability due to the increasing heterogeneity of the plastic flow. The use of an electric field during micro-scale plastic deformation has shown to relieve size effects, enhance the material’s formability, modify the microstructure, etc. Consequently, these electric-assisted (EA) micro-forming processes seem to bring many potential benefits that need to be investigated. Accordingly, here we investigated the influence of an electric field on the size effects to describe the fracture behavior in uniaxial micro-tension tests of an AZ31 alloy with various grain sizes. In order to decouple the thermal-mechanical and microstructure changes, room temperature (RT), oven-heated (OH), air-cooled (AC), and EA uniaxial micro-tension tests were conducted. The size effects contribution on the fracture stress and strain showed a similar trend in all the testing configurations. However, the smallest fracture stresses and the largest fracture strains were denoted in the EA configuration. EBSD examination shows that current-induced dynamic recrystallization (DRX) and texture evolution could be negligible under the studied conditions. The kernel average misorientation (KAM) maps give the larger plastic deformation in the EA specimens due to the reduction of plastic micro-heterogeneity. Finally, the fracture morphology indicates that the current-induced ductility enhancement may be attributed to the arrest of micro-crack propagation and the inhibition of void initiation, growth, and coalescence caused by lattice melting and expansion. |
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| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-12T19:51:11Z |
| publishDate | 2018-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-82d6bc3a01c44d7dbfad1bb810f9f0712022-12-22T03:18:49ZengMDPI AGMaterials1996-19442018-12-0112111110.3390/ma12010111ma12010111Current-Induced Ductility Enhancement of a Magnesium Alloy AZ31 in Uniaxial Micro-Tension Below 373 KXinwei Wang0Antonio J. Sánchez Egea1Jie Xu2Xianyu Meng3Zhenlong Wang4Debin Shan5Bin Guo6Jian Cao7Laboratory for Space Environment and Physical Sciences, Harbin Institute of Technology, Harbin 150001, ChinaDepartment of Mechanical and Metallurgical Engineering, Pontificia Universidad Católica de Chile, Santiago 8320000, ChileKey Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150080, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Mechanical Engineering, Harbin Institute of Technology, Harbin 150001, ChinaKey Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150080, ChinaLaboratory for Space Environment and Physical Sciences, Harbin Institute of Technology, Harbin 150001, ChinaDepartment of Mechanical Engineering, Northwestern University, Evanston, IL 60208, USAThe size effects in metal forming have been found to be crucial in micro-scale plastic deformation or micro-forming processes, which lead to attenuation of the material’s formability due to the increasing heterogeneity of the plastic flow. The use of an electric field during micro-scale plastic deformation has shown to relieve size effects, enhance the material’s formability, modify the microstructure, etc. Consequently, these electric-assisted (EA) micro-forming processes seem to bring many potential benefits that need to be investigated. Accordingly, here we investigated the influence of an electric field on the size effects to describe the fracture behavior in uniaxial micro-tension tests of an AZ31 alloy with various grain sizes. In order to decouple the thermal-mechanical and microstructure changes, room temperature (RT), oven-heated (OH), air-cooled (AC), and EA uniaxial micro-tension tests were conducted. The size effects contribution on the fracture stress and strain showed a similar trend in all the testing configurations. However, the smallest fracture stresses and the largest fracture strains were denoted in the EA configuration. EBSD examination shows that current-induced dynamic recrystallization (DRX) and texture evolution could be negligible under the studied conditions. The kernel average misorientation (KAM) maps give the larger plastic deformation in the EA specimens due to the reduction of plastic micro-heterogeneity. Finally, the fracture morphology indicates that the current-induced ductility enhancement may be attributed to the arrest of micro-crack propagation and the inhibition of void initiation, growth, and coalescence caused by lattice melting and expansion.http://www.mdpi.com/1996-1944/12/1/111ductilityfracture behaviorsize effectelectrically assistedmicro-tension |
| spellingShingle | Xinwei Wang Antonio J. Sánchez Egea Jie Xu Xianyu Meng Zhenlong Wang Debin Shan Bin Guo Jian Cao Current-Induced Ductility Enhancement of a Magnesium Alloy AZ31 in Uniaxial Micro-Tension Below 373 K Materials ductility fracture behavior size effect electrically assisted micro-tension |
| title | Current-Induced Ductility Enhancement of a Magnesium Alloy AZ31 in Uniaxial Micro-Tension Below 373 K |
| title_full | Current-Induced Ductility Enhancement of a Magnesium Alloy AZ31 in Uniaxial Micro-Tension Below 373 K |
| title_fullStr | Current-Induced Ductility Enhancement of a Magnesium Alloy AZ31 in Uniaxial Micro-Tension Below 373 K |
| title_full_unstemmed | Current-Induced Ductility Enhancement of a Magnesium Alloy AZ31 in Uniaxial Micro-Tension Below 373 K |
| title_short | Current-Induced Ductility Enhancement of a Magnesium Alloy AZ31 in Uniaxial Micro-Tension Below 373 K |
| title_sort | current induced ductility enhancement of a magnesium alloy az31 in uniaxial micro tension below 373 k |
| topic | ductility fracture behavior size effect electrically assisted micro-tension |
| url | http://www.mdpi.com/1996-1944/12/1/111 |
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