Strength-ductility balance of AZ31 magnesium alloy via accumulated extrusion bonding combined with two-stage artificial cooling
AZ31 Mg alloy with heterogeneous bimodal grain structure (smaller grain size of 5–20 µm and coarser grain size of 100–200 µm) was subjected to accumulated extrusion bonding (AEB) at 250 ℃ combined with two-stage artificial cooling in this work, viz. local water cooling and artificial cooling. The mi...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-05-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956721001717 |
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| author | Tingzhuang Han Guangsheng Huang Heng Li Lifei Wang Hua Zhang Fusheng Pan |
| author_facet | Tingzhuang Han Guangsheng Huang Heng Li Lifei Wang Hua Zhang Fusheng Pan |
| author_sort | Tingzhuang Han |
| collection | DOAJ |
| description | AZ31 Mg alloy with heterogeneous bimodal grain structure (smaller grain size of 5–20 µm and coarser grain size of 100–200 µm) was subjected to accumulated extrusion bonding (AEB) at 250 ℃ combined with two-stage artificial cooling in this work, viz. local water cooling and artificial cooling. The microstructure developed consecutively as a result of discontinuous dynamic recrystallization (DDRX) for the AEBed samples. {10–12} tensile twinning also played an important role for the AEB with local water cooling at the initial extrusion stage in the container. Local water cooling could further reduce the DRXed grain size to ∼2.1 µm comparing that without water cooling. And the grain growth rate was reduced by artificial cooling out of extrusion die. Under the combination of two-stage cooling, the fine DRXed grains at sizing band were almost retained with average grain size of ∼2.3 µm after the sheet out of extrusion die, and the unDRXed grains with high residual dislocation density accumulation were also reserved. The tensile tests results indicated that a good strength-ductility balance with a high ultimate tensile strength (319 MPa vs. 412 MPa) and fracture elongation (19.9% vs. 30.3%) were obtained. The strength enhancement was mainly owing to the grain refinement and local residual plastic strain reserved by the artificial cooling. The excellent ductility originated from fine DRXed microstructure and ED-tilt double peak texture. |
| first_indexed | 2024-03-13T02:36:24Z |
| format | Article |
| id | doaj.art-83187872e7da4aee8f9dbc7d1e6f1322 |
| institution | Directory Open Access Journal |
| issn | 2213-9567 |
| language | English |
| last_indexed | 2024-03-13T02:36:24Z |
| publishDate | 2023-05-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj.art-83187872e7da4aee8f9dbc7d1e6f13222023-06-29T04:14:18ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672023-05-0111515491555Strength-ductility balance of AZ31 magnesium alloy via accumulated extrusion bonding combined with two-stage artificial coolingTingzhuang Han0Guangsheng Huang1Heng Li2Lifei Wang3Hua Zhang4Fusheng Pan5State Key Laboratory of Solidification Processing, School of Materials Science & Engineering, Northwestern Polytechnical University, Xi' an 710072, PR China; Shaanxi Key Lab oratory of High-Performance Precision Forming Technology and Equipment, Northwestern Polytechnical University, Xi'an 710072, PR China; Corresponding author at: State Key Laboratory of Solidification Processing, School of Materials Science & Engineering, Northwestern Polytechnical University, Xi' an 710072, PR China.State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR ChinaState Key Laboratory of Solidification Processing, School of Materials Science & Engineering, Northwestern Polytechnical University, Xi' an 710072, PR China; Shaanxi Key Lab oratory of High-Performance Precision Forming Technology and Equipment, Northwestern Polytechnical University, Xi'an 710072, PR ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai 264005, PR ChinaState Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR ChinaAZ31 Mg alloy with heterogeneous bimodal grain structure (smaller grain size of 5–20 µm and coarser grain size of 100–200 µm) was subjected to accumulated extrusion bonding (AEB) at 250 ℃ combined with two-stage artificial cooling in this work, viz. local water cooling and artificial cooling. The microstructure developed consecutively as a result of discontinuous dynamic recrystallization (DDRX) for the AEBed samples. {10–12} tensile twinning also played an important role for the AEB with local water cooling at the initial extrusion stage in the container. Local water cooling could further reduce the DRXed grain size to ∼2.1 µm comparing that without water cooling. And the grain growth rate was reduced by artificial cooling out of extrusion die. Under the combination of two-stage cooling, the fine DRXed grains at sizing band were almost retained with average grain size of ∼2.3 µm after the sheet out of extrusion die, and the unDRXed grains with high residual dislocation density accumulation were also reserved. The tensile tests results indicated that a good strength-ductility balance with a high ultimate tensile strength (319 MPa vs. 412 MPa) and fracture elongation (19.9% vs. 30.3%) were obtained. The strength enhancement was mainly owing to the grain refinement and local residual plastic strain reserved by the artificial cooling. The excellent ductility originated from fine DRXed microstructure and ED-tilt double peak texture.http://www.sciencedirect.com/science/article/pii/S2213956721001717Magnesium alloyAccumulated extrusion bondingLocal water coolingArtificial coolingMicrostructureMechanical properties |
| spellingShingle | Tingzhuang Han Guangsheng Huang Heng Li Lifei Wang Hua Zhang Fusheng Pan Strength-ductility balance of AZ31 magnesium alloy via accumulated extrusion bonding combined with two-stage artificial cooling Journal of Magnesium and Alloys Magnesium alloy Accumulated extrusion bonding Local water cooling Artificial cooling Microstructure Mechanical properties |
| title | Strength-ductility balance of AZ31 magnesium alloy via accumulated extrusion bonding combined with two-stage artificial cooling |
| title_full | Strength-ductility balance of AZ31 magnesium alloy via accumulated extrusion bonding combined with two-stage artificial cooling |
| title_fullStr | Strength-ductility balance of AZ31 magnesium alloy via accumulated extrusion bonding combined with two-stage artificial cooling |
| title_full_unstemmed | Strength-ductility balance of AZ31 magnesium alloy via accumulated extrusion bonding combined with two-stage artificial cooling |
| title_short | Strength-ductility balance of AZ31 magnesium alloy via accumulated extrusion bonding combined with two-stage artificial cooling |
| title_sort | strength ductility balance of az31 magnesium alloy via accumulated extrusion bonding combined with two stage artificial cooling |
| topic | Magnesium alloy Accumulated extrusion bonding Local water cooling Artificial cooling Microstructure Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2213956721001717 |
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