Reducing the tension-compression yield asymmetry in an extruded ZK60 alloy by ultrafine grains
Ultrafine-grained ZK60 alloys were successfully fabricated by powder metallurgy followed by hot extrusion at different temperatures. The effects of the texture changes of ultrafine-grained ZK60 magnesium alloy on the asymmetry of tension-compression yield under different extrusion temperatures, and...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2018-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/aadd6b |
| _version_ | 1797747230023614464 |
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| author | Jinhui Wang Xiaoqiang Li Peipeng Jin Shangpeng Li Guojun Ma Lei Zhao |
| author_facet | Jinhui Wang Xiaoqiang Li Peipeng Jin Shangpeng Li Guojun Ma Lei Zhao |
| author_sort | Jinhui Wang |
| collection | DOAJ |
| description | Ultrafine-grained ZK60 alloys were successfully fabricated by powder metallurgy followed by hot extrusion at different temperatures. The effects of the texture changes of ultrafine-grained ZK60 magnesium alloy on the asymmetry of tension-compression yield under different extrusion temperatures, and the relation between texture evolution and mechanical properties of the alloys during axial tension-compression deformation were studied. The results show that, in the ultrafine-grained ZK60 alloy, the initial texture of the alloy is a weak (0002) basal fiber texture. As the extrusion temperature increases from 523 to 623 K, the fibrous texture of the base material is weakened, and the tension-compression yield asymmetry is depressed from 1.1 to 1.0. During axial tensile deformation, twinning is not activated. With increasing tensile strain, no significant rotation of crystal grains occurs, and the stress remains stable until tensile fracture occurs. In the early stage of axial compression yield, no significant rotation of crystal grains occurs. As the compressive strain increases until the end of the compressive strain, the (0002) basal plane of the crystal grains rotates in a direction approximately perpendicular to the compression axis. At this point, the grain orientation factor is low, and the slip system is still in a hard orientation and is inhibited by the ultrafine grains. Twinning is difficult to start, so that the strain hardening rate rises rapidly until compression fracture occurs. Therefore, the weak extruding fiber texture of the basal plane and the ultrafine-grained structure both determine the deformation mechanism of ZK60 alloys at room temperature during axial tension and compression deformation, thereby significantly depressing the axial tension-compression asymmetry of ZK60 alloys. |
| first_indexed | 2024-03-12T15:47:50Z |
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| id | doaj.art-53886c5df9414465bf598755d8466b0a |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:47:50Z |
| publishDate | 2018-01-01 |
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| series | Materials Research Express |
| spelling | doaj.art-53886c5df9414465bf598755d8466b0a2023-08-09T15:19:42ZengIOP PublishingMaterials Research Express2053-15912018-01-0151111651810.1088/2053-1591/aadd6bReducing the tension-compression yield asymmetry in an extruded ZK60 alloy by ultrafine grainsJinhui Wang0Xiaoqiang Li1https://orcid.org/0000-0001-7363-6040Peipeng Jin2Shangpeng Li3Guojun Ma4Lei Zhao5Qinghai Provincial Key Laboratory of New Light Alloys, Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University , Xining 810016, People’s Republic of ChinaQinghai Provincial Key Laboratory of New Light Alloys, Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University , Xining 810016, People’s Republic of ChinaQinghai Provincial Key Laboratory of New Light Alloys, Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University , Xining 810016, People’s Republic of ChinaQinghai Provincial Key Laboratory of New Light Alloys, Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University , Xining 810016, People’s Republic of ChinaQinghai Provincial Key Laboratory of New Light Alloys, Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University , Xining 810016, People’s Republic of ChinaQinghai Provincial Key Laboratory of New Light Alloys, Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University , Xining 810016, People’s Republic of ChinaUltrafine-grained ZK60 alloys were successfully fabricated by powder metallurgy followed by hot extrusion at different temperatures. The effects of the texture changes of ultrafine-grained ZK60 magnesium alloy on the asymmetry of tension-compression yield under different extrusion temperatures, and the relation between texture evolution and mechanical properties of the alloys during axial tension-compression deformation were studied. The results show that, in the ultrafine-grained ZK60 alloy, the initial texture of the alloy is a weak (0002) basal fiber texture. As the extrusion temperature increases from 523 to 623 K, the fibrous texture of the base material is weakened, and the tension-compression yield asymmetry is depressed from 1.1 to 1.0. During axial tensile deformation, twinning is not activated. With increasing tensile strain, no significant rotation of crystal grains occurs, and the stress remains stable until tensile fracture occurs. In the early stage of axial compression yield, no significant rotation of crystal grains occurs. As the compressive strain increases until the end of the compressive strain, the (0002) basal plane of the crystal grains rotates in a direction approximately perpendicular to the compression axis. At this point, the grain orientation factor is low, and the slip system is still in a hard orientation and is inhibited by the ultrafine grains. Twinning is difficult to start, so that the strain hardening rate rises rapidly until compression fracture occurs. Therefore, the weak extruding fiber texture of the basal plane and the ultrafine-grained structure both determine the deformation mechanism of ZK60 alloys at room temperature during axial tension and compression deformation, thereby significantly depressing the axial tension-compression asymmetry of ZK60 alloys.https://doi.org/10.1088/2053-1591/aadd6bpowder metallurgyultrafine grainZK60 alloytension-compression asymmetry |
| spellingShingle | Jinhui Wang Xiaoqiang Li Peipeng Jin Shangpeng Li Guojun Ma Lei Zhao Reducing the tension-compression yield asymmetry in an extruded ZK60 alloy by ultrafine grains Materials Research Express powder metallurgy ultrafine grain ZK60 alloy tension-compression asymmetry |
| title | Reducing the tension-compression yield asymmetry in an extruded ZK60 alloy by ultrafine grains |
| title_full | Reducing the tension-compression yield asymmetry in an extruded ZK60 alloy by ultrafine grains |
| title_fullStr | Reducing the tension-compression yield asymmetry in an extruded ZK60 alloy by ultrafine grains |
| title_full_unstemmed | Reducing the tension-compression yield asymmetry in an extruded ZK60 alloy by ultrafine grains |
| title_short | Reducing the tension-compression yield asymmetry in an extruded ZK60 alloy by ultrafine grains |
| title_sort | reducing the tension compression yield asymmetry in an extruded zk60 alloy by ultrafine grains |
| topic | powder metallurgy ultrafine grain ZK60 alloy tension-compression asymmetry |
| url | https://doi.org/10.1088/2053-1591/aadd6b |
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