Grain refinement of AZ91D alloy by intensive melt shearing and its persistence after remelting and isothermal holding
Intensive melt shearing has a significant grain refining effect on some light alloys. However, the persistence of the grain refining effect during isothermal holding and remelting is still unclear, although it is very important for the practical application. In this study, intensive melt shearing wa...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Foundry Journal Agency
2013-01-01
|
| Series: | China Foundry |
| Subjects: | |
| Online Access: | http://www.foundryworld.com/uploadfile/2013020651747765.pdf |
| _version_ | 1818594948586405888 |
|---|---|
| author | Zuo Yubo Fan Zhongyun Cui Jianzhong |
| author_facet | Zuo Yubo Fan Zhongyun Cui Jianzhong |
| author_sort | Zuo Yubo |
| collection | DOAJ |
| description | Intensive melt shearing has a significant grain refining effect on some light alloys. However, the persistence of the grain refining effect during isothermal holding and remelting is still unclear, although it is very important for the practical application. In this study, intensive melt shearing was achieved in a twin-screw mechanism to investigate its grain refining effect on AZ91D magnesium alloy. The refinement mechanism was discussed and the persistence of grain refinement after remelting and isothermal holding was also studied. A Zeiss imaging system with polarized light was used for quantitative measurement of grain size. The results show that the intensive melt shearing has a significant grain refining effect on AZ91D magnesium alloy. With the application of intensive melt shearing, the grain size of AZ91D magnesium alloy can be reduced from 530 μm (for a typical as-cast microstructure) to 170 μm, which is about 70% size reduction. The grain refinement achieved by the intensive melt shearing can be partially kept after isothermal holding and remelting. It is believed that the refinement effect was mainly due to the finer and well dispersed oxide particles formed by high intensive shearing. The smaller size of oxide particles and their slow motion velocity in the sheared melt could make important contributions to the remained grain refinement. |
| first_indexed | 2024-12-16T11:08:14Z |
| format | Article |
| id | doaj.art-0a08cbeb5d45473286eac275bb6f384e |
| institution | Directory Open Access Journal |
| issn | 1672-6421 |
| language | English |
| last_indexed | 2024-12-16T11:08:14Z |
| publishDate | 2013-01-01 |
| publisher | Foundry Journal Agency |
| record_format | Article |
| series | China Foundry |
| spelling | doaj.art-0a08cbeb5d45473286eac275bb6f384e2022-12-21T22:33:48ZengFoundry Journal AgencyChina Foundry1672-64212013-01-011013942Grain refinement of AZ91D alloy by intensive melt shearing and its persistence after remelting and isothermal holdingZuo YuboFan ZhongyunCui JianzhongIntensive melt shearing has a significant grain refining effect on some light alloys. However, the persistence of the grain refining effect during isothermal holding and remelting is still unclear, although it is very important for the practical application. In this study, intensive melt shearing was achieved in a twin-screw mechanism to investigate its grain refining effect on AZ91D magnesium alloy. The refinement mechanism was discussed and the persistence of grain refinement after remelting and isothermal holding was also studied. A Zeiss imaging system with polarized light was used for quantitative measurement of grain size. The results show that the intensive melt shearing has a significant grain refining effect on AZ91D magnesium alloy. With the application of intensive melt shearing, the grain size of AZ91D magnesium alloy can be reduced from 530 μm (for a typical as-cast microstructure) to 170 μm, which is about 70% size reduction. The grain refinement achieved by the intensive melt shearing can be partially kept after isothermal holding and remelting. It is believed that the refinement effect was mainly due to the finer and well dispersed oxide particles formed by high intensive shearing. The smaller size of oxide particles and their slow motion velocity in the sheared melt could make important contributions to the remained grain refinement.http://www.foundryworld.com/uploadfile/2013020651747765.pdfmagnesium alloymicrostructureintensive melt shearingremeltingisothermal holding |
| spellingShingle | Zuo Yubo Fan Zhongyun Cui Jianzhong Grain refinement of AZ91D alloy by intensive melt shearing and its persistence after remelting and isothermal holding China Foundry magnesium alloy microstructure intensive melt shearing remelting isothermal holding |
| title | Grain refinement of AZ91D alloy by intensive melt shearing and its persistence after remelting and isothermal holding |
| title_full | Grain refinement of AZ91D alloy by intensive melt shearing and its persistence after remelting and isothermal holding |
| title_fullStr | Grain refinement of AZ91D alloy by intensive melt shearing and its persistence after remelting and isothermal holding |
| title_full_unstemmed | Grain refinement of AZ91D alloy by intensive melt shearing and its persistence after remelting and isothermal holding |
| title_short | Grain refinement of AZ91D alloy by intensive melt shearing and its persistence after remelting and isothermal holding |
| title_sort | grain refinement of az91d alloy by intensive melt shearing and its persistence after remelting and isothermal holding |
| topic | magnesium alloy microstructure intensive melt shearing remelting isothermal holding |
| url | http://www.foundryworld.com/uploadfile/2013020651747765.pdf |
| work_keys_str_mv | AT zuoyubo grainrefinementofaz91dalloybyintensivemeltshearinganditspersistenceafterremeltingandisothermalholding AT fanzhongyun grainrefinementofaz91dalloybyintensivemeltshearinganditspersistenceafterremeltingandisothermalholding AT cuijianzhong grainrefinementofaz91dalloybyintensivemeltshearinganditspersistenceafterremeltingandisothermalholding |