| Reheating microstructure of refined AZ91D magnesium alloy in semi-solid state |
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| 作者姓名： | 姜巨福 罗守靖 |
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| 作者单位： | SchoolofMaterialsScienceandEngineering,HarbinInstituteofTechnology,Harbin150001,China |
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| 基金项目： | Project ( 4 13 18.4.2 .4)supportedbytheNationalGeneralAccoutrementDepartmentofChina |
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| 摘 要： | By means of equal channel angular extrusion (ECAE) test, upsetting test and metalloseope, reheating mierostruetures of raw casting ingots, materials prepared by SIMA and materials extruded by ECAE in semi-solid state were investigated. The results show that compared with those of raw casting ingots and materials prepared by SIMA, reheating microstrueture of materials extruded by ECAE is the best and the final grain size is the finest. With increasing holding time, a growing phenomenon occurs in reheating microstrueture of materials extruded by ECAE, which can be described by Ostwald ripening law. The average grain size increases firstly, subsequently decreases and the shape factor of grains approaches to 1 as the reheating temperature increases. With increasing equivalent strain, the average grain size decreases. This demonstrates that reheating material extruded by ECAE technology is a good method to prepare AZ91D magnesium alloy semi-solid billets.
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| 关 键 词： | 再加热 微观结构 ECAE 半固态 AZ91D镁合金 |
Reheating microstructure of refined AZ91D magnesium alloy in semi-solid state |
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| JIANG Ju-fu,LUO Shou-jing.Reheating microstructure of refined AZ91D magnesium alloy in semi-solid state[J].Transactions of Nonferrous Metals Society of China,2004,14(6):1074-1081. |
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| Authors: | JIANG Ju-fu LUO Shou-jing |
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| Abstract: | By means of equal channel angular extrusion (ECAE) test, upsetting test and metalloscope, reheating microstructures of raw casting ingots, materials prepared by SIMA and materials extruded by ECAE in semi-solid state were investigated. The results show that compared with those of raw casting ingots and materials prepared by SIMA, reheating microstructure of materials extruded by ECAE is the best and the final grain size is the finest.With increasing holding time, a growing phenomenon occurs in reheating microstructure of materials extruded by ECAE, which can be described by Ostwald ripening law. The average grain size increases firstly, subsequently decreases and the shape factor of grains approaches to 1 as the reheating temperature increases. With increasing equivalent strain, the average grain size decreases. This demonstrates that reheating material extruded by ECAE technology is a good method to prepare AZ91D magnesium alloy semi-solid billets. |
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| Keywords: | AZ91D magnesium alloy semi-solid state reheating microstructure |
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