Application of cyclic upsetting-extrusion to semi-solid processing of AZ91D magnesium alloy |
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Authors: | Jian-quan TAO Ju-fu JIANG Hong CHEN Yuan-lun XIAO Rong-chao ZHANG Qing-hua HU Jun ZHAO Qiang ZHAO |
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Affiliation: | 1. Southwest Technique and Engineering Institute, Chongqing 400039, China;2. School of Materials and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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Abstract: | The microstructural evolution of AZ91D magnesium alloy prepared by means of the cyclic upsetting-extrusion and partial remelting was investigated. The effects of remelting temperature and holding time on microstructure of semi-solid AZ91D magnesium alloy were studied. Furthermore, tensile properties of thixoextruded AZ91D magnesium alloy components were determined. The results show that the cyclic upsetting-extrusion followed by partial remelting is effective in producing semi-solid AZ91D magnesium alloy for thixoforming. During the partial remelting, with the increase of remelting temperature and holding time, the solid grain size increases and the degree of spheroidization tends to be improved. The tensile mechanical properties of thixoextruded AZ91D magnesium alloy components produced by cyclic upsetting-extrusion and partial remelting are better than those of the same alloy produced by casting. |
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Keywords: | AZ91D magnesium alloy semi-solid processing cyclic upsetting-extrusion mechanical properties microstructure |
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