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| Effect of Multiple Forging Process on the Microstructure and Properties of Magnesium Alloy |
| GUO Qiang; YAN Hongge; CHEN Zhenhua; ZHANG Hui |
| School of Materials Science and Engineering; Hunan University; Changsha 410082 |
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Cite this article:
GUO Qiang; YAN Hongge; CHEN Zhenhua; ZHANG Hui. Effect of Multiple Forging Process on the Microstructure and Properties of Magnesium Alloy. Acta Metall Sin, 2006, 42(7): 739-744 .
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Abstract The effect of multiple forging process on the microstructure and properties of magnesium alloy was investigated in the present paper. The results show that using the method of multiple forging, a homogeneous microstructure with ultrafine grains（1～2µm）can be attained and mechanical properties of alloy can be significantly improved. The dynamic formation of new grains during the deformation can result from a series of strain-induced continuous reactions that are essentially similar to continuous dynamic recrystallization and the intercrossing deformation bands developed in the coarse grains are beneficial for grain refinement. The microstructure with fine dynamic recrystallized grains can be attained when the applied total strain εx exceeds the critical strain εc which is in the rage of 2～2.4. After that, it is difficult to get more grain refinement further. Fractography demonstrates that the as-cast alloys’ tensile fracture consists of quasi-cleavage fracture mixed a little shear fracture and the microstructure morphologies of the alloy after forging are ductile dimple. At the same time, the dimples increase and exist more homogeneously with the increase of strain.
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Received: 09 October 2005
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