| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 106 === Magnesium alloys have been widely used in the automotive industry, bicycle frame, aerospace development and electronic information 3C products and so on. It is an important topics to improve the mechanical properties of the material, and the way of grain refining can be achieved the purpose. In this study, in order to make grain refinement, we applied plastic deformation in multi-pass hot rolling to let the dynamic recrystallization (DRX) be growth in the magnesium alloy sheets. It is expected that the thickness of the magnesium alloy ZK60 sheets can achieve a large reduction and get refined grain size to make the product have better mechanical properties.
The research is based on the recrystallization prediction that has been established in the literature, and to discuss the difference in the multi-pass hot rolling simulation for reduction 50% of magnesium alloy sheets which is carried on in FEM software DEFORM-2D. Then, this study makes multi-pass hot-rolling experiment and the metallographic microstructure observation to compare the same process conditions of FEM solutions to verify the correctness of the simulation, as well as do the discussion of mechanical properties.
Keywords: Multi-pass hot rolling, recrystallization prediction, dynamic recrystallization, microstructure, grain size
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