The research on the effect of MgCO3 on the grain refinement in AZ31 magnesium alloy |
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| Authors: | S.‐Y. Gao J.‐Z. Cui Q.‐C. Li Z.‐Q. Zhang |
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| Affiliation: | Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, China |
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| Abstract: | The effect of MgCO3 addition on the as‐cast microstructure of AZ31 magnesium alloy has been widely investigated. The results show that the average grain size of the α‐Mg grain in AZ31 magnesium alloy decreases from about 570 μm to 100 μm by the addition of 0.6 wt.% MgCO3 as gain refiner at 760°C. Based on the analysis of EDS, theoretical calculation of Ebind and Gibbs free energy, we esteem that grain refiner mechanism is mainly attributed to the generation of Al4C3, which can be serviced as nucleation site and restrain grain boundary from growing and transferring. |
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| Keywords: | AZ31 MgCO3 grain refinement Al3C4 |
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