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杨伟,殷海眯,聂海明,余欢.SiC颗粒参与下亚快速凝固镁合金组织与性能研究[J].稀有金属材料与工程(英文),2017,46(10):3146~3150.[Yang Wei,Yin Haimi,Nie Haiming and Yu Huan.Microstructure and Property of Sub-rapid Solidified Magnesium Alloy Containing SiC Particle[J].Rare Metal Materials and Engineering,2017,46(10):3146~3150.]
Microstructure and Property of Sub-rapid Solidified Magnesium Alloy Containing SiC Particle
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Received:August 03, 2015  Revised:September 18, 2015
Key words: Non-equilibrium solidification  heterogeneous nucleation  grain refinement  magnesium alloy
Foundation item:国家自然科学基金资助(51461032, 51164028),江西省教育厅青年基金(GJJ14504), 轻合金加工科学与技术国防重点学科实验室开放课题(GF201201003)
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Yang Wei,Yin Haimi,Nie Haiming and Yu Huan  
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      Adopting vacuum induction melting and step copper mould casting method, non-equilibrium solidified AZ91 magnesium alloy containing SiC particle was fabricated. Then, the microstructure evolution regularity of sub-rapid solidified alloys was revealed considering the effects of heterogeneous particle and cooling rate. In the condition of same inner diameter of copper mould, the addition of SiC particle is beneficial for the refinement of magnesium alloy. After solid solution treatment at 400℃, the β-Mg17Al12 phase at the grain boundary disappears gradually, accompanied by the morphology transition of primary α-Mg from fine granular to polygonal structure. Due to the pinning effect of SiC for grain growth at higher temperature, the initial refined microstructure can be saved after 2h and the whole grain size distribution becomes homogeneous. With decreasing the diameter of copper mould, the cooling rate during solidification is increased and the grain refinement is enhanced as well. As for the specimen with the addition of 2wt% SiC and diameter of 2mm, maximum hardness with the value of 142Hv can be obtained, which is increased by 87% in comparison with the as-cast alloy.