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电磁搅拌对镁合金AZ91D半固态组织的影响 被引量:9

Effect of Electro-magnetic Stirring on Microstructure of Semisolid Magnesium Alloy AZ91D
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摘要 研究了电磁搅拌强度和搅拌时间对镁合金AZ91D半固态组织的影响。结果表明提高搅拌强度和延长搅拌时间均有利于非枝晶组织的形成。电磁搅拌使初生αMg由枝晶状变为球状,是由于搅动引起熔体内热量和物质的快速混合,使熔体内各处的温度和成分均匀,不仅使已生成的树枝晶沿根部熔断分离,而且消除了枝晶生长的条件,无论是熔断的枝晶碎块还是新生成的晶核均生长成球状或近球状。 Effect of electro-magnetic stirring on microstructure of semisolid magnesium alloy AZ91D is studied. Result shows that increasing stirring strength and extending stirring time are benefit the formation of non-dentritic structure. Primary α-Mg dendrites changing from dendritic to spherical is due to that fast heat and mass mixing in the melt pool makes temperature and solute to be more uniformly distributed. These will melt dendrite and make it detach from its root and destroy the growing condition for dendrite. Therefore detached dendrite fragments and new formed nuclei all grow into spherical or near spherical shape.
出处 《铸造技术》 EI CAS 北大核心 2005年第6期497-499,507,共4页 Foundry Technology
基金 山西省青年科技研究基金项目(20031039)
关键词 镁合金 电磁搅拌 半固态组织 机理 Magnesium alloy Electro-magnetic stirring Semisolid structure Mechanism
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