Effect of Gradient High Magnetic Fields on Growth of Primary Phases and Microstructure of Directionally Solidified Hypoeutectic Mn-Sb Alloy
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摘要: 在不同磁场条件下,对亚共晶Mn-89.7%Sb(w)合金进行了定向凝固和淬火实验,研究了梯度强磁场对合金初生相生长行为及微观组织演变的影响规律及作用机制。在无磁场条件下,初生MnSb相以发达枝晶形貌定向生长。施加强磁场后,初生MnSb相由发达枝晶形貌转变为不规则细小枝晶形貌,合金中出现不规则的块状MnSb/Sb共晶组织,初生MnSb相产生其c轴垂直于磁场方向的晶体取向。对合金淬火组织进行分析,发现在定向凝固过程中,强磁场的作用机制可能为热电磁力在固/液界面处诱发熔体对流引起溶质横向迁移以及初生MnSb相破碎;磁化力在固/液界面处驱动富Mn溶质微区、富Sb溶质微区及初生MnSb相碎片沿纵向迁移,这两种力效果之间的竞争诱发了初生MnSb相的组织演变。
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关键词:
- 亚共晶Mn-Sb合金 /
- 定向凝固 /
- 梯度强磁场 /
- 微观组织
Abstract: Directional solidification and quenching experiments are conducted on hypoeutectic Mn-89.7%Sb(w) alloys under different magnetic field conditions. The influence and mechanism of gradient high magnetic fields on the growth behaviors of primary phases and microstructure evolutions of directionally solidified alloys are investigated. When the magnetic field is 0 T, the primary MnSb phase grows directionally with a well-developed dendritic morphology. When the high magnetic field is applied, the primary MnSb phase transitions from a developed dendritic morphology to an irregular fine dendritic structure, and an irregular block-shaped MnSb/Sb eutectic structure appears in the alloy. The primary MnSb phase exhibites crystal orientation with its c-axis perpendicular to the direction of the magnetic field. The mechanism of the high magnetic field on the quenching micro-structure of the alloys is further explored. It is found out that during the directional solidification, the thermoelectric magnetic force-induced convection at the solid/liquid interface causes lateral migration of solute and fragmentation of the primary MnSb phase. The magnetic force drives the migration of the Mn-rich and Sb-rich zones, as well as the primary MnSb phase fragments, along the longitudinal direction at the solid/liquid interface. The competition between these two forces leads to the evolution of the microstructure of the primary MnSb phase. -
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