Control of melt convection by a travelling magnetic field during the directional solidification of Al–Ni alloys
Control of melt convection by a travelling magnetic field during the directional solidification of Al–Ni alloys
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DOI：
10.1016/j.crme.2007.05.010
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发表时间：
2007-05
影响因子：
0.8
通讯作者：
K. Zaidat;N. Mangelinck-Noël;R. Moreau
中科院分区：
文献类型：
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作者：
K. Zaidat;N. Mangelinck-Noël;R. Moreau
在金属合金开发领域，主要的工业目标是冶金结构和缺陷的控制。液相中的流体动力运动对凝固产品的性能具有显着影响。我们重点关注行进磁场引起的强制对流所影响的两个主要效应：Al-3.5 wt% Ni 合金的宏观偏析和晶粒结构。我们表明，这种配置可以控制宏观偏析，此外，可以通过改变施加的场来改变枝晶初级间距。关于晶粒结构，我们展示了强制对流对微观结构的影响。对于等轴区域生长，行进磁场对结构过冷和细化器分布的影响导致等轴到拉长的转变。这种机制增强了等轴晶粒的成核和生长。在非精炼合金的情况下，最有可能由于破碎而获得拉长的自由晶粒模式。引用本文：K. Zaïdat 等人，CR Mecanique 335 (2007)。
In the field of the metallic alloy development, the main industrial goals are the control of the metallurgical structure and defects. Hydrodynamic movements in the liquid phase have a significant influence on properties of the solidified product. We focus our attention on two major effects influenced by forced convection induced by a travelling magnetic field: the macrosegregation and the grain structure for Al-3.5 wt% Ni alloys. We show that this configuration can control macrosegregations and that, moreover, the dendritic primary spacing maybe modified by varying the applied field. With regards to the grain structure, we exhibit the effect of the forced convection on the microstructure. For the equiaxed regime growth, the effect of the travelling magnetic field on the constitutional undercooling and on the refiner distribution induces an equiaxed to an elongated transition. This mechanism enhances the nucleation and the growth of equiaxed grains. In the case of non-refined alloys, a mode of elongated free grains is obtained most likely because of fragmentation. To cite this article: K. Zaïdat et al., CR Mecanique 335 (2007).