强磁场可明显影响Al-4.5%Cu(质量分数)合金定向凝固组织.在温度梯度GT=38 K/cm, 生长速率较低(R=5 μm/s)时, 10 T强磁场使液-固界面处的树枝晶变得不规则,低于共晶温度以下的固相区定向枝晶组织消失, 组织细化;在生长速率R=50 μm/s时, 10 T强磁场使得枝晶沿与凝固方向成一定角度定向排列, X射线衍射表明<111>方向转向磁场方向; 在生长速率较高(R=100 μm/s)的情况下, 10 T强磁场使得枝晶粗化, 一次枝晶间距增大. 从热电磁流体理论和磁晶的各向异性角度分析了上述现象.
An investigation into the microstructure in directional solidified hypoeutectic Al-4.5Cuwt.％alloys under a longitudinal magnetic field shows that the field has a great influence on the dendritic arrays. The field causes severe distortion in the dendritic array morphology in the mushy zone and disappeared below the eutectic isotherm at lower growth speed R=5µm/s, as opposed to the well-aligned dendritic crystals in the absence of the field; At the growth speed R=50µm/s and a temperature gradient in the liquid of 38K/cm, the alignment structure forms and the crystal direction <111> turns to the direction of the magnetic field, as opposed to the dendrite growth along the crystal direction<100>. It has also been found the field causes the increase of primary dendrite arm spacing at the growth speed R=100µm/s, Above phenomena is analysed on the base of the TEMHD theory and crystal.magnetic anisotropy theory.
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