Samples of near-eutectic Mo–Si–B alloys, with the nominal composition corresponding to the Mo_ss + Mo₃Si + T₂ eutectic area, were prepared by arc-melting or by crucible-free zone-melting methods (directional solidification). In the directionally solidified (DSed) alloy, the volume fraction of the Mo_ss + Mo₃Si + T₂ eutectic cells appeared to increase compared with that of arc-melted (AMed) alloy, and well-aligned and rod-shaped Mo_ss and T₂ phases were formed in a Mo₃Si matrix of the eutectic cells. In the AMed alloy, only the T₂ phase showed a <100] preferential growth orientation along the solidification direction, whereas the Mo_ss phase displayed no obvious preferred orientation. The Mo₃Si matrix showed a weak preference toward <001> growth along the solidification direction in the AMed alloy, and this became much stronger in the DSed alloy. Furthermore, the DSed alloy exhibited an apparent preferential growth orientation relationship of <001>Mo_ss//<001>Mo₃Si//<100]T₂ along the solidification direction. However, no specific atomic structures were observed at the interfaces, indicating that the three phases grew independently from the liquid without the formation of any habit interface during solidification.

通过电弧熔化或无坩埚区域熔化法（定向凝固）制备了标称成分对应于Mo _ss  + Mo ₃ Si + T ₂共晶区域的近共晶Mo-Si-B合金样品。在定向凝固（DSed）合金中，Mo _ss  + Mo ₃ Si + T ₂共晶电池的体积分数似乎比电弧熔化（AMed）合金的体积分数高，并且排列良好且呈棒状的Mo _ss在共晶电池的Mo ₃ Si基质中形成了T ₂和T ₂相。在AMed合金中，只有T ₂相显示沿凝固方向的<100]优先生长取向，而Mo _ss相则没有明显的优选取向。在AMed合金中，Mo ₃ Si基体对沿凝固方向的<001>生长表现出较弱的偏好，而在DSed合金中，Mo ₃ Si基体变得更强。此外，DSed合金沿凝固方向表现出明显的优先生长取向关系，其为<001> Mo _ss /// <001> Mo ₃ Si // <100] T ₂。但是，在界面处未观察到特定的原子结构，这表明在固化过程中三相独立于液体生长，而没有形成任何惯性界面。