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采用电子束悬浮区熔装置(EBFZM)制备了Si-TaSi2共晶自生复合场发射材料,系统地研究了Si-TaSi2共晶的定向凝固组织特征.当凝固速率在0.3~9.0 mm/min范围内变化时,均可获得Si-TaSi2共晶自生复合材料,具有高精确取向的TaSi2纤维在硅连续基体中均匀分布.随着凝固速率的增大,TaSi2纤维的直径和平均间距减小,面密度和体积分数增大.采用零功率法考察了不同凝固速率时的固-液界面形貌.当凝固速率由0.3mm/min变化到5.0mm/min时,固-液界面经历了平界面→浅胞状界面→胞状界面→平界面的演化过程.

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