以Si-Ta合金为研究对象,采用零功率法研究凝固速率对定向凝固固液界面稳定性的影响.结果表明:当凝固速率在0.3～9.0mm/min范围内,随着凝固速率的增大,固液界面经历了平界面→浅胞状界面→锯齿状界面→浅胞状界面→平界面的演化规律.在较低的凝固速率范围之内,实验结果与理论计算基本吻合.然而,在较高凝固速率时,实验结果与理论计算出现偏差,这是由于热力学和动力学均发生变化,使得在凝固速率V=5.0mm/min时固液界面就已经达到了稳定的平界面.
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