采用电子束悬浮区熔定向凝固技术制备了Ni-Ni3Si共晶自生复合材料,在稳态晶体生长区,采用零功率法获取了不同凝固速率的固-液界面.研究表明,随凝固速率的增大,固-液界面的形态发生了明显的变化.在凝固速率较低时,固-液界面基本保持平界面,形成的是规则的层片状共晶组织.随凝固速率的增大,成分过冷增大,平界面失稳,凝固组织的规则性也降低.此外,根据M-S界面稳定性判据,计算了不同凝固速率不同干扰波长对固-液界面稳定性的影响,理论计算与实验结果基本吻合.
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