(1. 中国科学院 力学研究所 非线性力学国家重点实验室，
北京 100080;
2. 郑州大学 材料研究中心， 郑州 450002)
摘 要: 用平面流铸技术制备了Ni25Al75合金条带，利用XRD， TEM和EDS对快速凝固后的显微组织和微区成分进行了分析。 研究表明， Ni-Al合金快速凝固过程中的包晶反应受到了很大程度的抑制， 从而影响到快速凝固进程， 造成最终相组成中出现了平衡条件下不可能出现的α（Al）， 并使NiAl3相有效合金浓度和生长速度增加， 导致最终相组成中NiAl3相质量分数增加。
关键字: Ni-Al合金； 快速凝固； 包晶反应
（1. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics,
Chinese Academy of Sciences, Beijing 100080, China;
2. Materials Research Center, Zhengzhou University,
Zhengzhou 450002, China）
Abstract:Rapidly solidified ribbons of Ni25Al75 were prepared by planar flow casting. The microstructure of the ribbons was investigated by XRD, TEM and EDS. The results show that the peritectic reaction is restrained to great extent during continuous cooling in rapid solidification, which has an significant effect on solidification path. α(Al) occurs in the microstructure of the ribbon, which is impossible in equilibrium condition. The effective alloy concentration and growth velocity of NiAl3 phase are increased, which leads to the increase of the mass fraction of NiAl3 phase.
Key words: Ni-Al alloy;rapid solidification; peritectic reaction
