(1. 湘潭大学 机械工程学院， 湘潭 411105;
2. 中南大学 材料科学与工程系，长沙 410083)
摘 要: 研究了熔体过热、加冷料搅拌及冷却速度对2618合金中Al9FeNi相形态的影响。结果表明，与2618合金熔体720 ℃正常熔炼浇注相比，熔体960 ℃过热处理可得到更加细小均匀的针片状Al9FeNi相，特别是880 ℃过热加纯铝锭冷料搅拌处理可得到长度约4 μm的细小颗粒状Al9FeNi相，而合金熔体在720 ℃过热后缓慢冷却导致Al9FeNi相的初晶偏析。
关键字: 熔铸工艺； 2618合金； Al99FeNi相形态
Al9FeNi phase in 2618 alloy
（1. Institute of Mechanical Engineering, Xiangtan University，
Xiangtan 411105， P.R.China;
2. Department of Materials Science and Engineering,
Central South University， Changsha 410083， P.R.China）
Abstract:The effects of melt overheating， meltstirring after adding cold metalas well as cooling rate of liquid metal on the morphology of Al9FeNi phase in 2618 alloy have been investigated．The results show that melt over-heating treatment at 960 ℃ leads to finer and better-distributed needle-like Al9FeNi phase comparing with normal casting process at 720 ℃； the grain size of Al9FeNi phase is about 4 μm in length, which could be obtained by over-heating the liquid 2618 alloy at 880℃ and melt-stirring after adding cold aluminum block； and small solidification rate after over-heating at 720 ℃ leads to the formation of primary Al9FeNi phase．
Key words: casting process； 2618 alloy； morphology of Al9FeNi phase
