(1. 湘潭大學(xué) 機(jī)械工程學(xué)院， 湘潭 411105;
2. 中南大學(xué) 材料科學(xué)與工程系，長沙 410083)
摘 要: 研究了熔體過熱、加冷料攪拌及冷卻速度對2618合金中Al9FeNi相形態(tài)的影響。結(jié)果表明，與2618合金熔體720 ℃正常熔煉澆注相比，熔體960 ℃過熱處理可得到更加細(xì)小均勻的針片狀A(yù)l9FeNi相，特別是880 ℃過熱加純鋁錠冷料攪拌處理可得到長度約4 μm的細(xì)小顆粒狀A(yù)l9FeNi相，而合金熔體在720 ℃過熱后緩慢冷卻導(dǎo)致Al9FeNi相的初晶偏析。
關(guān)鍵字: 熔鑄工藝； 2618合金； Al99FeNi相形態(tài)
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
