不同冷却速度下A1-5Fe、A1-5Fe-3Y合金组织和相组成
Microstructure and Phase Constitution of Al-5Fe and Al-5Fe-3Y Alloys at Different Cooling Speed
米国发， 董翠粉， 赵大为
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作者单位：（河南理工大学 材料科学与工程学院，河南 焦作 454000）
中文关键字： 冷却速度； 稀土Y； 组织； 相组成
英文关键字： cooling rate; rare earth Y; microstructure; phase constitution
中文摘要：分别采用熔炼、吸铸和单辊甩带法制备了铸态、亚快速凝固和快速凝固下的A1-5Fe合金和A1-5Fe-3Y合金，探讨了冷却速度的提高和稀土Y的添加对A1-5Fe合金的组织和相组成的影响。结果表明，稀土Y可以使A1-5Fe合金中Al3Fe相由针状转变为团球状并使快速凝固合金中出现了二次析出相。冷却速度的提高使合金的组织得到进一步细化，并使Al-5Fe和A1-5Fe-3Y合金中分别出现了亚稳相A16Fe和金属间化合物A110Fe2Y相。
英文摘要：Casting, sub-rapid solidified and rapidly solidified A1-5Fe alloy and A1-5Fe-3Y alloy were respectively prepared by vacuum melting furnace, suction casting and melt spinning furnace. The influence of increasing cooling rate and adding rare earth Y on microstructure and phase composition was analyzed. The results show that the acicular Al3Fe phase transfers to spherical phase and dispersed secondary precipitations are also found when Y is added in the Al-5Fe alloy. Meanwhile, the microstructure apparently refines by increasing cooling rate, the metastable phase A16Fe and intermetallic compound A110Fe2Y phase respectively appears in Al-5Fe alloy and A1-5Fe-3Y alloy.