稀土La和冷却速度对A1-5Fe合金组织和相组成的影响
Effect of Rare Earth La and Cooling Speed on Microstructure and Phase Constitution of Al-5Fe Alloy
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La； 组织； 相组成
英文关键字：cooling rate; rare earth La; microstructure; phase composition
中文摘要：分别采用真空熔炼、 吸铸和单辊甩带法制备了铸态、 亚快速凝固和快速凝固状态下A1-5Fe和A1-5Fe-
1.5La合金， 探讨了冷却速度和稀土La对A1-5Fe合金组织和相组成的影响。 通过OM、TEM和XRD对合金组织和相组成进行分析。结果表明， 冷却速度的提高使合金的组织得到进一步细化；添加1.5wt%La后，铸态合金中针状富铁相Al3Fe转变为花朵状， 并使亚快速凝固Al-5Fe的基体发生变化。同时， 在合金中出现了亚稳相Al6Fe和具有高熔点的Al11La3相。
英文摘要：The as-cast, sub-rapid solidified and rapidly solidified A1-5Fe alloys with or without rare earth La were respectively prepared by vacuum melting furnace, suction casting and melt spinning furnace. And the alloys were investigated by OM, TEM and XRD. The results show that the microstructure is apparently refined with the increase of cooling rate. Meanwhile, the acicular Al3Fe phase is transformed into flower-like phase in as-cast A1-5Fe alloy, and the matrix morphology of the alloy is also changed in sub-rapidly solidified Al-5Fe alloy, while 1.5wt%La is added. The metastable phase Al6Fe and Al11La3 phase with high melting point are found in Al-5Fe alloy and A1-5Fe-1.5La alloy.