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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。
A1-5Fe and A1-5Fe-1.5La alloys were prepared by vacuum melting, suction casting and single roll rejection respectively. The effects of cooling rate and rare earth La on the mechanical properties of A1-5Fe alloy The impact of organization and phase composition. The microstructure and phase composition of the alloy were analyzed by OM, TEM and XRD. The results show that the microstructure of the alloy is further refined by the increase of the cooling rate. When 1.5wt% La is added, the Al3Fe phase in the as-cast iron-rich phase is transformed into a flower-like shape and the matrix of Al-5Fe solidified rapidly . At the same time, metastable phase Al6Fe and Al11La3 phase with high melting point appeared in the alloy.