采用力学拉伸试验、透射电镜、扫描电镜等测试手段研究了稀土元素Ｅｒ，Ｙ，Ｃｅ对ＦＶＳ０８１２合金挤压棒材的力学性能和显微组织的影响，并通过考察稀土元素与合金组成元素之间的交互作用强度，定性地分析了稀土元素在快凝ＡｌＦｅＶＳｉ合金中的作用机理．结果表明，Ｅｒ促使粗大块状δ相的形成，加Ｙ则有较粗大的类球形第２相Ａｌ２０（Ｖ，Ｆｅ）２Ｙ的析出，而Ｃｅ没有生成其它相，但是明显细化了Ａｌ１２（Ｆｅ，Ｖ）３Ｓｉ硅化物质点，因此，采用Ｃｅ合金化可以改善合金显微组织，明显改善快凝ＡｌＦｅＶＳｉ合金力学性能．稀土元素对快凝ＡｌＦｅＶＳｉ合金组织性能以及第２相稳定性的影响主要与稀土元素晶体结构、原子半径、电负性等因素有关 The effects of rare earth elements Er, Y, Ce on the mechanical properties and microstructure of the extruded bar of FVS0812 alloy were investigated by mechanical tensile test, transmission electron microscopy and scanning electron microscopy. The effects of rare earth elements and alloy elements Interaction between the intensity of rare earth elements qualitative analysis of the rapid solidification AlFeVSi alloy mechanism. The results show that Er promotes the formation of coarse massive δ-phase, while Y has a coarser spheroidal Al20 (V, Fe) 2Y precipitates, while Ce does not form other phases, but obviously refines Al12 (Fe , V) 3Si silicide point, therefore, the use of Ce alloying can improve the microstructure of the alloy, significantly improve the mechanical properties of rapidly solidified AlFeVSi alloy. The effects of rare earth elements on the microstructure and phase stability of AlFeVSi alloy are mainly related to the crystal structure, atomic radius and electronegativity of rare earth elements