稀土元素对快凝 AlFeVSi 合金性能和组织的影响

来源期刊：中南大学学报(自然科学版)1998年第5期

论文作者：肖于德 黎文献 李松瑞 马正青

文章页码：66 - 70

关键词：快速凝固;耐热铝合金;稀土元素

Key words：rapid solidification; aluminum alloy; rare-earth elements

摘    要：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.

Abstract: Effect of adding rare-earth elements on tensile properties and microstructures of the as extruded bar of FVS0812 was investigated by means of tensile test, scanning electron microscope (SEM) and transmission electron microscope (TEM), and mechanism of the action of rare-earth elements in the AlFeVSi alloy system was analysed qualitatively by studying the mutual effect intensities between the rare-earth elements and component elements of the second phases. The results show that the adding of Er, Y into the AlFeVSi alloy will lead to coarsen lumpish phase δ(AlFeVSiEr) (hcp, a =12.7 A, c =26.8 A) and coarsen near spherical phase Al₂₀ (V,Fe)₂Y (cubic, a =14.8 A), and although there is not other phase forming, the adding of Ce into the alloy will obviously make the Al₁₂ (Fe,V)₃Si silicides fine and well-distributed, Thus it will be beneficial to ameliorating its microstructures and improving its properties of the rapidly solidified AlFeVSi alloy. Effect of rare earth elements on microstructures and properties of the rapidly solidified AlFeVSi alloy has relations with lattice structure, atomic radius and electron-egativity of the rare earth elements and component elements of the second phase.