原位自生TiC颗粒对Al8.5Fe1.4V1.7Si耐热铝合金的组织及性能的影响

Effects of In-situ TiC Particles on the Microstructures and Mechanical Properties of Al8.5Fe1.4V1.7Si Aluminum Alloy

利用原位自生技术向Al8.5Fe1.4V1.7Si耐热铝合金中添加一定数量的TiC颗粒,利用金相、X-射线以及透射电镜等手段,分析了材料的组织结构特点,研究了原位TiC粒子对材料的组织结构的影响规律,并测试了材料的力学性能。研究结果表明:原位TiC粒子可以有效地抑制合金中粗大相的产生,促进球状Al12(Fe,V)3Si相的形成;通过添加原位TiC粒子,可以将材料的力学性能提高10%左右,而材料塑性变化不大。

Al8.5Fe1.4V1.7Si alloy, namely 8009 heat-resistant aluminum alloy, with a certain content of in-situ TiC particles was prepared by spray forming process. The microstructures and mechanical properties of this kind of alloy have been studied by Optical Microscope （OM）, X-ray diffraction （XRD）, Transmission Electron Microscope（TEM） and tensile test machine. The analysis results show that the coarse phases in the Al8.5Fe1.4V1.7Si alloy could be restrained by in-situ TiC particles and the spherical Al12 （Fe, V）3 Si phase in the 8009 alloy with in-situ TiC particles tends to precipitate more easily than that of the Al8.5Fe1.4V1.7Si alloy without in-situ TiC particles. The mechanical properties of the Al8.5Fe1.4V1.7Si alloy enhanced by in-situ TiC particles increased about 10% than that of the alloy without TiC. However, the in-situ TiC particles can not improve the elongation of the Al8.5Fe1.4V1.7Si alloy obviously.