喷射沉积Al-Fe-V-Si合金的组织演变研究(英文)

Study on the microstructure Evolution of Spray Deposited Al-Fe-V-Si Alloy

通过光学和透射电子显微镜研究了喷射沉积Al-Fe -V -Si合金在沉积态和不同温度热挤压后的显微组织 ,发现在α-Al基体上均匀分布着高密度的细小硅化物颗粒 ,这些细小硅化物颗粒在高温挤压后仍能保持较好的稳定性 ,在提高合金高温性能中起主要作用 .在 30 0℃及其以上温度的挤压态合金中发现了一些六边形块状相 ,经分析是由于合金局部元素成分波动造成V元素的缺乏促使亚稳α -AlFeSi相矢稳转变而成 。

Microstructure characterization of the as-received and hot-extruded spray deposited Al-8Fe-1.3V -1.7Si alloys were comprehensively done by optical and transmission electron microscopy. The results show that densely fine silicide particles uniformly distribute in the α -Al matrix and remain stable after hot extrusion at high temperature. Some h -Al 8Fe 2Si clump particles appear after hot extrusion at 300 ℃ and above, which was transformed from b.c.c α -Al 13 Fe 3Si phase. The mechanical properties of as-extruded alloys decrease as the extrusion temperature increases.