Abstract：The nominal composition of Ti-45Al-8Nb-xY(x=0,0.1,0.3,atom fraction/%) alloys was prepared by the non-pole-consuming vacuum arc furnace. The effect of Y addition and different homogenization treatments on the microstructure of the TiAl-based alloys with high Nb content was investigated by using the optical microscope (OM), scanning electronic microscope (SEM), X-ray diffraction (XRD), energy dispersive spectroscope (EDS). The results show that (α2+γ) lamellar colonies are refined by the element Y and the refining effect is improved with the increase of Y addition. The Y distributes along the grain boundaries and internal of lamellar colonies in the form of Y2O3 and YAl2 particles. The increase of phase transformation temperature Tα caused by the Y addition results in different microstructures formed in the TiAl-based alloys with high Nb content on the same homogenization process.
王艳晶, 柳乐, 宋玫锦. Y微合金化高铌TiAl基合金微观组织研究[J]. 材料工程, 2015, 43(1): 66-71.
WANG Yan-jing, LIU Le, SONG Mei-jin. Microstructure of Y Micro-alloying TiAl Based Alloy with High Nb Content. Journal of Materials Engineering, 2015, 43(1): 66-71.
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