Characteristics of High Nb Containing TiAl Alloyed Powders by Radio Frequency Plasma Processing

LU Xin; WANG Shu-chao; ZHU Lang-ping; HE Xin-bo; HAO Jun-jie; QU Xuan-hui

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Journal of Aeronautical Materials ›› 2011, Vol. 31 ›› Issue (4) : 1-6.

Characteristics of High Nb Containing TiAl Alloyed Powders by Radio Frequency Plasma Processing

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Abstract

Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y(at%) ingot was prepared using a vacuum induction furnace,and then machined with a crusher in argon atmosphere.Subsequently,microfine spherical high Nb containing TiAl alloyed powders were obtained by fluidized bed jet milling in inert gas and then by radio frequency argon plasma.The fabrication process and characteristics of the powders were investigated.The results show that the powders fabricated by this process is highly refined and spheroidized,and the particle size is accurately controlled in a small interval.The plasma-spheroidized powders are dominated by α2-Ti3Al with a minor amount of β-Ti2AlNb.The oxygen content becomes higher gradually with the decrease of the particle size.The exterior and interior microstructures of the alloyed powders strongly depend on the particle size.The powders with an average particle size of 90μm show dendritic microstructure,and network Al-rich phase segregation exists within the particles.With the particle size decreasing,the surface of the powders tends to be smooth,and the internal segregation is gradually weakened.In addition,the 90μm powders possess high composition homogeneity,and with the decrease of the particle size the composition homogeneity declines gradually.

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high Nb containing T / spherical powder / radio frequency plas / powder characteristi

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LU Xin, WANG Shu-chao, ZHU Lang-ping, HE Xin-bo, HAO Jun-jie, QU Xuan-hui. Characteristics of High Nb Containing TiAl Alloyed Powders by Radio Frequency Plasma Processing[J]. Journal of Aeronautical Materials, 2011, 31(4): 1-6

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