MATEC Web Conf.
Volume 321, 2020The 14th World Conference on Titanium (Ti 2019)
|Number of page(s)||6|
|Section||Intermetallics and MMCs|
|Published online||12 October 2020|
Effect of Mo, V and Zr on the microstructure and mechanical properties of Ti2AlNb alloys
1 Western Superconducting Technologies Co., Ltd, Xi’an, 710018, China
2 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Small button ingots of Ti2AlNb alloys with different contents of Mo, V and Zr were melted by vacuum non-consumable arc furnace. Due to the rapid cooling rate during melting process, only β grains without precipitation were observed in most of the button ingots and no regular phenomenon was found. However, when the samples were heated to β phase region and then furnace cooled to room temperate, different morphologies and quantities of primary α phase and second O phase formed from the β grains of different samples. It is suggested that the morphology of α phase was changed from lamellar to quadrilateral with increasing V and the lath O increased with increasing Zr. Besides, the residual β/B2 phase increased with increasing Mo and V. The EDS results showed that Al and Zr were enriched in α phase whereas Nb, Mo and V were enriched in β/B2 phase. The micro-hardness of these samples before and after heat treatment was detected and the micro-hardness increased with increasing Zr and decreasing Mo and V.
Key words: Ti2AlNb alloys / heat treatment / microstructure / hardness
© The Authors, published by EDP Sciences, 2020
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