Formation and evolution of precipitate in TiAl alloy with addition of interstitial carbon atom

Huan Zhou, Tiebang Zhang, Zeen Wu, Rui Hu, Hongchao Kou, Jinshan Li

科研成果: 期刊稿件文章同行评审

3 引用 (Scopus)

摘要

As promising light-weight high-temperature materials, γ-TiAl base alloys are considered as prospective candidates for automobile and aerospace application due to their high specific yield strength. Adding Nb to TiAl alloys increases the liquidus temperature and results in improvents of creep resistance, high temperature strength and oxidation resistance. High Nb-containing TiAl alloys have attracted much attention during past decades. With the addition of carbon in Ti-46Al-8Nb-xC alloys (x=0, 0.7, 1.4, 2.5, atomic fraction, %), the formation of precipitates, the orientation relationship between precipitates and the TiAl matrix and the evolution of the precipitates during heat treatments have been investigated in this work by XRD, SEM and TEM. The results show that lath-shaped precipitates of Ti2AlC can be formed during the preparation of ingots with the addition of 1.4% and 2.5% of C. With good thermal stability, the size, amount and distribution of Ti2AlC precipitates remain almost stable during the aging process. Needle-shaped precipitates of Ti3AlC are formed in the aged alloys with 0.7%, 1.4% and 2.5% of C. And the precipitates are preferentially formed in g grains. The orientation relationship between Ti3AlC precipitates and g phase is found to be {100}Ti3AlC //{100}γ and <001>Ti3AlC//<001>γ. Meanwhile, the pre-cipitation behavior and morphology of Ti3AlC are also discussed. Ti3AlC precipitates grow slightly after prolonged aging, while the amount of the precipitates remains small. With a higher aging temperature, the size of Ti3AlC precipitates increases significantly and an increasing amount of the precipitates is observed.

源语言英语
页(从-至)832-838
页数7
期刊Jinshu Xuebao/Acta Metallurgica Sinica
50
7
DOI
出版状态已出版 - 11 7月 2014

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