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Microstructural Evolution and Growth Behavior of In Situ TiB Whisker Array in ZrB 2 – SiC /Ti6Al4V Brazing Joints
Author(s) -
Yang Weiqi,
Lin Tiesong,
He Peng,
Zhu Ming,
Song Changbao,
Jia Dechang,
Feng Jicai
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12629
Subject(s) - whisker , whiskers , materials science , eutectic system , ceramic , alloy , in situ , composite material , shear strength (soil) , brazing , microstructure , metallurgy , chemistry , organic chemistry , environmental science , soil science , soil water
An in situ short fiber reinforced brazing technique by taking advantage of reaction between ZrB 2 and Ti has been developed for joining ZrB 2 – SiC ceramic and Ti6Al4V alloy. The Ag – Cu eutectic alloy was used as brazing interlayer to realize controllable growth of TiB in Ti ‐rich environment. The microstructural evolution of the joint was divided into four stages as experiments performed from 840°C to 920°C. The diffusion behaviors of Ti and B may play an important role on the preferential growth of TiB whiskers during brazing. The statistics of the length of TiB showed that a rapid growth appeared at 880°C. The accommodation to the coefficients of thermal expansion by TiB whiskers was evaluated and the shear strength of the joints was tested.