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YANG Zhenwen, ZHANG Lixia, XUE Qing, HE Peng. Microstructure of TiAl joints brazed with TiNiB high-temperature filler metal[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2012, (4): 49-52.
Citation: YANG Zhenwen, ZHANG Lixia, XUE Qing, HE Peng. Microstructure of TiAl joints brazed with TiNiB high-temperature filler metal[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2012, (4): 49-52.
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Microstructure of TiAl joints brazed with TiNiB high-temperature filler metal

  • State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

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  • Received Date: March 09, 2011
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  • High-temperature filler metal of TiNiB prepared by arc melting was used as an active filler metal in vacuum brazing of TiAl alloy.The effect of brazing temperature on the microstructure evolution of the joints was studied in this paper.The TiNiB filler metal was mainly comprised of TiNi and TiNi3 eutectic microstructure,in which some TiB2 blocks appeared.The melting point of the filler metal was 1 120℃.The dissolution of TiAl substrate has a strong effect on interfacial structure.The TiAl alloy adjacent to brazed seam was transformed to β layer with the dissolution of TiAl substrate.The microstructure of the brazed seam was comprised of Ti-Al-Ni compounds and a little β phase.TiB2 was transformed to TiB due to the reaction with Ti.
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