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Wettability of TiZrNiCu-B/Ti60 system and its brazing to TiBw-TC4 composite
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1.State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology;2.Shandong Provincial Key Lab of Special Welding Technology,Harbin Institute of Technology at Weihai;3.Department of Chemistry,Harbin Institute of Technology

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Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    Abstract:

    In this work, the connection between the boron content and the wettability of TiZrNiCu/Ti60 system was studied by sessile drop method of elevating and maintaining isothermal process under vacuum, and TiBw-TC4 composite was successfully brazed to Ti60 alloy using TiZrNiCu-B filler alloy with brazing temperature of 940 °C for 10 min. The contact angle of TiZrNiCu/Ti60 alloy substrate and the corresponding interfacial microstructure, the interfacial microstructures and shear fractures of brazed joints were studied using SEM, EDS and XRD, and the influence of B content on interfacial microstructure and joining properties was also investigated in detail. Added B element can react with Ti to in-situ synthesizing TiB whiskers (TiBw), which resulted in a relative refinement of microstructure. And the maximum shear strength of TiBw-TC4/TiZrNiCu-B/Ti60 joint was 177 MPa when the content of B is 0.3 wt.%, which was 65% higher than the joints brazed without B content. However, the excessive B content worsened the wetting behavior of TiZrNiCu-B on Ti60 alloy substrate, resulted in the microvoids and disconnected area in the brazed joint, and the shear strength decreased inevitably.

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[S. P. Hu, Z. B. Chen, Y. Z. Lei, X. G. Song, J. R. Kang, J. Cao, D. Y. Tang. Wettability of TiZrNiCu-B/Ti60 system and its brazing to TiBw-TC4 composite[J]. Rare Metal Materials and Engineering,2019,48(3):701~710.]
DOI:10.12442/j. issn.1002-185X.20170898

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History
  • Received:October 09,2017
  • Revised:October 27,2017
  • Adopted:November 08,2017
  • Online: April 10,2019
  • Published: