Effect of Ni interlayer on diffusion bonding of a W alloy and a Ta alloy

Jian Zhang; Ruxia Liu; Qinqin Wei; Guoqiang Luo; Qiang Shen; Lianmeng Zhang

doi:10.3139/120.111066

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Effect of Ni interlayer on diffusion bonding of a W alloy and a Ta alloy

Jian Zhang , Ruxia Liu , Qinqin Wei , Guoqiang Luo , Qiang Shen und Lianmeng Zhang

Veröffentlicht/Copyright: 28. August 2017

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Abstract

The combination of W and Ta is expected to be highly beneficial for many applications from aerospace, weapons, military and nuclear industry. In this paper, W and Ta alloys were successfully diffusion bonded with Ni interlayer. The process of the formation of W/Ni/Ta diffusion bonded joints was investigated by means of scanning electron microscopy, X-ray diffraction system, electron probe micro-analyzer, energy dispersive spectrometry and shear strength measurement. The results show that the shear strength increases when the bonding temperature increases and exhibits a maximum value of 244 MPa at 930 °C. The bonding of W/Ni can be attributed to the bonding of Ni to tungsten grains and the bonding of Ni to a Ni-Fe-binder mainly by elemental diffusion. The fracture takes place in the Ni/Ta interface and Ni₃Ta and Ni₂Ta intermetallic compounds are formed on the fracture surfaces.

Kurzfassung

Die Kombination von Wolfram und Tantal ist erwartungsgemäß sehr vorteilhaft für viele Anwendungen in der Raumfahrt, für Waffen sowie für die Militär- und Nuklearindustrie. In der diesem Beitrag zugrundeliegenden Studie wurden Wolfram- und Tantal-Legierungen erfolgreich mit einer Nickel-Zwischenlage verbunden. Der Ausbildungsprozess der W/Ni/Ta-Diffusionsverbindungen wurde mittels Rasterelektronenmikroskopie, Röntgendiffraktometrie, Elektronenprobenmikroanalysator, energiedispersiver Spektrometrie und Scherfestigkeitsmessungen untersucht. Die Ergebnisse zeigen, dass die Scherfestigkeit ansteigt, wenn die Temperatur beim Diffusionsbonden erhöht wird und erreicht einen maximalen Wert von 244 MPa bei 930 °C. Die Verbindung W/Ni kann auf eine Bindung von Nickel an Wolframkörner zurückgeführt werden und die Bindung von Nickel zum Ni-Fe-Binder entsprechend auf elementare Diffusion. Der Bruch bildet sich in der Ni/Ta Zwischenschicht und es werden die intermetallischen Verbindungen Ni₃Ta und Ni₂Ta auf den Bruchoberflächen gebildet.

*Correspondence Address, Prof. Dr. Jian Zhang, The State Key Laboratory of Advanced Technology, for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China, E-mail: zhangjian178@whut.edu.cn

Assoc. Prof. Jian Zhang, born in 1984, is Associate Professor at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology. His research field includes diffusion bonding and metal materials.

Ruxia Liu, born in 1991, is a doctoral student in the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, China. She received her Master's degree in Materials Science and Engineering in 2013. Her research interest is metal matrix composites.

Qinqin Wei, is a doctoral student in the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, China. She received her Master's degree in Materials Science and Engineering in 2010. Her research interest is diffusion bonding of dissimilar materials.

Prof. Guoqiang Luo is Professor at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, China. His research field includes diffusion bonding and metal materials.

Prof. Qiang Shen has been Professor at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, China. His areas of expertise include corrosion of metals and alloys, welding and metal joining, stainless steels and high temperature materials.

Prof. Lianmeng Zhang is Professor at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology, China. He has been Vice-President of Wuhan University of Technology since 2000. His areas of expertise include corrosion of metals and alloys, welding and metal joining.

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Published Online: 2017-08-28

Published in Print: 2017-09-01

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https://doi.org/10.3139/120.111066