Simulation of Zr content in TiZrCuNi brazing filler metal for Ti6Al4V alloy
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Simulation of Zr content in TiZrCuNi brazing filler metal for Ti6Al4V alloy Xishan Yue1,2 • Zonghong Xie1 • Yongjuan Jing2
Received: 18 February 2017 / Accepted: 30 May 2017 / Published online: 17 June 2017 Springer-Verlag Berlin Heidelberg 2017
Abstract To optimize the Zr content in Ti-based filler metal, the covalent electron on the nearest atoms bond in unit cell (nu–v A ) with Ti-based BCC structure was calculated, in which the brazing temperature was considered due to its influence on the lattice parameter. Based on EET theory (The Empirical Electron Theory for solid and molecules), nuv represents the strength of the unit cell A with defined element composition and structure, which reflects the effect from solid solution strengthening on the strength of the unit cell. For Ti–Zr–15Cu–10Ni wt% filler metal, it kept constant as 0.3476 with Zr as 37.5*45 wt% and decreased to 0.333 with Zr decreasing from 37.5 to 25 wt%. Finally, it increased up to 0.3406 with Zr as 2*10 wt%. Thus, Ti-based filler metal with Zr content being 2*10 wt% is suggested based on the simulation results. Moreover, the calculated covalent electron of nu–v A showed good agreement with the hardness of the joint by filler 37.5Zr and 10Zr. The composition of Ti–10Zr–15Cu– 10Ni wt% was verified in this study with higher tensile strength of the brazing joint and uniform microstructure of the interface.
& Xishan Yue [email protected] 1
School of Astronautics, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China
2
Aeronautical Key Laboratory for Welding and Joining Technology, AVIC Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, People’s Republic of China
1 Introduction Brazing technology has found extensive use for production of components in biomedical and aerospace applications [1, 2]. In the brazing technology, BFMs (brazing filler metals) have been recognized as the most important factor for the excellent mechanical properties of the joint [3–5].For Ti-based alloys which has widely been used in aerospace industry, many Ti-based BFMs have been designed for providing better strength and corrosion resistance compared with Al-based and Ag-based BFM [6–9]. Most of the research has focused on optimization of the Ti-based BFMs and the brazing process (as brazing temperature and holding time); however, it costs much expense on experiments. Based on the examination of the element distribution near the joint, the solid strengthening effect from the filler elements on the joint has been proposed [10]. In addition, the element distribution was influenced not only by the brazing process, but also by the filler composition. Hence, the simulation of the strength of the filler alloy can be one of the methods to predict the strength of the joint. Besides, the mechanism for the higher strength of the joint has been a big concern, even though some reports published the joint strength as much as that of the matrix [9, 11, 12]. Moreover, reduction of Zr content within the Ti-based filler material
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