Dissimilar Metal Joining of Ti and Ni Using Ti-Al Powder Interlayer Via Rapid Thermal Explosion Method
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Dissimilar Metal Joining of Ti and Ni Using Ti-Al Powder Interlayer Via Rapid Thermal Explosion Method Changcheng Sang, Xiaoping Cai, Lu Zhu, Xuanru Ren, Gao Niu, Xiaohong Wang, and Peizhong Feng Submitted: 12 June 2020 / Revised: 8 September 2020 / Accepted: 10 October 2020 To achieve the low energy consumption and high strength joining between Ti and Ni, a novel joining method (rapid thermal explosion, TE) was developed for joining dissimilar metals using Ti-Al mixture powders as flux. The TE reaction temperature of Ti-Al flux was measured, and the microstructure and mechanical properties of Ti/Ni joint were investigated. The results reveal that the combustion temperature of the Ti-Al powder interlayer is 1103 °C, which is higher than the joining temperature, and an obvious self-exothermic phenomenon lasts 20 s. The intermetallic compound diffusion layers formed at both interfaces mainly owing to the diffusion of Al and the growth activation energy of diffusion layers near both interfaces are 79.68 kJ/mol and 38.26 kJ/mol, respectively. Based on the sheer strength and diffusion layer, the formation mechanism of Ti/Ni joints is metallurgical bonding through atomic diffusion and formation of the diffusion layer. Keywords
joint strength, microstructure, powder interlayer, thermal explosion
1. Introduction Titanium and its alloys have received a wide range of attention owing to their significant performances, such as high specific strength, superior corrosion resistance and fracture toughness (Ref 1). To extend their applications in aerospace, nuclear and chemical industries, joining of titanium and other metals, such as nickel metal, should be carried out (Ref 2). Joining of titanium and nickel has extensive application prospect in aviation and space industries due to their lightweight and excellent mechanical properties (Ref 3, 4). For instance, Ti/Ni multilayer composite was fabricated to be applied in the electrolytic bath intended for the production of chlorine (Ref 5). Recently, numerous methods have been applied to joining dissimilar metals, such as friction stir lap welding, diffusion joining and metallic bump-assisted weld bonding (Ref 6-9). Zhao et al. (Ref 6) have investigated the joining mechanism and mechanical properties of Al/steel joined by a novel metallic bump-assisted weld bonding and found that compared with the traditional resistance spot weld bonding (RSWB) process, the MBaWB welds achieved larger Al nugget, fewer defects and Changcheng Sang, Xuanru Ren, Xiaohong Wang, and Peizhong Feng, School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, PeopleÕs Republic of China; Xiaoping Cai and Lu Zhu, School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, PeopleÕs Republic of China; and School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, PeopleÕs Republic of China; Gao Niu, Research Center of Laser Fusion, China Academy of Enginee
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