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Jiujian Xu,Guangming Xu,Yong Li,Zhaodong Wang 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.10
In this study, a Ti/Al clad sheet was fabricated using horizontal twin-roll casting (HTRC) with the application of pulsedelectric field (PEF) and electromagnetic oscillation field (EOF), and the effects of different external fields on interfacialbonding strength were investigated in detail. The external electromagnetic fields have little influence on the stability of HTRCprocess. With the application of PEF and EOF, the width of diffusion layer at the Ti/Al interface increases obviously, andthe interfacial bonding strength increases from 20.1 to 21.4 N/mm and 24.5 N/mm, respectively. When the EOF is applied,the electromagnetic volumetric force is generated in the liquid cavity of cast-rolling zone, which is much larger than theelectromagnetic force caused by single PEF. Under the action of the electromagnetic volume force, aluminum melt in theliquid cavity oscillates repeatedly, which scours the surface of the titanium strip and makes the newly formed crystal nucleifall off the surface of strip. In addition, the oscillation effect reduces the temperature gradient at the contact area betweenstrip and melt and slows down the solidification process, thus prolonging the contact time between aluminum and titanium. All of these effects make the melt spread more sufficient on the surface of titanium strip and promote the interdiffusionbetween atoms. As a result, more metallurgical bonding regions are formed and enhanced, which leads to the improvementof bonding strength of the clad sheet.
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