Microstructure Evolution During Roll Bonding and Growth of Interfacial Intermetallic Compounds in Al/Ti/Al Laminated Metal Composites
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Roll bonding is an effective method to fabricate dissimilar laminated metal composites (LMCs). Therefore, investigation of the microstructure evolution during the roll bonding process is very important to improve the bonding strength and optimize the roll bonding process. In this work, a rolling stuck test was executed to obtain the roll bonding deformation zone. The microstructure and interface morphology of an Al/Ti/Al LMC were investigated during the roll bonding process, and the growth of the diffusion intermetallic compounds was characterized for the annealed LMCs. The results show that the critical roll bonding reduction is greater than 20% for the fabrication of Al/Ti/Al LMCs. The change in the bonding interfacial morphology from straight to wavy is related to the uncoordinated deformation between the constituent layers. When annealing at 550°C, the kinetic exponent of about 0.5 for Al3Ti reveals that the diffusion mechanism obeyed the parabolic growth law in diffusion thickness.
The authors are grateful for financial support from the National Natural Science Foundation of China (No. 51421001), Fundamental Research Funds for the Central Universities (2019CDQYCL001, 2019CDCGCL204), and Research Project of State Key Laboratory of Vehicle NVH and Safety Technology (No. NVHSKL-201706).
Conflict of interest
The authors declare that they have no conflicts of interest.
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