Abstract
In this study, the traditional hot rolling to fabricate Al/Ti laminated metal composites (LMCs) was improved by using a pre-rolling diffusion process. The effect of the pre-rolling diffusion on microstructure and mechanical properties of Al/Ti LMCs were investigated by various methods, such as optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and tensile tests. The results show that, with increasing diffusion temperature, the thickness in diffusion layer was increased and the mechanical properties of LMCs were improved obviously, which was attributed to the optimized interfacial structure after diffusion process. In addition, the formation of TiAl3 intermetallic compounds (IMCs) was detected in the bonding interface, which played an important role in improving the mechanical properties for Al/Ti LMCs. The predicted results of stress-strain curves from rule of mixture (ROM) indicated that, there existed an extra interfacial strengthening in Al/Ti LMCs beside the mechanical properties provided by the contribution of constituent layers. The pre-rolling diffusion process is effective for the optimization of interfacial structure and improvement of mechanical properties in Al/Ti LMCs.
Highlights
With the development of science and technology, the requirements of metal material have become diversified and a single traditional metal material is difficult to satisfy the needs of industry
It can be seen that the ultimate tensile strength (UTS) of all pre-rolling diffusion processed samples are prominently high compared to the conventional sample
It can be concluded that the improved strength was attributed to the optimization of interfacial structure caused by pre-rolling diffusion process, i.e., increasing of thickness in laminated metal composites (LMCs)
Summary
With the development of science and technology, the requirements of metal material have become diversified and a single traditional metal material is difficult to satisfy the needs of industry. Reaction hot pressing [16,17] Among these methods, roll bonding was widely used in the fabrication of Al/Ti LMCs due to relatively simple equipment and processing. In order to bonding between constituent layers, a hot rolling with high rolling temperature must be applied in the fabrication of Al/Ti LMCs [18,19]. The oxides and inclusions caused byinhigh process of roll bonding will inevitably introduce hard and brittle oxides and other inclusions the temperature will result in the decreasing of mechanical properties, such as bonding strength and bonding interface of LMCs [19,20]. It is necessary to in the decreasing properties, suchofasconstituent bonding strength and toughness, due to the eliminate the effect of oxides or inclusions on the bonding interface in order to obtain a LMCs with deteriorative combination of constituent layers.
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