Abstract
A laminated Ti-Al composite has been fabricated by hot compaction and hot rolling of alternate layers of commercial purity Ti and Al sheets with a thickness of 200 μm. The hot compaction temperature was 500°C and in a following step the composite has been reduced 50% in thickness by hot rolling. The fully consolidated composite has been annealed at 300°C and 500°C for different length of time. As a result of the differences in crystal structure and mechanical properties between Ti and Al protrusions and retrusions formed at the interface. A heterogeneous interface has thereby been created. The heterogeneity affected the recovery kinetics of the aluminium phase which at 300°C was faster near the interface than in the middle of the Al layer. This effect of a heterogeneous interface is of relevance when optimizing the thermomechanical processing of the composite to obtain high strength and formability for application.
Highlights
Efforts have been and would continue to be made in order to develop strong and light metals in response to the energy shortage
The sandwich was put into a graphite die for confinement and pressed under a pressure of 40 MPa at 500 ̊C for 1 h in a vacuum furnace to obtain laminated metal composites (LMCs). iii) Hot rolling: the compressed LMCs were held at 500 ̊C for 10 minutes before each rolling pass and rolled through 5 passes with a total thickness reduction of 50% from 6 mm to 3 mm
Microstructure of deformed laminated Ti-Al composite The microstructure of the LMCs before and after hot rolling were examined by SEM as shown in figure 2(a) and figure 2(b)
Summary
Efforts have been and would continue to be made in order to develop strong and light metals in response to the energy shortage. The interface plays an important role in LMCs and has been studied in recent years for example in roll bonded composites. In such studies experimental observations have been analyzed including numerical simulation of evolving interfaces [3,4,5]. It has been observed that roughness can form during deformation of polycrystalline metallic materials with FCC structure or HCP structure due to heterogeneity of plastic deformation [7,8,9] This phenomenon has been observed at the interfaces of LMCs produced by rolling [4] and this kind of heterogeneity can cause structural differences during annealing of the LMC.
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