Study Of Roll-bonding Process And Properties Of Al/Ti/Al Laminated Composites

With the development of the technology and the appearance of various kinds of newtechnology and industry, materials with single property has been difficult to meet thehigher requirements, so more excellent materials are required. The research of theadvanced laminated metal composites has been a very important trend of the materialsresearch field. Laminated metal composites with physical and chemical properties ofdifferent materials can improve the short coming of many traditional materials, sonowadays the research of the laminated metal composites has been a very hot researchfield.In this study, Al/Ti/Al laminated composites were fabricated by hot roll. The effectsof rolling parameters on the properties of Al/Ti/Al composites were studied. Themechnical property, microstructure and texture were also discussed, by means of opticalmicroscope (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), energydispersive spectrometer (EDS), microhardness tester and so on.The results show that: Al/Ti/Al composites of this paper can be bonding by hotrolling with at least27%reduction. In all the deformation, the interface was straightness at300℃and500℃. But at400℃and500℃the deformation of the titanium plate wasnonuniform, so the interface was the upper side of down, and the necking down wasappeared in th interface with the increase of the reduction as well as the crack. The tensilestrength of the Al/Ti/Al composites was between196~226MPa, and the yield strengthwas between161~195MPa, in addition the mechnical property along the crosswise was alittle higher than along the rolling direction. With the increase of the temperature thetensile strength was decreased, but with the increase of the reduction the tensile strengthwas increased. There was a certain thickness diffusion layer in the interface, the thicknesswas about4.2~6.8μm, with the rise of the temperature and reduction the thickness of thediffusion layer was increased. As the rolling proceed, the main change of the texture of thealuminum was the Cube, C and R-Cube. As the temperature and the reduction rising, thestrength and the volume fraction of the Cube and C was decreased and the R-Cube wasincreased, the texture with the orientation of {011}<65|-5> was appeared in the interface layer. The main change of the Ti layer was the basal fiber {0001}<uvtw> and the{011|-3}<211|-0> texture, as the temperature rising the intensity of the {011|-3}<21|-1|-0>was increased but the basal fiber was first decreased and then increased; With the increaseof the reduction, the indensity of the {011|-3}<21|-1|-0> was reduced but the basal fiber wasincreased.