Microstructure and Mechanical Properties of Ti/Al/Ti Laminated Composites Prepared by Hot Rolling
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JMEPEG DOI: 10.1007/s11665-017-2769-5
Microstructure and Mechanical Properties of Ti/Al/Ti Laminated Composites Prepared by Hot Rolling M. Ma, X. Meng, and W.C. Liu (Submitted December 21, 2015; in revised form April 10, 2017) Ti-6Al-4V/Al 3003/Ti-6Al-4V laminated composites were fabricated by hot roll bonding. The microstructure and mechanical properties of the Ti/Al/Ti laminated composites were investigated. The Ti/Al/Ti laminated composites exhibited a good Ti/Al interfacial bonding with straight interface. The development of microstructure through the thickness of Al layer was inhomogeneous. The initial grains in the region near the interface of Al/Ti were markedly fragmented into equiaxed fine grains, whereas the grains in the center of Al layer were markedly elongated along the rolling direction. The inhomogeneity of deformation through the thickness of Al layer can be attributed to the effect of the uncoordinated deformation between Al and Ti layers and the inhomogeneity of initial microstructure. For the Ti/Al/Ti laminated composites fabricated with approximately 37% reduction, the UTS and YS increased with increasing rolling temperature, while the EL increased slightly. For the Ti/Al/Ti laminated composites fabricated at 400 °C, the UTS and YS increased significantly with increasing rolling reduction, whereas the EL decreased. The bonding strength increased with increasing rolling temperature and reduction. Keywords
laminated composites, mechanical microstructure, roll bonding
properties,
1. Introduction Laminated metal composites have gained extensive attention because of their improved fracture toughness, bending behavior, impact behavior, corrosion, wear and damping capacity (Ref 1, 2). Numerous techniques have been used for manufacturing laminated metal composites, such as explosive welding, roll bonding, diffusion bonding, extrusion and friction-stir welding. Roll bonding has been extensively investigated because of its efficiency and economy. So far, roll bonding has been successfully applied to produce laminated metal composites, including Cu/Nb (Ref 3), steel/steel (Ref 4), Ti/Al (Ref 5-7), Al/Al (Ref 8), Ag/Cu (Ref 9), Ag/Fe (Ref 10), Al/ steel (Ref 11), Al/Cu (Ref 12-14), Al/Zn (Ref 15), Cu/Cu (Ref 2, 16) and Al/Mg (Ref 17). The Ti/Al laminated composites have great potential for industrial applications due to their excellent mechanical properties combined with low density. In addition, the Ti/Al system is economically more attractive than monolithic titanium by the joining of relatively inexpensive aluminum. Most of previous researches concerning laminated metal composites are focused on the effects of processing parameters on the bond strength and mechanical properties. It was reported that the bond strength of laminated composite increased with increasing surface roughness (Ref 16, 18), rolling reduction M. Ma, X. Meng, and W.C. Liu, Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, PeopleÕs Rep
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