Abstract
In this work, accumulative pack-roll bonding successfully manufactured the Ni/Ti/Nb multilayer composite. The microstructure evolution and mechanical properties of the composite during the accumulative roll bonding (ARB) process were investigated by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM), micro-hardness test, and tensile tests. The results showed that the deformation of each layer was relatively uniform in the initial stage of the ARB process. After the fourth pass, the Ni/Ti interface was still relatively straight, while the Ti/Nb interface was unevenly deformed. After the fourth pass, the microstructure of the Ni layer was equiaxed grains with a decreased grain size of 200 nm, and finer equiaxed grains were observed at the interface. No dynamic recrystallization occurred in the Ti and Nb layers. The laminar structure of the Nb layer was observed, and the grains were oriented parallel to the rolling direction. Moreover, the tensile strength and micro-hardness significantly increased as the number of ARB increased. After five passes of the ARB process, the tensile strength of the composite reached 792.3 MPa, and the micro-hardness of Ni, Ti, and Nb were increased to 270.2, 307.4, and 243.4 HV, respectively.
Highlights
Metal multilayer composites generally consist of two or more different metals, which combine the physical properties, chemical properties, and mechanical properties of different metals in order to improve the overall performance of composites [1,2]
Accumulative roll bonding (ARB) is a kind of severe plastic deformation (SPD) technology, which was first proposed by Saito in 1998 and used for preparing ultrafine grain sheets [6]
For the tri-metal composite, Al with low hardness and good deformability is generally used as the matrix, which is beneficial to the interface bonding in the accumulative roll bonding (ARB) process
Summary
Metal multilayer composites generally consist of two or more different metals, which combine the physical properties, chemical properties, and mechanical properties of different metals in order to improve the overall performance of composites [1,2]. When compared with several other methods, the roll bonding technology has superiorities, such as simple processes, low cost, and composites can be produced efficiently in large quantities It has become the major approach for preparing metal composite materials. For the tri-metal composite, Al with low hardness and good deformability is generally used as the matrix, which is beneficial to the interface bonding in the ARB process. The pack-roll bonding mainly stacks the metal sheets into a pack and performs vacuum sealing treatment to prevent the oxidation of the metal surfaces during the hot rolling process. It can enhance the interface bonding strength and improves the mechanical properties of composites. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Energy Dispersive Spectrometer (EDS), micro-hardness tests, and tensile tests have been utilized to investigate the microstructure evolution, the interface diffusion, and the mechanical properties
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