Microstructure And Mechanical Properties Of Iron-Based Laminated Composites Fabricated By Ultrasonic Consolidation

According to the principle of bionics,laminated composites have various combinations of matrix phase and reinforcing phase and different materials and processing methods used in each layer,so that the types of laminated composite materials are rich and colorful and can be adapted to various industrial production.Laminated composite materials can be used not only as structural materials,but also to integrate unique physical and structural functional properties into structural materials with excellent mechanical properties,It can be used to obtain more promising structural and functional integrated materials which greatly expands the application field of laminated composites.Ultrasonic consolidation technology is a new method for realizing the integration of metal laminated structures by rapid consolidation forming and manufacturing in recent years,The special connection technology is realized by the initial development of ultrasonic metal welding spot welding,wire welding and other development techniques to achieve a dense consolidation between the faces.Due to the improvement of the theory of ultrasonic consolidation manufacturing technology,the interface of the same or different materials causes local temperature rise of the interface under the combined action of elastic vibration and static pressure by using the high-frequency vibration energy of ultrasonic waves,The interface between the layers is finally achieved.It has great potential for the preparation of a new generation of complex laminated composite parts and is also an advanced material and structural additive 3D printing technology.This paper is aimed at Al/Amorphous laminates,Al/Fe,Al/carbon steel laminated composite systems with low cost and multilayer structure,Firstly,through the designed L9?3⁴?orthogonal test,Al/amorphous laminated composites with excellent effect of strong layer and tough layer are obtained by different ultrasonic consolidation processes.X-ray diffraction and microhardness measurements indicated that the respective structure of the individual layers was preserved together with excellent hardness and stiffness of the amorphous layer.Shear bands in the amorphous strip combined with thermodynamic stability measurements by differential scanning calorimeter?DSC?indicated that the plastic deformation of amorphous layer led to coordinated deformation and mechanical bonding during the ultrasonic consolidation process.Then,Al/carbon steel and Al/Fe consolidated sample laminated composites of the interfacial bonding were studied by SEM and EDS.The hardness and tensile properties of Al/carbon steel and Al/Fe laminated composites were tested by mechanical properties.Finally,the fracture morphology of each interface was studied..The specific research work is as follows:?1?Designing the L₉?3⁴?orthogonal test of Al/amorphous laminate and combining the single variable method to determine the optimal process:substrate preheating temperature190°C,ultrasonic amplitude 20?m,head travel speed 20 mm/s,The positive pressure applied by the ultrasonic wave is 150 Kgf.?2?The interface is no step phenomenon by the EDS line scanning.The amorphous layer is not crystallized by XRD detection and there is only one diffraction spectrum of the diffuse scattering peak.The interface hardness of Al/amorphous laminated composites is gradient and the interface is no obvious crack at the tip of the hardness indentation.?3?Local softening of the aluminum layer at the interface and recrystallization of part of the aluminum,comparison of the DSC curves of the iron-based amorphous and consolidated samples confirmed that the iron-based amorphous material undergoes strong plastic deformation.The fracture of Al/amorphous laminated composite exhibits complex failure and the fracture form is brittle fracture+ductile fracture.?4?The interface of the Al/carbon steel laminated composite has a large unevenness,the aluminum layer has severe necking and occurs the fracture.The Al/Fe interface is relatively straight and produces trace amounts of intermetallic compounds at the interface.?5?The maximum tensile stress of Al/carbon steel and Al/Fe laminated composites is356.81 MPa and 263.13 MPa,respectively.The composite material after lamination consolidation has a much higher mechanical property than a single material.Fracture morphology analysis of Al/carbon steel and Al/Fe laminated composites found that the coordination of Al/carbon steel is not as good as that of Al/Fe laminated composites.