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Effects of Sinusoidal Vibration of Crystallization Roller on Microstructure and Mechanical Properties of Ti/Al Laminated Composites by Twin-Roll Casting

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Abstract

A new vibration cast-rolling technology of “electromagnetic stirring + dendrite breaking + asynchronous rolling” was proposed with the adoption of sinusoidal vibration of crystallization roller to prepare Ti/Al laminated composites, and the effects of sinusoidal vibration of crystallization roller on microstructure evolution and mechanical properties were investigated in detail. It is indicated by the microstructure of fracture that the shear dimples surrounded by irregular torn edges in traditional cast-rolling eventually evolve into regular equiaxed dimples with honeycomb network formed by resisting shear deformation during tensile deformation. It is shown in the tensile tests that the yield strength (83.74 MPa) of cast-rolling materials with strong vibration of crystallization roller (amplitude 0.87 mm, vibration frequency 25 Hz) increased by 19% compared with that of traditional cast-rolling materials (70.41 MPa), the elongation (58.36%) decreased by 9% than that of traditional cast-rolling materials (64.34%). This is because the vibration promotes the crystal grain refinement, which leads to the increasing number of crystal grains and dislocation density. The higher the stress that needs to overcome the continuous deformation after strengthening, the more difficult it is for dislocation to migrate as a whole. The smooth and steep mountain-like interface is evolved into a regular tear ridge and dimple interface is formed by adhesive spalling aluminum layer, which can be attributed to the increasing number of crystal grains by vibration and the increase of the contact area between Al and Ti, leading to the bonding and reaction of the interface between the two metals increasing.

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Acknowledgement

This project was sponsored by Natural Science Foundation of Hebei Province (No.E2017203043) and National Natural Science Foundation of China (No.U1604251).

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Correspondence to Fengshan Du.

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Li, L., Du, F. Effects of Sinusoidal Vibration of Crystallization Roller on Microstructure and Mechanical Properties of Ti/Al Laminated Composites by Twin-Roll Casting. Trans Indian Inst Met 76, 2073–2083 (2023). https://doi.org/10.1007/s12666-022-02795-z

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  • DOI: https://doi.org/10.1007/s12666-022-02795-z

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