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

Abstract

A new, innovative 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 effect of sinusoidal vibration of crystallization roller on composite microstructure was investigated in detail. The results show that the metallurgical bonding of titanium and aluminum is realized by mesh interweaving and mosaic meshing, instead of transition bonding by forming metal compound layer. The meshing depth between titanium and aluminum layers (6.6 µm) of cast-rolling materials with strong vibration of crystallization roller (amplitude 0.87 mm, vibration frequency 25 Hz) is doubled compared with that of traditional cast-rolling materials (3.1 µm), and the composite interfacial strength (27.0 N/mm) is twice as high as that of traditional cast-rolling materials (14.9 N/mm). This is because with the action of high-speed superposition of strong tension along the rolling direction, strong pressure along the width direction and rolling force, the composite linearity evolves from “straight line” with traditional casting-rolling to “curved line”, and the depth and number of cracks in the interface increases greatly compared with those with traditional cast-rolling, which leads to the deep expansion of the meshing area between interfacial layers and promotes the stable enhancement of composite quality.

Keywords

laminated composites / sinusoidal vibration / composite microstructure

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