Study on temperature control and bonding properties of Ti/Al composite plates rolled by differential temperature rolling with mobile induction heating

Abstract

To address the issue of non-uniform temperature distribution in titanium plates during electromagnetic induction heating, this study proposes an innovative coil structure designed to enhance induced eddy current density in the center of the titanium plate. By employing moving induction heating, a uniform temperature distribution across the plate width is achieved. By conducting differential temperature rolling composite experiments, titanium/aluminum composite plates with high bonding strength and excellent flatness can be prepared. The results show that by moving induction heating, high and low temperature regions during stationary heating can complement each other, thereby promoting uniform distribution of temperature in the width direction of the titanium plate. When the titanium plate is heated to 800 °C and room-temperature aluminum plate rolled, greater rolling reduction improved interfacial bonding strength, reaching an interfacial shear strength of 117.3 MPa at a 38.7 % reduction. Additionally, increased reduction facilitated sub-grain and grain refinement at the interface, enhancing the plasticity and toughness of the titanium layer, mitigating dislocation movement, and reducing interfacial stress concentration. Furthermore, brittle precipitates of Al₉Si formed in the aluminum matrix near the bonding interface, resulting in shear fractures within the aluminum matrix near the interface.