Elemental Diffusion Behavior of Cu–Ti Alloys Prepared by Accumulative Roll Bonding‐Deformation Diffusion Process

Abstract

The preparation of Cu–Ti alloys with homogenous elemental distribution is related to the engineering applications. Considering the thickness ratio and cross‐sectional geometry of components change with the increase in cumulative equivalent strain in accumulative roll bonding‐deformation diffusion (ARB‐DD) process, an elemental diffusion model is established based on different solute concentration fields. The accuracy of the model is verified by preparing Cu–Ti alloys in different states. The morphology of Ti layers evolve from a flat to a shuttle‐shaped structure due to the strong shear effect as cumulative equivalent strain increases. The diffusion heat treatment time for homogenization is predicted based on the model, and the results show that the model basically matches with the experimental results. The absolute error of prediction is within 9%, and the average error is about 4.4%. It indicates that the synergistic control of elemental diffusion behavior in ARB‐DD process can be achieved. Besides, it demonstrates that the effective diffusion activation plays a key role in determining the accuracy of the model. The difference of deformation energy storage in various cumulative equivalent strain states causes a significant change in effective diffusion activation energy, thereby producing a great influence on elemental diffusion behavior of Cu/Ti alloys.