Interface Bonding and Deformation Behavior of 6061Al/AZ31Mg Composite Tubes Fabricated by Stagger Spinning

Abstract

In this study, finite element simulation and experiment were used to study the formability of thin-walled 6061Al/AZ31Mg composite tubes prepared by stagger spinning and the effect of thickness reduction on both deformation synchronism and interface bonding. FE simulation results showed that gradient distributed stress and strain from outer to inner tube caused by local loading of rollers resulted in larger elongation and thinning of outer tube than inner tube. The deformation synchronism was better at 300–350 °C. Well-formed composite tubes were obtained after single-pass stagger spinning with various thickness reduction amounts at 350 °C. When the thickness reduction was greater than 40%, well-bonded interface of Al/Mg composite tubes could be achieved. Subsequent annealing showed that with the increase in annealing temperature and holding time, the thickness of diffusion layer at interface increased. The interface structure after annealing at 350 °C for 90 min was Al–Al3Mg2, Al3Mg2–Al12Mg17 and Al12Mg17–Mg.