The effect laws of annealing temperature and annealing time on the microstructure and mechanical properties of Mg/Al compos-ite plates interface were investigated by annealing of Mg/Al composite plates manufactured by corrugated-flat rolling.The results show that thin Mg17Al12 phase diffusion layer is formed at the new bonding interface of the flat Mg/Al plates annealed at 200 ℃ for 30 min,which can promote interface metallurgical bonding and improve interface bonding strength.When annealed at 250 ℃ for 30 min,new bonding interface expands rapidly,and further the IMCs layer composed of Mg17Al12 and Mg2Al3 phases is formed.When the annealing tempera-ture rises to 300 ℃,continuous IMCs layer is formed at the whole interface.The higher the annealing temperature or the longer the annea-ling time,the greater the thickness of IMCs layer.Strong plastic deformation can accelerate the diffusion between atoms at the trough posi-tion interface during high-temperature annealing,resulting in the growth activation energy of the same compound at trough position is less than that at the peak position.Therefore,the thickness of the diffusion layer at trough is greater than that at peak.After the bending tests of annealed Mg/Al composite plates,the interface is not stratified and the matrix is not falling off.With the increase of annealing tempera-ture,the tensile strength at high-temperature of flat Mg/Al composite plates decreases,while the elongation at break increases.
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