Effect of Rolling Deformation Amount on Microstructure and Interface Bonding Properties of Al/AZ31/Al Composite Plates
Sandwich structures were formed by clamping a solid soluted AZ31 magnesium alloy plate with two pieces of 1060 pure aluminum rolled plates,and then was rolled to prepare Al/AZ31/Al composite plates at 400 r·min-1 roll speed and 400 ℃ rolling temperature.The effects of rolling deformation amount(30％,45％,60％,80％)on the microstructure and interface bonding properties of the composite plates were studied.The results show that when the rolling deformation amount was 30％,the magnesium alloy plate and the aluminum plate on one side were not combined,the magnesium alloy grains were coarse,and there were a lot of twins.When the rolling deformation amount was 45％,the magnesium alloy plate and the aluminum plate on both sides were tightly bonded,the dynamic recrystallization of magnesium alloy occurred,and the grains were refined.When the rolling deformation amounts were 60％and 80％,the grains of magnesium alloy were further refined,but the aluminum plate at the interface cracked.The interface bonding force decreased with the rolling deformation amount increasing from 45％to 80％.When the rolling deformation amount was 45％,the tensile force then tended to be stable after reaching the peak value,and the interface of each part of the composite plate was well bonded.When the rolling deformation amount was 60％,the tensile force decreased and then tended to be stable after reaching the peak value,and the interface bonding force of each part was different greatly.When the rolling deformation amount was 80％,the tensile force increased by stages,and the difference of interface bonding force of each part was greater.The rolling deformation amount for composite plates to obtain good microstructure and interface bonding performance was 45％.
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