Effect of ARB Passes on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Plate
The accumulative roll-bonding(ARB)experiment at 400℃rolling temperature was carried out.The microstructure and mechanical properties of AZ31 magnesium alloy plate with different rolling passes were characterized by optical microscope,tensile testing machine,microhardness tester,X-ray diffractometer and scanning electron microscope.The effects of ARB passes on the grain size,basal texture and mechanical properties of AZ31 magnesium alloy plate were studied.The results show that the grain refinement of ARB process mainly occurs in the first three passes,and the grain is no longer obviously refined,even slightly grows in the subsequent cycle passes.The comprehensive mechanical properties are the best in the third pass.Although the existence of shear band alleviates the stress concentration,improves the plasticity and weakens the basal texture,it is also easy to form cracks,accelerates the fracture of the plate and sharply reduces the elongation.The base texture strength decreases first and then increases with the increase of rolling passes.
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