Study on Microstructure and Tensile Fracture of AZ91D-2.2Cu Alloy Plate under High Extrusion Ratio
By analyzing the microstructure evolution and tensile fracture testing of AZ91D-2.2Cu alloy plate under a high extrusion ratio,the intermetallic compounds with block shaped morphology in AZ91D+2.2Cu alloy were characterized.It was found that there were mainly three elements:Mg,Zn,and Cu.At this time,the atomic ratio of Mg∶Zn∶Cu reached 37.2∶44.8∶19.2,belonging to the MgZnCu phase.AZ91D+2.2Cu alloy forms MgZnCu phase with stable diffraction intensity,and its proportion remains basically constant.The AZ91D+2.2Cu alloy no longer has cleavage steps,resulting in fewer tearing edges,and the size and depth of the tough dimples have been significantly improved.There are also some discontinuous MgZnCu phases appearing within the tough dimples.
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