Research On The Properties Of Warm Heating Of Magnesium Alloy

It's one of the hot spot on the material field that the research on the plastic deformationof magnesium alloys. As it's structure, magnesium alloy has the smaller plastic deformation atthe normal atmospheric temperature and it's forming technology should be proceeded at thehigher temperature. It's has the most important significance of the formulation and theunderstanding of the forming technology of magnesium alloy by researching the magnesium'sbehavior on the deformation and it's mechanical property.The formability and structure evolution were investigated by thermal simulationcompressing test that AZ31 and ZK60 wrought magnesium alloys were deformed at differenttemperature and speed rate. After the test the hardness analysis was done to the compressedtest samples.The results indicate that the thermal simulation curves of AZ31 and ZK60 have differentforms. The curve of AZ31 has the character of dynamic recrystallization and the materialcan be deformed successive, while most curves of ZK60 have the other obvious character thataround 0.2 in strain the stress reachs the peak and declines rapidly afterwards and lands thelowest. The decline of the curve illustrates the test sample has been destroyed and the cracklecan be found on the test samples correspondingly. After the analysis of the results can receivethe optimized composite of the deformed parameters and get the reasonable deformedtemperatures are 200℃ and 400℃, which can play a directing role in determing thedeforming technology of wrought magnesium alloys. From the hardness of the thermalsimulation test samples can include that the variation laws of the hardness of AZ31 and ZK60are different. The hardness of AZ31 declines by increasing in temperature as it has less secondphase. ZK60 has the lower hardness at 200℃ and 250℃ and reachs the lowest at 250℃with the more obvious effect of dynamic recrystallization on the test samples and the lesseffect of hardened at the stage. It can also be found from the curve of thermal simulation thatZK60 has the character of dynamic recrystallization under 250℃ and 1s^-1. The twin crystal isthe main plastic deformation property of magnesium alloy can be concluded from the analysisof the metallographic microstructure.