Effect Of Electromagnetic Energy On Solidification Structure Of ZL102 Aluminum Alloy

Pulsed electromagnetic fields can transfer heat and kinetic energy without contact,and have been widely used in materials processing and metallurgy.By using the interaction between the pulsed magnetic field and the metal,the purpose of refining the solidified structure,improving the metal quality,improving the mechanical properties,and improving the segregation can be achieved,and it is a veritable green treatment method.In this paper,the effects of pulsed electromagnetic energy on the solidification structure of ZL102 aluminum alloy under different magnetic field treatment temperature and magnetic field treatment time were studied by self-made experimental equipment.The segregation of Si and Fe in the microstructure was explored.It is found that as the temperature of the magnetic field treatment decreases,the bulk silicon phase decreases,the distance between the silicon phases decreases,and the hardness is improved.When the magnetic field treatment temperature is 600°C,the refinement effect of the microstructure is best,the distance between the silicon phases is reduced by 56.18%,and the increase is 10.29%.The bulk silicon phase is mainly concentrated in the core of the ingot,and the edge is less.After the pulsed magnetic field treatment,the uniformity of the structure is improved,the bulk silicon phase is the lowest in the lower position,and the distance between the silicon phases is the smallest.The pulsed electromagnetic energy changes the phase transition temperature of the aluminum alloy during solidification,the liquidus temperature is lowered by 3°C,the solidus line is lowered by 0.6°C,and supercooling occurs.The energy spectrum analysis of the sample shows that the bulk silicon phase and the larger acicular silicon phase are almost entirely composed of Si.The matrix is all Al.In the fibrous silicon phase,the Si content is more,the Al content is less,and the silicon phase The finer the content,the more the Al content increases.In the practical application of the factory,the melt is affected by the flow rate,the cross-sectional area of the chute,etc.,and the processing time of the pulsed magnetic field to the melt is extremely short.Therefore,in this experiment,the magnetic field treatment time is within 1 min,and the electromagnetic energy is solidified on the ZL102 aluminum alloy.Impact.The experimental results show that the magnetic field treatment time is within 1 min.As the magnetic field treatment time is extended,the grain size is gradually reduced and the hardness is gradually increased.During this time,the Joule heat generated is small and has little effect on the solidified structure.When studying the influence of electromagnetic energy on alloy segregation,it is found that the magnetic field treatment time is less than 20 s.Electromagnetic energy has no obvious effect on improving tissue segregation.When the magnetic field treatment time is more than 40 s,electromagnetic energy can improve the segregation of elements in the alloy.