Effects of Pulse Magnetic Field on Solidification Structure and Mechanical Properties of ZL205A Aluminum Alloy
The impact of pulsed magnetic fields with different excitation frequencies(0,20,40 and 50 Hz)on solidifi-cation structure and mechanical properties of ZL205A aluminum alloy melt was investigated.Optical microscopy(OM)and field emission scanning electron microscopy(FESEM)were employed to analyze solidification structure.The results indicate that the pulsed magnetic field can significantly refine grain size in the alloy,and coarse network-like θ-Al2Cu phase is converted to smaller near-spherical particles,thus enhancing the mechanical properties.The grain size of the alloy is initially decreased and then increased with an increase in excitation frequency,reaching desirable effect at 40 Hz.The average grain size at the edge and center of solidified structure is decreased by 26.83%and 22.36%,respectively,in comparison to those of ones without pulsed magnetic field.Meanwhile,the alloy exhibits the highest yield strength,tensile strength,elongation,and hardness,which are 160 MPa,241 MPa,11.5%,and 62.5 HV,which are increased by 28.0%,17.0%,91.7%,and 13.0%,respectively compared to those of ones with-out pulsed magnetic field.
ZL205A Aluminum AlloyPulse Magnetic FieldGrain RefinementSolidification StructureMechanical Properties
万方数据
维普
