Effects of Pulsed Magnetic Field on Solidified Microstructure and Mechanical Proper-ties of Mg-4Y-2.5Nd-0.5Gd-0.5Zr Alloy
The effects of different pulsed magnetic field process parameters on the solidification microstructure and mechanical properties of Mg-4Y-2.5Nd-0.5Gd-0.5Zr alloy were investigated by OM,SEM,XRD,EDS and univer-sal tensile testing machine.The results indicate that the pulsed magnetic field can effectively improve the solidification structure and mechanical properties of Mg-4Y-2.5Nd-0.5Gd-0.5Zr alloy.In the range of 0～300 V,0～10 Hz and 200～600℃,the grain size of Mg-4Y-2.5Nd-0.5Gd-0.5Zr alloy is gradually decreased with the increase of pulse volt-age,and then increased with the increase of pulse frequency and mold temperature,where the tensile strength and elon-gation are gradually increased with the increase of pulse voltage,and first increased and then decreased with the increase of pulse frequency and mold temperature.With the pulse voltage of 300 V,the pulse frequency of 5 Hz and the mold temperature of 400℃,the grain size of the alloy reaches a minimum value of 41.66 μm,which is 18.82%smaller than that of the untreated alloy.At the same time,the tensile strength and elongation of the alloy reach the maximum value of 184.88 MPa and 4.67%,respectively,which are 10.2%and 45.94%higher than that of the untreated alloy.The optimal pulsed magnetic field treatment process parameters of Mg-4Y-2.5Nd-0.5Gd-0.5Zr alloy are presented as follows:pulse voltage of 300 V,pulse frequency of 5 Hz,mold temperature of 400℃.
Pulsed Magnetic FieldMg-4Y-2.5Nd-0.5Gd-0.5Zr AlloySolidified MicrostructureMechanical Properties
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