Effects of Pulse Magnetic Field on Solidification Structure and Mechanical Properties of Mg-6Gd-3Y-0.6Zr Alloy Cast in Graphite Mold
Effects of pulse magnetic field on solidification microstructure and mechanical properties of Mg-6Gd-3Y-0.6Zr alloy cast in graphite mold were investigated by OM,SEM,EDS,XRD and tensile testing machine.The results show that pulse magnetic field treatment can refine grain size of the alloy and improve mechanical properties effectively.With the pulse voltage of 300 V,the pulse frequency of 5 Hz and the die preheating temperature of 400℃,the grain size of the alloy is reduced by 32.9%,and the tensile strength and elongation of the alloy are increased by 14.1%and 16.2%,respectively.In the range of 200～600℃,grain size of the alloy is increased with the increase of die preheating temperature.In the range of 0～300 V,grain size of the alloy is decreased with the increase of pulse volt-age.In the range of 0～10 Hz,the grain size of the alloy is decreased at first and then increased with the increase of pulse frequency,and the turning point is 5 Hz.The mechanical properties of the alloy is corresponded to the grain size of the alloy.With the decrease of grain size in the alloy,the mechanical properties are improved.
Pulse Magnetic FieldMg-6Gd-3Y-0.6Zr AlloySolidification StructureMechanical Properties
NETL
NSTL
万方数据
