脉冲磁场对Mg-6Zn-0.5Zr-1Gd合金组织及性能的影响

Effects of Pulsed Magnetic Field on Microstructure and Properties of Mg-6Zn-0.5Zr-1Gd Alloy

研究了不同的脉冲磁场参数对Mg-6Zn-0.5Zr-1Gd合金凝固组织及力学性能的影响。结果表明,经脉冲磁场处理后,合金的凝固组织和力学性能明显改善。脉冲电压在0~300 V或模具预热温度在200~600℃内,随着脉冲电压或模具温度增加,其晶粒尺寸均逐渐减小;脉冲频率在0~10 Hz范围内,随着脉冲频率增加,其晶粒尺寸先减小后增大。当脉冲电压为300 V,脉冲磁场为5 Hz,模具预热温度为600℃时,合金的力学性能最优,其抗压强度为271.35 MPa,压缩率为22.5%。与未经过磁场处理的合金相比,抗压强度和压缩率分别提高了28.4%和14.2%。

The effects of different pulsed magnetic field parameters on the solidification microstructure and mechanical properties of Mg-Zn-Zr-Gd alloy were investigated.The results reveal that the solidification microstructure and mechanical properties of the alloy are obviously improved under the condition of pulsed magnetic field. With the increase of pulsed voltage(0~300 V) or mould preheating temperature(200~600 ℃), the grain size in the alloy is decreased gradually. With the increase of pulsed frequency(0~10 Hz), the grain size of the alloy is decreased firstly and then increased. With the pulsed voltage of 300 V, the pulsed frequency of 5 Hz and the mould preheating temperature of 600 ℃, the mechanical properties of the alloy present desirable, where the compressive strength and the compression rate of the alloy reach 271.35 MPa and 22.5%, resepctively. Compared with those of the alloy without pulsed magnetic field treatment, the compressive strength and compression rate of treated alloy are increased by 28.4% and 14.2%, respectively.