M-Y-Zr-Nd 合金微观结构、力学性能、电磁屏蔽性能的研究

Microstructure, mechanical properties and electromagnetic shielding effectiveness of Mg-Y-Zr-Nd alloy

摘要:

制备了不同Nd含量的Mg-Y-Zr-xNd合金铸锭，研究了Nd含量对微观结构、力学性能和电磁屏蔽性能的影响。实验结果表明，当Nd含量增加到2.63%时，晶粒尺寸从70.1μm细化到42.9μm，并且在晶界不连续分布骨骼状β相。随着Nd含量增加，合金强度和电磁屏蔽性能都会增加。Nd含量为2.63%时同时具有良好的强度和电磁屏蔽性能，T6处理能进一步提高屏蔽效能。根据分析以上实验结果是由于Nd的添加量不同引起微观结构不同造成的。

Abstract:

The as-cast Mg-Y-Zr-xNd alloys with different Nd contents were prepared, and the effects of Nd content on microstructure, mechanical properties and electromagnetic interference (EMI)shielding properties were investigated.The results showed that the grain size was refined from 70.1 to 42.9 μm, discontinuous bone-shaped β phases formed mostly in the triple junction of grain boundaries when the content of Nd increased to 2.63 wt.%. The mechanical properties and EMI shielding capacity were both enhanced significantly by adding Nd element. The alloy with 2.63 wt.% Nd had a good combination of mechanical properties and EMI properties. T6 heat treatment was able to further improve the EMI shielding effectiveness. The above-mentioned observations are analyzed in terms of microstructural variation due to the Nd addition.