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采用光学金相、扫描电镜、X射线衍射分析和力学性能测试等手段,研究了稀土元素Gd对Mg-6Al-1.2Y-0.9Nd合金微观组织和力学性能的影响。结果表明,Gd的添加并没有细化Mg-6Al-1.2Y-0.9Nd合金的晶粒尺寸,但晶粒尺寸保持在较小的范围内,合金显微组织有所粗化。Gd含量为3.6%时,合金的室温及高温强度达到最大值。Gd的添加对Mg-6Al-1.2Y-0.9Nd合金的高温力学性能有一定改善,尤其是200℃时的力学性能提高较明显,但过量的稀土元素添加使得Mg-6Al合金的强化作用减弱。
The effects of rare earth element Gd on the microstructure and mechanical properties of Mg-6Al-1.2Y-0.9Nd alloy were studied by means of optical metallography, scanning electron microscopy, X-ray diffraction analysis and mechanical properties testing. The results show that the addition of Gd does not refine the grain size of the Mg-6Al-1.2Y-0.9Nd alloy, but the grain size remains in a smaller range and the microstructure of the alloy is coarsened. When the Gd content is 3.6%, the alloy reaches the maximum at room temperature and high temperature. The addition of Gd improves the mechanical properties of Mg-6Al-1.2Y-0.9Nd alloy at elevated temperatures, especially at 200 ℃. However, the addition of excessive rare earth elements weakens the strengthening effect of Mg-6Al-1.2Y-0.9Nd alloy.