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利用光学显微镜、扫描电镜、X射线衍射分析及高温压缩蠕变装置等,研究了稀土元素Gd对Mg-7Al-1Si合金显微组织及蠕变性能的影响。结果表明,适量Gd的加入能明显细化Mg-7Al-1Si合金的晶粒尺寸、改善Mg2Si相的形态,使β相分布更弥散,并提高了合金的抗高温蠕变性能,Gd的加入还使基体中出现新相Al2Gd。Gd含量为1.0%时,合金的组织和成分均匀,细化效果最好,抗高温蠕变性能也最佳。此时晶粒平均尺寸由79.08μm减小到39.12μm,β相含量由10.88%减少到6.98%,同时Mg2Si相形态明显改善,由粗大汉字状变为短杆状及颗粒状,从而提高了合金的抗高温蠕变性能。
The effects of rare earth element Gd on the microstructure and creep properties of Mg-7Al-1Si alloy were studied by means of optical microscope, scanning electron microscopy, X-ray diffraction analysis and high temperature compression creep device. The results show that the addition of proper amount of Gd can obviously refine the grain size of Mg-7Al-1Si alloy, improve the morphology of Mg2Si phase, make the β phase distribution more dispersive and improve the creep resistance of the alloy. The matrix appears in the new phase Al2Gd. When the Gd content is 1.0%, the microstructure and composition of the alloy are uniform and the refining effect is the best, and the creep resistance at high temperature is also the best. The average grain size decreased from 79.08μm to 39.12μm and the content of β phase decreased from 10.88% to 6.98%. Meanwhile, the morphology of Mg2Si phase was improved obviously from coarse Chinese to short rod and granular, which increased the alloy High temperature creep performance.