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本文研究了稀土元素钆(Gd)对Ti-6Al-4V和IMI829合金组织与性能的影响。结果表明,Gd在这两种合金中的行为是不同的。在Ti-6Al-4V合金中添加0.25～1.0wt%Gd,产生Gd-Ti-Al型沉淀物粒子,当Gd含量超过0.5wt%以上时,沉淀物以长条状富集于晶界,严重恶化合金高温(950℃以上)下的可锻性;在IMI829合金中添加0.1～1.0wt%Gd,可细化该合金的组织,产生Gd-Sn-Ti型沉淀物粒子,改善了合金的拉伸性能,其中,含0.2wt%Gd的IMI829合金具有最佳的拉伸性能。当IMI829合金中Gd含量较高时,虽然沉淀物粗化并呈不均匀分布,但由于晶粒的细化,合金的拉伸性能仍有所改善。
In this paper, the effects of rare earth gadolinium (Gd) on the microstructure and properties of Ti-6Al-4V and IMI829 alloys were studied. The results show that the behavior of Gd in these two alloys is different. In the Ti-6Al-4V alloy, Gd-Ti-Al type precipitated particles are formed by adding 0.25-1.0wt% Gd. When the Gd content exceeds 0.5wt% or more, the precipitates are enriched in the grain boundaries in the form of stripes, Deteriorate the malleability of the alloy at high temperature (above 950 ℃); add 0.1-1.0wt% Gd to the alloy IMI829 to refine the microstructure of the alloy and produce Gd-Sn-Ti type precipitated particles to improve the tensile properties of the alloy The tensile properties of IMI829 alloy containing 0.2wt% Gd were the best. When the content of Gd in IMI829 alloy is high, although the precipitates are roughened and unevenly distributed, the tensile properties of the alloy are still improved due to the grain refinement.