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Abstract：
This study explores the microstructural characteristics of gadolinium (Gd)-rich phases in titanium (Ti) alloys through comprehensive electron microscopy analysis. The Ti alloys were produced using plasma arc melting and subsequently hot-forged. Elaborate material characterization, including scanning electron microscopy, electron backscatter diffraction, and energy dispersive spectroscopy, revealed the formation of round or angular Gd oxides and elongated Gd-rich grains within the alloy. High-magnification transmission electron microscopy and X-ray diffraction confirmed the presence of the FCC-type γ-Gd phase, influenced by the oxygen intake during casting, coexisting with Gd2O3 due to their similar crystal structures. The study also observed internal twins in the Gd grains, potentially delaying the transformation to the stable α-Gd phase. The significant mechanical property differences between the Gd-rich phases and the Ti matrix caused defects at phase interfaces during hot processing, weakening the Gd phase. This work enhances the understanding of Gd phase formation and its implications on the mechanical properties of Ti-Gd alloys.
摘要：
本研究通过全面的电子显微镜分析探讨了钛（Ti）合金中富钆（Gd）相的微观结构特征。使用等离子弧熔化并随后热锻来生产Ti合金。详细的材料表征，包括扫描电子显微镜,电子背散射衍射，和能量色散光谱，揭示了在合金内形成圆形或角形的Gd氧化物和细长的富含Gd的晶粒。高倍率透射电子显微镜和X射线衍射证实了FCC型γ-Gd相的存在，受铸造过程中氧气摄入量的影响，由于其相似的晶体结构与Gd2O3共存。该研究还观察到Gd颗粒中的内部孪晶，潜在地延迟向稳定的α-Gd相的转化。富Gd相和Ti基体之间的显著机械性能差异在热加工期间引起相界面处的缺陷。削弱Gd阶段。这项工作增强了对Gd相形成及其对Ti-Gd合金机械性能的影响的理解。
