ABSTRACT Interactions of rare earth elements with Ti–Si system at high temperatures are of academic interests for the development of refractory lightweight structural materials. As part of the fundamental research of multicomponent Ti–Si-based alloys, solid phase equilibria of the Gd–Ti–Si ternary system at 1073 K and Er–Ti–Si ternary system at 1273 K were investigated through analysis of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). Two isothermal sections of the phase diagram and solid solubility of each equilibrium phase have been determined. The ternary compounds i.e. ErTiSi, GdTiSi, Er2Ti3Si4 and Gd1.9Ti3Si4 have been confirmed in the present condition. Binary compound ErSi1-x has not been observed. Ti3Si was confirmed to be nonexistent at both 1073 K and 1273 K. There is no intermetallic compound present in both Gd–Ti and Er–Ti binary systems.

中文翻译：

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(Gd, Er)-Ti-Si 系统在高温下的相平衡

摘要 高温下稀土元素与 Ti-Si 系统的相互作用对于开发耐火轻质结构材料具有学术意义。作为多组分 Ti-Si 基合金基础研究的一部分，通过 X 射线衍射分析研究了 1073 K 下 Gd-Ti-Si 三元系统和 1273 K 下 Er-Ti-Si 三元系统的固相平衡(XRD)、扫描电子显微镜 (SEM) 和能谱仪 (EDS)。已确定相图的两个等温截面和每个平衡相的固溶度。三元化合物即 ErTiSi、GdTiSi、Er2Ti3Si4 和 Gd1.9Ti3Si4 已在当前条件下得到证实。尚未观察到二元化合物 ErSi1-x。Ti3Si 被证实在 1073 K 和 1273 K 都不存在。