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Phase equilibria and crystal structure of ternary compounds in al-rich corner of al-er-y system at 673 and 873 K

Journal of Materials Science & Technology 2021年第1期60卷 128-138页

作者： Xiaoxu Liu yong Du Shuhong Liu Kaiming Cheng Zhihong Zhang State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan250014China Inner Mongolia Niobium Metallurgical Engineering Laboratory Baotou Research Institute of Rare EarthsBaotou014030China

Phase equilibria in the al-rich corner of the al-er-y ternary system from 65 at.% to 100 at.% al at 673 and873 K were investigated,and the two isothermal sections were established by X-ray diffraction(XRD),scanning electron microscope(SEM) and electron probe micro analysis(EPMA).Three ternary-phase regions are observed and the phase relations are similar at both isothermal sections.There are two ternary compounds,and a complete crystal structures and composition ranges of the two ternary compounds are determined as τ_(1)(al_(75-76)er_(15-22)y_(2-10),R-3 m) and τ_(2)(al_(75-76)er_(11-17)y_(7-14),P6_(3)/mmc) via XRD,focused ion beam coupled with transmission electron microscope(FIB-TEM) and EPMA.Meanwhile,the solubilities of the third element in the binary compounds at both temperatures are measured.The solubility of er inβ-al_(3) y phase reaches to 6.6 at.% and that of y in al_(3) er phase reaches to 1.5 at.% after annealing at 873 K.The temperature effect is not obvious for the phase equilibria at 673 and 873 K,but it increases the solubility of er in β-al_(3) y,while it is not obvious for both the solubility of y in al_(3) er and that of er and y in(al).The phase equilibria of the al-er-y ternary system determined by the present work have provided new phase diagram data for a future thermodynamic assessment of this system.

关键词： aluminium alloy Phase equilibria al-er-y XRD EPMA TEM

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