Phase equilibria and crystal structure of ternary compounds in Al-rich corner of Al-Er-Y system at 673 and 873 K

作     者：Xiaoxu Liu Yong Du Shuhong Liu Kaiming Cheng Zhihong Zhang Xiaoxu Liu;Yong Du;Shuhong Liu;Kaiming Cheng;Zhihong Zhang

作者机构：State Key Laboratory of Powder MetallurgyCentral South UniversityChangsha410083China Shandong Provincial Key Laboratory of High Strength Lightweight Metallic MaterialsAdvanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan250014China Inner Mongolia Niobium Metallurgical Engineering LaboratoryBaotou Research Institute of Rare EarthsBaotou014030China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第60卷第1期

页      面：128-138页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported from the Open Research Project of State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization National Natural Science Foundation of China(Nos.51671219 and 51801116)。 

主　　题：Aluminium alloy Phase equilibria Al-Er-Y XRD EPMA TEM 

摘      要：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.