摘要
Hf-Ti-Sb三元系包含高熔点金属Hf、Ti与低熔点易挥发金属Sb,其三元相图至今尚未被完整测定。本文采用焊接密封方法制备Hf-Ti-Sb三元扩散偶,并在773 K等温退火14 d,获得扩散充分且组织完整的扩散层。通过电子探针(EPMA)与X射线衍射(XRD)分析,发现了(α(Hf),α(Ti))、(Sb)两个固溶体和七个具有一定固溶度的二元化合物:(TiHf)_(3)Sb、(HfTi)_(3)Sb、(TiHf)_(2)Sb、(TiHf)_(11-x)Sb_(8-y)、(TiHf)Sb、(HfTi)Sb和(Hf,Ti)Sb_(2),没有发现三元化合物;本实验首次认定了773 K下化合物(HfTi)_(3)Sb的存在。基于以上结果,完整构建了Hf-Ti-Sb三元系在773 K的等温截面相图,该相图包含9个单相区、14个两相平衡区和6个三相平衡区。本研究为Hf-Ti-Sb三元系的相平衡研究及Half-Heusler热电材料的开发提供了重要的实验依据。
The Hf Ti Sb ternary system contains high melting point metals Hf and Ti,as well as low melting point volatile metal Sb,and its ternary phase diagram has not yet been determined.In this study,Hf-Ti-Sb ternary diffusion couples were prepared by arc-welding sealing technique,a fully inter-diffused and complete structure diffusion zones were obtained after annealing isothermally at 773 K for 14 d.Through electron probe microanalysis(EPMA)and X-ray diffraction(XRD)analysis,two solid solutions of(α(Hf),α(Ti))and(Sb)and seven binary compounds with certain solid solubility are discovered:(TiHf)_(3)Sb,(HfTi)_(3)Sb,(TiHf)_(2)Sb,(TiHf)_(11-x)Sb_(8-y),(TiHf)Sb,(HfTi)Sb and(Hf,Ti)Sb_(2).No ternary compounds are found.The existence of compound(HfTi)_(3)Sb is confirmed experimentally for the first time.Based on the above results,a complete Hf-Ti-Sb ternary isothermal section at 773 K is constructed,which includes 9 single-phase regions,14 two-phase equilibrium regions and 6 three-phase equilibrium regions.This study provides important experimental evidence for the Hf-Ti-Sb ternary system phase equilibrium research and the development of Half-Heusler thermoelectric materials.
作者
张玉碧
杨晓亮
张以恒
陈丹
杨阳
ZHANG Yubi;YANG Xiaoliang;ZHANG Yiheng;CHEN Dan;YANG Yang(School of Electrical and Information Engineering,Henan University of Engineering,Zhengzhou 451191,China;Chongqing Materials Research Institute Co.,Ltd.,Chongqing 400707,China;Zhongshan Institute,University of Electronic Science and Technology of China,Zhongshan 528400,China)
出处
《中国有色金属学报》
北大核心
2025年第8期2803-2810,共8页
The Chinese Journal of Nonferrous Metals
基金
河南省自然科学基金资助项目(232300420101)
国家自然科学基金资助项目(62173126)
中原科技创新领军人才计划资助项目(234200510027)。
作者简介
通信作者:张玉碧,教授,博士,电话:0371-62508846,E-mail:ybzhg@126.com。
