期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 40, 期 3, 页码 588-593出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.10.051
关键词
Arc-melting; High entropy metal diborides; Hardness; Microstructure; X-ray diffraction
资金
- Thousand Talents Program of China
- Sichuan Province
High entropy metal diborides (HEBs) represent a radically new approach to extend the chemical composition window of ultra-high temperature ceramics (UHTCs). In this work, arc-melting was used to produce dense HEBs starting from UHTC powders. In order to understand the influence of each individual diboride within the quinary system (HfB2, ZrB2, TiB2, TaB2 and CrB2), we investigated five quatemary equimolar solid solutions e.g. Hf-Zr-Ti-Ta, Hf-Zr-Ti-Cr, Hf-Zr-Ta-Cr, Hf-Ti-Ta-Cr, Zr-Ti-Ta-Cr and the overall quinary equimolar combination. Arc-melting allowed a rapid screening of favorable and unfavorable combinations. The produced HEBs were free from undesired oxides and characterized by linear variation of lattice parameters typical of diborides and binary solid solutions. Because of evaporation during arc melting, CrB2 was hardly found in the solid solution, suggesting that vapor pressure should be taken into account when designing HEB compositions especially for operating temperatures exceeding 2000 degrees C. Finally, Vickers microhardness ranged between the typical values of starting diborides.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据