Atomic-Scale Microstructure of Hf-Al-C Ceramics

被引：4
|
作者：
Nian, Hongqiang [1 ]
Li, Fangzhi [1 ]
Li, Jingjing [1 ]
Wang, Jingyang [1 ]
Zhou, Yanchun [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
[2] Aerosp Res Inst Mat & Proc Technol, Beijing 100076, Peoples R China
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2011年 / 94卷 / 12期
关键词：
THEORETICAL ELASTIC PROPERTY; CRYSTAL-STRUCTURE; GRAIN-BOUNDARIES; OXIDATION; ZR3AL3C5; CARBIDE; ANTIPHASE; ZR2AL3C4; VISCOSITY; BEHAVIOR;
D O I：
10.1111/j.1551-2916.2011.04822.x
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A HfAlC composite composed of HfAl4C4 and Hf2Al4C5 was successfully synthesized by the hot-pressing method. The atomic-scale microstructure was investigated through high-resolution transmission electron microscopy (TEM) and Z-contrast scanning transmission electron microscopy (STEM) imaging. The TEM observations revealed that the HfAlC grains had elongated morphologies. There was no amorphous phase in the grain boundary. The microstructure of the composite was characterized by the stacking faults resulted from the insertion of (Al4C3) units, which led to the formation of a new phase Hf4Al12C13 and intergrowth structure between HfAl4C4 and Hf2Al4C5. In addition, the antiphase grain boundary in the ternary-layered ceramics was first observed and the formation mechanism was discussed.
引用
收藏
页码：4534 / 4540
页数：7
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