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题名: Atomic-scale microstructure of Hf2Al4C5 ceramic synthesized by spark plasma sintering
作者: Song, Kepeng;  Zhang, Hui;  Du, Kui;  Qi, Dongqing;  Chen, Houwen;  Wang, Xiaohui;  Nie, Jian-Feng;  Ye, Hengqiang
发表日期: 2017-7-1
摘要: A layered ternary carbide phase, Hf2Al4C5, was successfully synthesized by spark plasma sintering method. Detailed (atomic-scale) microstructure of the ternary carbide was investigated by aberration-corrected scanning transmission electron microscopy and atomic-resolution energy dispersive X-ray spectroscopy. Hf2Al4C5 crystal grains have elongated morphologies and are characterized with a high density of stacking faults with the insertion of additional (Al4C3) or (HfC) units. Periodic stacking of Hf2Al4C5 and HfAl4C4 units along the [0001] direction is frequently observed in the Hf2Al4C5 crystal, and it leads to the formation of Hf4Al12C13, which consists of 2/3 Hf2Al4C5 unit cell and 1/2 HfAl4C4 unit cell. In addition, Z-shaped planar defects are observed in Hf2Al4C5 grains, and the formation mechanism of the Z-shaped defects was proposed as blocking effects of the Hf diffusion in Al4C3 by pre-existing {1-101} pyramidal stacking faults in Al4C3.
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Recommended Citation:
Song, Kepeng,Zhang, Hui,Du, Kui,et al. Atomic-scale Microstructure Of Hf2al4c5 Ceramic Synthesized By Spark Plasma Sintering[J]. Journal Of The American Ceramic Society,2017,100(7):3208-3216.

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