High-temperature deformation in bulk polycrystalline hafnium carbide consolidated using spark plasma sintering

被引：7
|
作者：
Demirskyi, D. [1 ,2 ,3 ]
Vasylkiv, O. [2 ]
Yoshimi, K. [3 ]
机构：
[1] Tohoku Univ, Adv Inst Mat Res AIMR, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan
[2] Natl Inst Mat Sci, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan
[3] Tohoku Univ, Dept Mat Sci & Engn, 6-6-02 Aramaki Aza Aoba, Sendai, Miyagi 9808579, Japan
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2021年 / 41卷 / 15期
关键词：
Hafnium carbide; Grain size; Flexural strength; High-temperature materials; TANTALUM CARBIDE; IN-SITU; STRENGTH; BEHAVIOR; HFB2; HFC; TAC;
D O I：
10.1016/j.jeurceramsoc.2021.08.038
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：
In this study, we report the three-point flexural strength and fracture toughness of monolithic hafnium carbide up to 2000 degrees C. HfC with different grain sizes was consolidated using the spark plasma sintering method. Coarsegrained monoliths showed a weak dependence on the strain rate during high-temperature tests at 1600 degrees C-2000 degrees C. In contrast, results for the ceramics with a grain size below 20 mu m indicated a positive dependence of the yield strength vs strain rate. This allowed us to identify the activation energy for high-temperature deformation in flexure as 370 kJ/mol. This level of activation energy is in satisfactory agreement with reports about the diffusion of C in hafnium carbide.
引用
收藏
页码：7442 / 7449
页数：8
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