Recrystallization of the Structure of Silicon Carbide under Ion Irradiation

2020 ◽  
Vol 75 (2) ◽  
pp. 133-136
Author(s):  
A. A. Shemukhin ◽  
A. M. Smirnov ◽  
A. P. Evseev ◽  
E. A. Vorobyeva ◽  
A. V. Kozhemiako ◽  
...  
JOM ◽  
2021 ◽  
Author(s):  
Alexander J. Leide ◽  
Richard I. Todd ◽  
David E. J. Armstrong

AbstractSilicon carbide is desirable for many nuclear applications, making it necessary to understand how it deforms after irradiation. Ion implantation combined with nanoindentation is commonly used to measure radiation-induced changes to mechanical properties; hardness and modulus can be calculated from load–displacement curves, and fracture toughness can be estimated from surface crack lengths. Further insight into indentation deformation and fracture is required to understand the observed changes to mechanical properties caused by irradiation. This paper investigates indentation deformation using high-resolution electron backscatter diffraction (HR-EBSD) and Raman spectroscopy. Significant differences exist after irradiation: fracture is suppressed by swelling-induced compressive residual stresses, and the plastically deformed region extends further from the indentation. During focused ion beam cross-sectioning, indentation cracks grow, and residual stresses are modified. The results clarify the mechanisms responsible for the modification of apparent hardness and apparent indentation toughness values caused by the compressive residual stresses in ion-implanted specimens.


2018 ◽  
Vol 54 (1) ◽  
pp. 605-612 ◽  
Author(s):  
Kaijie Ning ◽  
Kathy Lu ◽  
Robert J. Bodnar

2009 ◽  
Vol 1215 ◽  
Author(s):  
Dominique Gosset ◽  
Laurence Luneville ◽  
Gianguido Baldinozzi ◽  
David Simeone ◽  
Auregane Audren ◽  
...  

AbstractSilicon carbide is one of the most studied materials for core components of the next generation of nuclear plants (Gen IV). In order to overcome its brittle properties, materials with nanometric grain size are considered. In spite of the growing interest for nano-structured materials, only few experiments deal with their behaviour under irradiation. To assess and predict their evolution under working conditions, it is important to characterize their microstructure and structure. To this purpose, we have studied microcrystalline and nanocrystalline samples before and after irradiation at room temperature with 4 MeV Au ions. In fact, it is well established that such irradiation conditions lead to amorphisation of the material, which can be restored after annealing at high temperature. We have performed isochronal annealings of both materials to point out the characteristics of the healing process and eventual differences related to the initial microstructure of the samples. To this purpose Grazing Incidence X-Ray Diffraction has been performed to determine the microstructure and structure parameters. We observe the amorphisation of both samples at similar doses but different annealing kinetics are observed. The amorphous nanocrystalline sample recovers its initial crystalline state at higher temperature than the microcrystalline one. This effect is clearly related to the initial microstructures of the materials. Therefore, the grain size appears as a key parameter for the structural stability and mechanical properties of this ceramic material under irradiation.


2013 ◽  
Vol 439 (1-3) ◽  
pp. 123-130 ◽  
Author(s):  
Nihed Chaâbane ◽  
Marion Le Flem ◽  
Morgane Tanguy ◽  
Stéphane Urvoy ◽  
Christophe Sandt ◽  
...  

1979 ◽  
Vol 85-86 ◽  
pp. 1081-1084 ◽  
Author(s):  
K. Watanabe ◽  
K. Nakamura ◽  
S. Maeda ◽  
Y. Hirohata ◽  
M. Mohri ◽  
...  

Author(s):  
Xiaowen Liang ◽  
Jinghao Zhao ◽  
Qiwen Zheng ◽  
JiangWei Cui ◽  
Sheng Yang ◽  
...  

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