Reduction of the mechanical strength of Al2O3, AlN and SiC under neutron irradiation

Dienst, W.

doi:10.1016/s0022-3115(09)80107-4

Cited by 9 publications

(14 citation statements)

References 7 publications

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“…Degradation of the bending strength of these specimens begins at a fluence of ∼3 × 10 24 -5 × 10 24 n/m 2 for polycrystalline alumina and 5 × 10 25 n/m 2 for SiC, 60,63 and degradation of the bending strength was almost proportional to the corresponding volume increases. Furthermore, the initial variation in strength was maintained after irradiation, which suggests that the neutron irradiation apparently had no influence on the flaws that initiate cracks.…”

Section: (2) Bending or Compressive Strength And Fracture Toughnessmentioning

confidence: 88%

“…In regard to the relationship between fracture toughness and bending strength, Dienst and Zimmermann 63 mentioned that, generally, the decrease in fracture toughness due to neutron irradiation was comparatively small for polycrystalline ceramics, relative to the reduction of the fracture strength, with some exceptions (based on the relatively large number of measurements on both fracture toughness and bending strength for polycrystalline Al 2 O 3 , SiC, and AlN that was irradiated up to 6.0 × 10 25 -3.2 × 10 26 n/m 2 at 400°-550°C). Degradation of the bending strength of these specimens begins at a fluence of ∼3 × 10 24 -5 × 10 24 n/m 2 for polycrystalline alumina and 5 × 10 25 n/m 2 for SiC, 60,63 and degradation of the bending strength was almost proportional to the corresponding volume increases. Furthermore, the initial variation in strength was maintained after irradiation, which suggests that the neutron irradiation apparently had no influence on the flaws that initiate cracks.…”

Section: (2) Bending or Compressive Strength And Fracture Toughnessmentioning

confidence: 88%

“…In MgO, 57 a 5% decrease in Young's modulus also was reported for specimens with a 0.6% decrease in density via neutron irradiation. Recently, Dienst 60 reported the following changes in the Young's modulus, as measured using the ultrasonic pulse velocity: −9% for SiC, −13% for Al 2 O 3 , and −32% for AlN-5% Al 2 O 3 (after neutron irradiation up to 2 × 10 26 n/m 2 at 420°-540°C). The corresponding volume swelling was ∼1%, ∼3%, and ∼3%, respectively.…”

Section: (1) Elastic Modulusmentioning

confidence: 99%

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Effects of Neutron Irradiation on the Mechanical Properties of Magnesium Aluminate Spinel Single Crystals and Polycrystals

Yano

1999

Journal of the American Ceramic Society

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The effect of fast neutron irradiation on the mechanical properties of magnesium aluminate spinel single crystals and polycrystals, such as bending strength, fracture toughness, Young's modulus, and hardness, was summarized based on the reported data. Essentially, the changes in these properties are dependent on the nature and concentration of neutron-irradiation-induced defects. Furthermore, the efficiency of damage accumulation is known to be dependent on temperature. Spinel shows superior resistance to the formation of defect aggregates, and the recombination of point defects occurs efficiently under neutron irradiation; therefore, the change in mechanical properties is not critical, up to very high neutron fluences, and the spinel maintains its structural integrity.

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Section: (2) Bending or Compressive Strength And Fracture Toughnessmentioning

confidence: 88%

Section: (2) Bending or Compressive Strength And Fracture Toughnessmentioning

confidence: 88%

Section: (1) Elastic Modulusmentioning

confidence: 99%

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Effects of Neutron Irradiation on the Mechanical Properties of Magnesium Aluminate Spinel Single Crystals and Polycrystals

Yano

1999

Journal of the American Ceramic Society

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“…T HE consideration of silicon carbide (SiC) as a candidate structural material for fusion applications has been discussed extensively in the literature for the past two decades. [1][2][3][4][5][6][7][8][9] Attractive characteristics of SiC include its low density and good mechanical properties at elevated temperatures, as well as its low neutron activation. However, similar to many other ceramic systems, the widespread use of SiC in engineering applications has been limited by its low fracture toughness, which is typically 2.5-4.0 MPaиm 1/2 , based on conventional fracture toughness techniques.…”

Section: Introductionmentioning

confidence: 99%

Mechanical‐ and Physical‐Property Changes of Neutron‐Irradiated Chemical‐Vapor‐Deposited Silicon Carbide

Osborne

Hay

Snead

et al. 1999

Journal of the American Ceramic Society

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Indentation and density measurements have revealed important changes in the mechanical and physical properties of silicon carbide (SiC) due to neutron irradiation. Specifically, the changes in the elastic modulus, hardness, fracture toughness, and density with irradiation have provided an understanding of the expected performance of SiC and SiC composites in nuclear applications. After the accumulated damage has saturated, these mechanical properties were affected primarily by the irradiation temperature. Chemical-vapor-deposited (CVD) SiC was irradiated above the saturation fluence and yielded volumetric swelling of 2.6% and 1.3% for irradiation temperatures of 100°-150°C and 500°-550°C, respectively. At the same respective temperatures, the elastic modulus decreased from an unirradiated value of 503 GPa to ∼420 and 450 GPa. Conversely, the hardness increased from 36 GPa for the unirradiated CVD SiC to 38 and 40 GPa for the samples irradiated at 100°-150°C and 500°-550°C, respectively. Interestingly, these two independent properties approached almost-constant levels after exposure to a fluence of 0.5 × 10 25 n/m 2 , E > 0.1 MeV. Indentation fracture toughness measurements, which were within the range of values in the literature for conventional fracture toughness procedures for SiC, increased from ∼2.8 MPaؒm 1/2 for the unirradiated samples to 3.7 and 4.2 MPaؒm 1/2 for the samples that were irradiated at 100°-150°C and 500°-550°C, respectively.

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“…The mechanical properties in irradiated nonmetals at temperatures below recovery Stage V exhibit variable behavior, with observations of increased hardness, 226,227 unchanged strength, 228 and decreased hardness or flexural strength. [229][230][231][232]…”

Section: Radiation-induced Hardeningmentioning

confidence: 99%

Radiation-Induced Effects on Microstructure

Zinkle¹

2020

Comprehensive Nuclear Materials

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This article was originally published in the Comprehensive Nuclear Materials published by Elsevier, and the attached copy is provided by Elsevier for the author's benefit and for the benefit of the author's institution, for non-commercial research and educational use including without limitation use in instruction at your institution, sending it to specific colleagues who you know, and providing a copy to your institution's administrator. All other uses, reproduction and distribution, including without limitation commercial reprints, selling or licensing copies or access, or posting on open internet sites, your personal or institution's website or repository, are prohibited. For exceptions, permission may be sought for such use through Elsevier's permissions site at:

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Reduction of the mechanical strength of Al2O3, AlN and SiC under neutron irradiation

Cited by 9 publications

References 7 publications

Effects of Neutron Irradiation on the Mechanical Properties of Magnesium Aluminate Spinel Single Crystals and Polycrystals

Effects of Neutron Irradiation on the Mechanical Properties of Magnesium Aluminate Spinel Single Crystals and Polycrystals

Mechanical‐ and Physical‐Property Changes of Neutron‐Irradiated Chemical‐Vapor‐Deposited Silicon Carbide

Radiation-Induced Effects on Microstructure

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