Nanoindentation characterization of deformation and failure of aluminum oxynitride

Guo, Junjie; Wang, Ke; Fujita, Takeshi; McCauley, James W.; Singh, Jogender; Chen, M.W.

doi:10.1016/j.actamat.2010.11.034

Cited by 50 publications

(25 citation statements)

References 38 publications

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“…Anisotropic second-order elastic constants for AlON have been computed using first principles (Gazonas et al, 2010), as have pressure dependencies of second-order elastic coefficients (Batyrev et al, 2011). Recent indentation experiments suggest that AlON may be highly elastically anisotropic (Guo et al, 2011), in qualitative agreement with anisotropic constants used in the present work but contradicting previous work wherein nearly isotropic elastic constants were used (Clayton, 2011a). 4.…”

Section: Summary and Discussionsupporting

confidence: 62%

“…Transgranular fracture has been observed in AlON deformed at high rates (Paliwal et al, 2008;McCauley et al, 2009) and in static indentation experiments (Guo et al, 2011). 8.…”

Section: Summary and Discussionmentioning

confidence: 95%

“…Greater physical realism would be attained from finite element meshes of microstructures obtained from sectioned material samples, with intial lattice orientation distributions obtained from EBSD measurements, for example (Brahme et al, 2006;Rollett et al, 2007). In particular, SiC-N can often exhibit relatively elongated grains (Lee et al, 2005;Ray et al, 2007;Vargas-Gonzalez et al, 2010), whereas AlON often exhibits relatively equiaxed grains (Corbin, 1989;McCauley et al, 2009;Guo et al, 2011). 2.…”

Section: Summary and Discussionmentioning

confidence: 99%

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Mesoscale modeling of nonlinear elasticity and fracture in ceramic polycrystals under dynamic shear and compression

Clayton

Kraft

Leavy

2012

International Journal of Solids and Structures

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a b s t r a c tDynamic deformation and failure mechanisms in polycrystalline ceramics are investigated through constitutive modeling and numerical simulation. Two ceramics are studied: silicon carbide (SiC, hexagonal crystal structure) and aluminum oxynitride (AlON, cubic crystal structure). Three dimensional finite element simulations incorporate nonlinear anisotropic elasticity for behavior of single crystals within polycrystalline aggregates, cohesive zone models for intergranular fracture, and contact interactions among fractured interfaces. Boundary conditions considered include uniaxial strain compression, uniaxial stress compression, and shear with varying confinement, all at high loading rates. Results for both materials demonstrate shear-induced dilatation and increasing shear strength with increasing confining pressure. Failure statistics for unconfined loading exhibit a smaller Weibull modulus (corresponding to greater scatter in peak failure strength) in AlON than in SiC, likely a result of lower prescribed cohesive fracture strength and greater elastic anisotropy in the former. In both materials, the predicted Weibull modulus tends to decrease with an increasing number of grains contained in the simulated microstructure.Published by Elsevier Ltd.

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Section: Summary and Discussionsupporting

confidence: 62%

“…Transgranular fracture has been observed in AlON deformed at high rates (Paliwal et al, 2008;McCauley et al, 2009) and in static indentation experiments (Guo et al, 2011). 8.…”

Section: Summary and Discussionmentioning

confidence: 95%

Section: Summary and Discussionmentioning

confidence: 99%

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Mesoscale modeling of nonlinear elasticity and fracture in ceramic polycrystals under dynamic shear and compression

Clayton

Kraft

Leavy

2012

International Journal of Solids and Structures

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“…ABF-STEM of amorphous shear bands. To illustrate the structure of the indentation-induced amorphous B 4 C, the cross-sectional TEM specimen was sliced from a residual indent using a focused ion beam milling (FIB) technique 26,27 . The detailed process has been illustrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

Atomic structure of amorphous shear bands in boron carbide

et al. 2013

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Amorphous shear bands are the main deformation and failure mode of super-hard boron carbide subjected to shock loading and high pressures at room temperature. Nevertheless, the formation mechanisms of the amorphous shear bands remain a long-standing scientific curiosity mainly because of the lack of experimental structure information of the disordered shear bands, comprising light elements of carbon and boron only. Here we report the atomic structure of the amorphous shear bands in boron carbide characterized by state-of-the-art aberration-corrected transmission electron microscopy. Distorted icosahedra, displaced from the crystalline matrix, were observed in nano-sized amorphous bands that produce dislocation-like local shear strains. These experimental results provide direct experimental evidence that the formation of amorphous shear bands in boron carbide results from the disassembly of the icosahedra, driven by shear stresses.

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“…17 Figure 6(b) depicts the experimental Raman spectra of AlON. 20 The Raman spectrum of cubic AlON is composed of a number of phonon modes at 304, 397, 626, 747, and 915 cm À1 related with 3T2g, Eg, and A1g modes of spinel. The modes can be seen in simulations of Raman activities (Figure 6(a)).…”

Section: Vibration Spectramentioning

confidence: 99%

Density functional theory and evolution algorithm calculations of elastic properties of AlON

Batyrev

Taylor

Gazonas

et al. 2014

Journal of Applied Physics

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Different models for aluminum oxynitride (AlON) were calculated using density functional theory and optimized using an evolutionary algorithm. Evolutionary algorithm and density functional theory (DFT) calculations starting from several models of AlON with different Al or O vacancy locations and different positions for the N atoms relative to the vacancy were carried out. The results show that the constant anion model [McCauley et al., J. Eur. Ceram. Soc. 29(2), 223 (2009)] with a random distribution of N atoms not adjacent to the Al vacancy has the lowest energy configuration. The lowest energy structure is in a reasonable agreement with experimental X-ray diffraction spectra. The optimized structure of a 55 atom unit cell was used to construct 220 and 440 atom models for simulation cells using DFT with a Gaussian basis set. Cubic elastic constant predictions were found to approach the experimentally determined AlON single crystal elastic constants as the model size increased from 55 to 440 atoms. The pressure dependence of the elastic constants found from simulated stress-strain relations were in overall agreement with experimental measurements of polycrystalline and single crystal AlON. Calculated IR intensity and Raman spectra are compared with available experimental data.

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Nanoindentation characterization of deformation and failure of aluminum oxynitride

Cited by 50 publications

References 38 publications

Mesoscale modeling of nonlinear elasticity and fracture in ceramic polycrystals under dynamic shear and compression

Mesoscale modeling of nonlinear elasticity and fracture in ceramic polycrystals under dynamic shear and compression

Atomic structure of amorphous shear bands in boron carbide

Density functional theory and evolution algorithm calculations of elastic properties of AlON

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