Comparison of Texture Analysis Techniques for Highly Oriented α‐Al<sub>2</sub>O<sub>3</sub>

Seabaugh, Matthew M.; Vaudin, Mark D.; Cline, James P.; Messing, Gary L.

doi:10.1111/j.1151-2916.2000.tb01510.x

Cited by 56 publications

(69 citation statements)

References 19 publications

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“…Among the various methods discussed, the quantitative texture analysis techniques include pole figure analysis, EBSD, Rietveld refinement, and the rocking-curve method. Nevertheless, in several studies, it has been suggested that the XRD rocking-curve method is the most time-efficient and accurate texture analysis technique, as demonstrated for Al 2 O 3 [118] and PMN-28 PT [119] ceramics.…”

Section: Electron Backscattered Diffraction (Ebsd) Methodmentioning

confidence: 99%

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Textured silicon nitride: processing and anisotropic properties

Zhu

Sakka

2008

Science and Technology of Advanced Materials

158

104

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Textured silicon nitride (Si 3 N 4 ) has been intensively studied over the past 15 years because of its use for achieving its superthermal and mechanical properties. In this review we present the fundamental aspects of the processing and anisotropic properties of textured Si 3 N 4 , with emphasis on the anisotropic and abnormal grain growth of β-Si 3 N 4 , texture structure and texture analysis, processing methods and anisotropic properties. On the basis of the texturing mechanisms, the processing methods described in this article have been classified into two types: hot-working (HW) and templated grain growth (TGG). The HW method includes the hot-pressing, hot-forging and sinter-forging techniques, and the TGG method includes the cold-pressing, extrusion, tape-casting and strong magnetic field alignment techniques for β-Si 3 N 4 seed crystals. Each processing technique is thoroughly discussed in terms of theoretical models and experimental data, including the texturing mechanisms and the factors affecting texture development. Also, methods of synthesizing the rodlike β-Si 3 N 4 single crystals are presented. Various anisotropic properties of textured Si 3 N 4 and their origins are thoroughly described and discussed, such as hardness, elastic modulus, bending strength, fracture toughness, fracture energy, creep behavior, tribological and wear behavior, erosion behavior, contact damage behavior and thermal conductivity. Models are analyzed to determine the thermal anisotropy by considering the intrinsic thermal anisotropy, degree of orientation and various microstructure factors. Textured porous Si 3 N 4 with a unique microstructure composed of oriented elongated β-Si 3 N 4 and anisotropic pores is also described for the first time, with emphasis on its unique mechanical and thermal-mechanical properties. Moreover, as an important related material, textured α-Sialon is also reviewed, because the presence of elongated α-Sialon grains allows the production of textured α-Sialon using the same methods as those used for textured β-Si 3 N 4 and β-Sialon.

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Section: Electron Backscattered Diffraction (Ebsd) Methodmentioning

confidence: 99%

“…In addition to the above texture analysis methods, other methods, such as the Rietveld refinement and the XRD rocking-curve method [117], can also be applied to β-Si 3 N 4 ceramics [118,119]. Each method has its own strengths and weaknesses.…”

Section: Electron Backscattered Diffraction (Ebsd) Methodmentioning

confidence: 99%

Textured silicon nitride: processing and anisotropic properties

Zhu

Sakka

2008

Science and Technology of Advanced Materials

158

104

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“…As discussed with more detail in Section 5, our results indicate that the predicted magnitude of texture is larger than what is measured for a given amount of uniaxial stretch, λ. Seabaugh et al [54] used a weighted March-Dollase expression in which it is assumed the orientation of a volume fraction of particles, 1 − w, is unaffected by the deformation, thus resulting in a weighting of the initial and March pole densities, i.e.,…”

Section: Modified March Theorymentioning

confidence: 99%

Using Neutron Diffraction to Investigate Texture Evolution During Consolidation of Deuterated Triaminotrinitrobenzene (d-TATB) Explosive Powder

et al. 2017

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Triaminotrinitrobenzene (TATB) is a highly anisotropic molecular crystal used in several plastic-bonded explosive (PBX) formulations. A complete understanding of the orientation distribution of TATB particles throughout a PBX charge is required to understand spatially variable, anisotropic macroscale properties of the charge. Although texture of these materials can be measured after they have been subjected to mechanical or thermal loads, measuring texture evolution in situ is important in order to identify mechanisms of crystal deformation and reorientation used to better inform thermomechanical models. Neutron diffraction measurements were used to estimate crystallographic reorientation while deuterated TATB (d-TATB) powder was consolidated into a cylindrical pellet via a uniaxial die-pressing operation at room temperature. Both the final texture of the pressed pellet and the in situ evolution of texture during pressing were measured, showing that the d-TATB grains reorient such that (001) poles become preferentially aligned with the pressing direction. A compaction model is used to predict the evolution of texture in the pellet during the pressing process, finding that the original model overpredicted the texture strength compared to these measurements. The theory was extended to account for initial particle shape and pore space, bringing the results into good agreement with the data.

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“…Scanning electron microscopy (SEM) micrographs of //-cut samples were used to characterize the morphological texture. Crystallographic orientation distribution was obtained from corrected rocking-curve (or -scan) measurements, 5,6 using the (002) SBN53 peak. The orientation distribution was calculated by fitting corrected rocking curves to the March-Dollase equation:…”

Section: Methodsmentioning

confidence: 99%

Erratum

2003

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Fiber textured Sr 0.53 Ba 0.47 Nb 2 O 6 ceramics were reactively sintered to ജ95% of the theoretical density from a mixture of SrNb 2 O 6 and BaNb 2 O 6 powders. Texture in 〈001〉 was obtained by templated grain growth on 〈001〉-oriented acicular KSr 2 Nb 5 O 15 template particles. The most highly textured ceramics had a peak dielectric constant of 23,600 (at T c ‫ס‬ 128°C), a remanent polarization (P r ) of 20.3 C/cm 2 , a saturation polarization (P sat ) of 24 C/cm 2 (69-96% of single crystal), and a piezoelectric charge coefficient (d 33 ) of 84 pC/N (76-93% of single crystal). A model, correlating polarization with grain orientation, predicts that P r increases sharply when a percolating grain network forms to transfer charge between elongated grains.

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Comparison of Texture Analysis Techniques for Highly Oriented α‐Al₂O₃

Cited by 56 publications

References 19 publications

Textured silicon nitride: processing and anisotropic properties

Textured silicon nitride: processing and anisotropic properties

Using Neutron Diffraction to Investigate Texture Evolution During Consolidation of Deuterated Triaminotrinitrobenzene (d-TATB) Explosive Powder

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Comparison of Texture Analysis Techniques for Highly Oriented α‐Al2O3

Cited by 56 publications

References 19 publications

Textured silicon nitride: processing and anisotropic properties

Textured silicon nitride: processing and anisotropic properties

Using Neutron Diffraction to Investigate Texture Evolution During Consolidation of Deuterated Triaminotrinitrobenzene (d-TATB) Explosive Powder

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Comparison of Texture Analysis Techniques for Highly Oriented α‐Al₂O₃