Grain size influence on residual stresses in alumina/zirconia composites

Sergo, Valter; Pezzotti, Giuseppe; Sbaizero, Orfeo; Nishida, Toshihiko

doi:10.1016/s1359-6454(97)00348-0

Cited by 54 publications

(45 citation statements)

References 21 publications

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“…[19] These methods provide accurate residual stress measurements without the need for numerical analysis [e.g., finite element analysis (FEA)] yet require specialized equipment (i.e., synchrotron or neutron sources). Other nondestructive methods include ultrasonics, [20] electrical resistivity, [21] magnetic behavior, [22] and piezo-spectroscopy in thin films [23,24] ; these are material and geometry specific. While these methods are largely used ex situ, X-ray diffraction has been used to evaluate other types of process-induced residual stresses in situ (thin films, [25] welded materials [26] and composites [27] ).…”

Section: B Residual Stress Measurement Methodologiesmentioning

confidence: 99%

An Experimental Investigation into Additive Manufacturing-Induced Residual Stresses in 316L Stainless Steel

Brown

Kumar

et al. 2014

Metall Mater Trans A

552

218

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Additive manufacturing (AM) technology provides unique opportunities for producing net-shape geometries at the macroscale through microscale processing. This level of control presents inherent trade-offs necessitating the establishment of quality controls aimed at minimizing undesirable properties, such as porosity and residual stresses. Here, we perform a parametric study into the effects of laser scanning pattern, power, speed, and build direction in powder bed fusion AM on residual stress. In an effort to better understand the factors influencing macroscale residual stresses, a destructive surface residual stress measurement technique (digital image correlation in conjunction with build plate removal and sectioning) has been coupled with a nondestructive volumetric evaluation method (i.e., neutron diffraction). Good agreement between the two measurement techniques is observed. Furthermore, a reduction in residual stress is obtained by decreasing scan island size, increasing island to wall rotation to 45 deg, and increasing applied energy per unit length (laser power/speed). Neutron diffraction measurements reveal that, while in-plane residual stresses are affected by scan island rotation, axial residual stresses are unchanged. We attribute this in-plane behavior to misalignment between the greatest thermal stresses (scan direction) and largest part dimension.

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Section: B Residual Stress Measurement Methodologiesmentioning

confidence: 99%

An Experimental Investigation into Additive Manufacturing-Induced Residual Stresses in 316L Stainless Steel

Brown

Kumar

et al. 2014

Metall Mater Trans A

552

218

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“…At least part of the motivation for the polycrystalline research was to investigate the stress fields arising in polycrystalline alumina responsible for microcracking-the spontaneous localized cracking that occurs in polycrystalline alumina on cooling as a consequence of the anisotropic structure and thermal expansion of corundum [39][40][41]. From the 1990s onward, although there were many notable fundamental studies of the phenomenon [42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58], the shift in energy of R lines with stress was largely confined to the applied domain, detailed in numerous works, such as: measurement of stress in bulk Al2O3 polycrystals [42,[58][59][60][61][62][63][64][65][66][67]; in bulk Al2O3-ZrO2 composites [68][69][70][71][72][73][74][75][76][77][78]; in sapphire or composite fibers, free or in matrices [79][80]…”

mentioning

confidence: 99%

Review: Coefficients for Stress, Temperature, and Composition Effects in Fluorescence Measurements of Alumina

Cook

Michaels

2017

J. RES. NATL. INST. STAN.

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The numerical coefficients linearly relating the effects of stress (including pressure), temperature, and composition to shifts in the energies of the Cr-related fluorescence in alumina (Al2O3) are reviewed. The primary focus is the shift of the R1 and R2 “ruby” fluorescence lines under conditions typical for stress determination in polycrystalline Al2O3. No significant experimental difference in the R1 and R2 responses is observed for hydrostatic stress (or pressure) conditions (average shift coefficient of about 7.6 cm−1/GPa), changes in temperature (about 0.140 cm−1/K), or variations in composition (about 120 cm−1/mass fraction of Cr). There are significant differences in the R1 and R2 responses for nonhydrostatic stress conditions. In particular, for uniaxial stress along the a and c directions in the Al2O3 crystal, the R1 piezospectroscopic tensor coefficients (about 3.0 cm−1/GPa and 1.6 GPa cm−1/GPa, respectively) differ considerably, whereas the R2 coefficients (about 2.6 cm−1/GPa and 2.3 GPa cm−1/GPa, respectively) do not. Measurements of the piezospectroscopic tensor coefficients are shown to have interlaboratory relative consistency of about 4 % extending over 30 years, and are consistent with the scalar high-pressure measurements. Measurements of the temperature coefficients are shown to have interlaboratory relative consistency less than 1 % extending over 60 years. Fluorescence-based measurements of stress in polycrystalline Al2O3, although requiring temperature adjustment, are shown to have a relative uncertainty of about 2.5 %.

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“…On the other hand, the crystallite (grain) size and the surface roughness of the film are strongly affected by the surface roughness of substrate. Note that the variation of the former is small (from 34 nm to 46 nm, those difference range may be caused by the residual stress during sputtering [45]), while the later is quite large (from 3 nm to 53 nm). Further, the variation of the average surface roughness (film) and the photocatalytic ability is similar to each other ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Effect of substrate roughness and working pressure on photocatalyst of N-doped TiO films prepared by reactive sputtering with air

Lee

Yamasue

Okumura

et al. 2015

Applied Surface Science

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Grain size influence on residual stresses in alumina/zirconia composites

Cited by 54 publications

References 21 publications

An Experimental Investigation into Additive Manufacturing-Induced Residual Stresses in 316L Stainless Steel

An Experimental Investigation into Additive Manufacturing-Induced Residual Stresses in 316L Stainless Steel

Review: Coefficients for Stress, Temperature, and Composition Effects in Fluorescence Measurements of Alumina

Effect of substrate roughness and working pressure on photocatalyst of N-doped TiO films prepared by reactive sputtering with air

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