Processing, microstructure and mechanical properties of directionally-solidified Al2O3–Y3Al5O12–ZrO2 ternary eutectics

Peña, José; Larsson, Magnus; Merino, Rosa I.; Francisco, I. de; Orera, V. M.; LLorca, J.; Pastor, J.Y.; Martı́n, A.; Segurado, J.

doi:10.1016/j.jeurceramsoc.2005.11.005

Cited by 118 publications

(77 citation statements)

References 28 publications

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“…As the laser scanning rate increases from 100 to 400 m/s, the interphase spacing is rapidly decreased as fine as 0.15 m. The result is in good agreement with that reported by Pena et al [15]. The fine lamellar structure primarily results from the rapid solidification method used.…”

Section: Methodssupporting

confidence: 92%

Growth characteristics of directionally solidified Al2O3/YAG/ZrO2 ternary hypereutectic in situ composites under ultra-high temperature gradient

Zhang

Liu

et al. 2011

Int J Miner Metall Mater

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Oxide eutectic ceramic in situ composites have attracted significant interest in the application of high-temperature structural materials because of their excellent high-temperature strength, oxidation and creep resistance, as well as outstanding microstructural stability. The directionally solidified ternary Al 2 O 3 /YAG/ZrO 2 hypereutectic in situ composite was successfully prepared by a laser zone remelting method, aiming to investigate the growth characteristic under ultra-high temperature gradient. The microstructures and phase composition of the as-solidified hypereutectic were characterized by using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The results show that the composite presents a typical hypereutectic lamellar microstructure consisting of fine Al 2 O 3 and YAG phases, and the enriched ZrO 2 phases with smaller sizes are randomly distributed at the Al 2 O 3 /YAG interface and in Al 2 O 3 phases. Laser power and scanning rate strongly affect the sample quality and microstructure characteristic. Additionally, coarse colony microstructures were also observed, and their formation and the effect of temperature gradient on the microstructure were discussed.

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Section: Methodssupporting

confidence: 92%

Growth characteristics of directionally solidified Al2O3/YAG/ZrO2 ternary hypereutectic in situ composites under ultra-high temperature gradient

Zhang

Liu

et al. 2011

Int J Miner Metall Mater

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“…The observed crack propagation modes will be correlated to the internal stress calculations [27]. In ceramic eutectics, residual internal stresses measurements have already been performed using either X-ray [28,29] or neutron [30] diffraction techniques and Raman spectroscopy [31,32]. These residual stresses significantly affect the mechanical behavior of the material.…”

Section: Residual Stressesmentioning

confidence: 95%

The bending strength temperature dependence of the directionally solidified eutectic LaB6–ZrB2 composite

Bogomol

Nishimura

Nesterenko

et al. 2011

Journal of Alloys and Compounds

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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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Processing, microstructure and mechanical properties of directionally-solidified Al2O3–Y3Al5O12–ZrO2 ternary eutectics

Cited by 118 publications

References 28 publications

Growth characteristics of directionally solidified Al2O3/YAG/ZrO2 ternary hypereutectic in situ composites under ultra-high temperature gradient

Growth characteristics of directionally solidified Al2O3/YAG/ZrO2 ternary hypereutectic in situ composites under ultra-high temperature gradient

The bending strength temperature dependence of the directionally solidified eutectic LaB6–ZrB2 composite

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

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