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The Effect of Microstructure on Mechanical Properties of Directionally Solidified Al2o3/Zro2(y2o3) Eutectic
Ali Sayir,Serene C. Farmer +1 more
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TLDR
In this paper, the authors report the results of experiments aimed at identifying the sources of high temperature creep resistance and high levels of strength in a two phase Al2O3/ZrO2(Y 2O3) system.Abstract:
The eutectic architecture of a continuous reinforcing phase within a higher volume fraction phase or matrix, can be described as a naturally occurring in-situ composite. Here we report the results of experiments aimed at identifying the sources of high temperature creep resistance and high levels of strength in a two phase Al2O3/ZrO2(Y2O3) system. The mechanical properties of two phase Al2O3/ZrO2(Y2O3) eutectic are superior to that of either constituent alone due to strong constraining effects provided by the coherent interfaces and micrsostructure. The Al2O3/ZrO2(Y2O3) eutectic maintains a low energy interface resulting from directional solidification and can produce strong and stable reinforcing phase/matrix bonding. The phases comprising a eutectic are thermodynamically compatible at higher homologous temperatures than man-made composites and as such offer the potential for superior high temperature properties.read more
Citations
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Ultra‐High‐Strength Nanofibrillar Al2O3–YAG–YSZ Eutectics
Patricia B. Oliete,Jose I. Peña,Angel Larrea,Victor M. Orera,Javier LLorca,Jose Ygnacio Pastor,A. Martín,Javier Segurado +7 more
Journal ArticleDOI
Phase equilibria in the refractory oxide systems of zirconia, hafnia and yttria with rare-earth oxides
TL;DR: In this article, a systematic study of phase equilibria in the ternary systems HfO2(ZrO2)−Y2O3−Ln2O 3 and ZrO 2−Y 2O3 −Ln 2O 3 has been carried out.
Journal ArticleDOI
Processing, microstructure and mechanical properties of directionally-solidified Al2O3–Y3Al5O12–ZrO2 ternary eutectics
Jose I. Peña,M. Larsson,Rosa I. Merino,I. de Francisco,Victor M. Orera,Javier LLorca,Jose Ygnacio Pastor,A. Martín,Javier Segurado +8 more
TL;DR: The fine and homogeneous microstructure of the ternary eutectic rods led to an outstanding flexure strength of 2.3 GPa at ambient temperature, which was retained up to 1473 K, and then decreased rapidly to 1.2 GPa as mentioned in this paper.
Journal ArticleDOI
Influence of the Y2O3 Content and Temperature on the Mechanical Properties of Melt-Grown Al2O3–ZrO2 Eutectics
Javier LLorca,Jose Ygnacio Pastor,P. Poza,Jose I. Peña,Isabel de Francisco,Angel Larrea,Victor M. Orera +6 more
TL;DR: In this article, the effect of Y 2 O 3 content on the flexure strength of melt-grown ZrO 2 eutectics was studied in a temperature range of 25°-1427°C.
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Nanostructured Al2O3-YAG-ZrO2 ternary eutectic components prepared by laser engineered net shaping
TL;DR: In this article, a 3D printing approach for fabricating ternary eutectic ceramics (Al2O3-YAG-ZrO2, or AYZ in short) using laser engineered net shaping (LENS) technique was proposed.
References
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Creep resistance of CMSX-3 nickel base superalloy single crystals
Tresa M. Pollock,A.S. Argon +1 more
TL;DR: In this paper, the authors studied the effect of dislocation-free nickel base superalloy single crystals with high volume fractions of the γ′ phase on their deformation and found that the dislocation free precipitates are resistant to shearing by dislocations.
Journal ArticleDOI
Eutectic Solidification in Ceramic Systems
V. S. Stubican,R. C. Bradt +1 more
TL;DR: In this paper, the structure and properties of directionally solidified metallic eutectics have been studied and a large amount of research has been devoted to the structure of these materials.
Book
Computer-aided design of high-temperature materials
TL;DR: In this paper, the authors collected recent work from experimental and computational scientists on high-temperature materials and emphasized the potential for collaboration, including fundamental phenomena and properties; measurements and modeling of interfacial phenomena, stresses, growth of defects, strain, and fracture; and electronic structure and molecular dynamics.
Journal ArticleDOI
Residual stresses in high-temperature ceramic eutectics
TL;DR: In this paper, the residual thermal stresses in directionally solidified ceramic eutectics, a class of materials that has much promise for high-temperature structural applications, are investigated.