Microstructural Stability and Creep Behavior of Directionally Solidified MgAl2O4/Y3Al5O12 Eutectic Composite

Serkan Abali

doi:10.4028/www.scientific.net/AMM.752-753.189

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 752-753Microstructural Stability and Creep Behavior of...

Microstructural Stability and Creep Behavior of Directionally Solidified MgAl₂O₄/Y₃Al₅O₁₂ Eutectic Composite

Abstract:

In the present work, compressive creep characteristics of directionally solidified MAS-YAG (MgAl₂O₄/Y₃Al₅O₁₂) were investigated at high temperature. The compressive creep strength of a crystal grown at a rate of 5 mm/min and a flow rate of 1.2 mm/min at 1500 °C under a strain rate of 1.0 × 10^-4 was only 400 MPa, which is slightly higher than that of crystals grown under different conditions. The compressive creep strength of an oxide eutectic fabricated by the directional solidification method is higher than that of a polycrystalline sintered eutectic with the same composition. The creep behavior at high temperature was studied and the mechanisms of deformation by dislocation motion were revealed by Transmission Electron Microscopy (TEM) observations.

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Periodical:

Applied Mechanics and Materials (Volumes 752-753)

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189-193

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https://doi.org/10.4028/www.scientific.net/AMM.752-753.189

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Online since:

April 2015

Authors:

Serkan Abali*

Keywords:

Creep Characteristics, Microstructure, Spinel, Yttrium Aluminum Garnet, Zone Melting Process

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