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Tensile Strength and Microstructure of Al2O3-ZrO2 Hypo-Eutectic Fibers StudiedOxide eutectics offer high-temperature strength retention and creep resistance in oxidizing environments. Al2O3-ZrO2 eutectic strengths have been studied since the 1970's. Directionally solidified oxide eutectics exhibit improved resistance to slow crack growth and excellent strength retention at high temperatures up to 1400 C. Materials studied typically contain Y2O3 to metastably retain the high-temperature cubic and tetragonal polymorphs at room temperature. Al2O3-ZrO2 is of fundamental interest for creep studies because it combines a creep-resistant material, Al2O3, with a very low creep resistance material, ZrO2. Results on mechanical properties and microstructures of these materials will be used to define compositions for creep testing in future work. Substantial variations from the eutectic alumina to zirconia ratio can be tolerated without a loss in room-temperature strength. The effect of increasing Y2O3 addition on the room-temperature tensile strength of an Al2O3-ZrO2 material containing excess Al2O3 was examined at the NASA Glenn Research Center, where the materials were grown using Glenn's world-class laser growth facilities.
Document ID
20050201786
Acquisition Source
Glenn Research Center
Document Type
Other
Authors
Farmer, Serene C.
(NASA Glenn Research Center Cleveland, OH, United States)
Sayir, Ali
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 23, 2013
Publication Date
March 1, 2001
Publication Information
Publication: Research and Technology 2000
Subject Category
Structural Mechanics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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