Microstructural Stability and Mechanical Properties of Directionally Solidified Alumina/YAG Eutectic Monofilaments |
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| Affiliation: | 1. Materials and Manufacturing Directorate, Air Force Research Laboratory, USAF/AFRL/MLLN, WPAFB, OH 45433, USA;2. University of Dayton, Dayton, Ohio 45469, USA;1. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, School of Materials Science and Engineering, Harbin Institute of Technology, 92 Westdazhi Street, Harbin 150001, China;2. Laboratoire Génie des Matériaux, École Militaire Polytechnique, BP17 Bordj El-Bahri, 16046 Algiers, Algeria;3. Institute of Composite Materials, Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;1. Nano Optoelectronics Laboratory, Advanced Institute for Science and Technology, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hai Ba Trung, Hanoi, Viet Nam;2. Department of Electrical Engineering and Computer Sciences, Graduate School of Engineering, University of Hyogo, Himeji, Hyogo 671-2280, Japan;3. School of Chemical Engineering, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hai Ba Trung, Hanoi, Viet Nam;1. Commissariat à l’Energie Atomique et aux Energies Alternatives, DRT/LITEN/DTNM/SERE/LTE, 17, rue des Martyrs, 38054 Grenoble Cedex 9, France;2. HotBlock On Board, 7, Parvis Louis Néel, 38000 Grenoble, France |
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| Abstract: | Fiber strength retention and creep currently limit the use of polycrystalline oxide fibers in ceramic matrix composites making it necessary to develop single crystal fibers. Two-phase alumina/YAG single crystal structures in the form of monofilaments show that the room temperature tensile strength increases according to the inverse square root of the microstructure size. Therefore, microstructure stability will play a significant role in determining the ‘use temperature’ of these fibers along with its creep resistance. In this work, the effects of temperature on microstructural stability and the creep behavior of directionally solidified alumina/YAG eutectic monofilaments were studied. Microstructural stability experiments were conducted in air from 1200 to 1500°C and creep tests at temperatures of 1400 to 1700°C. Inherent microstructure stability was found to be very good, however, extraneous impurity-induced heterogeneous coarsening was significant above 1400°C. The creep strength of monofilaments with aligned microstructures were superior to ones with low aspect ratio morphologies. Mechanisms for microstructural coarsening and creep behavior are discussed. |
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