期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 37, 期 4, 页码 1617-1626出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2016.11.041
关键词
Directionally solidified eutectic; Microstructure; Mechanical properties; Oxide ceramics; Solidification behaviour
资金
- National Natural Science Foundation of China [51472200, 51272211, 51002122, 51690163]
- Aeronautical Science Foundation of China [2015ZF53067]
- Research Fund of Equipment Development Department [6140759040116HK03001]
- Project of Shaanxi Provincial Youth Science and Technology Star Plan [2015KJXX-08]
- Research Fund of the State Key Laboratory of Solidification Processing in NWPU [93-QZ-2014, 132-QP-2015]
- Fundamental Research Funds for the Central Universities [3102015BJ024]
Directionally solidified Al2O3/GdAlO3 eutectic ceramic rods with high densities and low solidification defects are prepared by laser floating zone melting at solidification rate from 2 to 200 mu m/s. The microstructure evolution, eutectic growth behavior and mechanical properties are investigated. At low solidification rates (<30 mu m/s), the eutectic rods present a homogeneous irregular eutectic microstructure, whereas cellular microstructure containing regular lamella/rod structure is developed at higher solidification rates. The relationship is established between the eutectic interphase spacing and solidification rate, which follows the Magnin-Kurz eutectic model. The Vickers hardness (15.9-17.3 GPa) increases slightly with decreasing interphase spacing, but the fracture toughness (4.08 MPa m(1/2)) shows little dependence with the solidification rate. Different crack propagation mechanisms are revealed among the indentation cracks. The flexural strength at ambient temperature reaches up to 1.14 GPa for the eutectic grown at 100 mu m/s. The fracture surface analysis indicates that the surface defects are the main crack source. (C) 2016 Elsevier Ltd. All rights reserved.
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