Microstructural refinement and mechanical response of Al2O3–ZrO2 eutectics fabricated by a novel pulse discharge plasma assisted melting method |
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| Affiliation: | 1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;2. AECC Guizhou Liyang Aviation Power Co., LTD, Guiyang, 550000, China;3. School of Materials and Metallurgical Engineering, Inner Mongolia University of Science & Technology, Baotou, 014010, China;4. Yantai Research Institute and Graduate School of Harbin Engineering University, Yantai, 264006, China |
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| Abstract: | In the present work, microstructural refinement and mechanical response of Al2O3–ZrO2 eutectics fabricated by a pulse discharge plasma assisted melting (PDPAM) method were investigated. The solidified microstructure evolves from polygonal eutectic colonies into irregular cellular colonies with increasing the superheating temperature of the melt from 1820 °C to 1900 °C. The average eutectic spacing inside the colonies decreases from 1.80 ± 0.10 μm to 0.25 ± 0.06 μm, and the coarse inter-colonial structure is refined, which is attributed to the increase in undercooling temperature. High-temperature microstructural stability of Al2O3–ZrO2 eutectics is improved significantly as contrasted with the as-sintered ceramics. Besides, the load dependence of Vickers hardness for Al2O3–ZrO2 eutectics is investigated. |
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| Keywords: | Pulse discharge plasma Microstructure Mechanical properties |
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