Grain and grain boundary activities observed in alumina–zirconia–magnesia spinel nanocomposites by in situ nanoindentation using transmission electron microscopy
| Autor: | Xinghang Zhang, Ickchan Kim, Amiya K. Mukherjee, Dustin M. Hulbert, Dongtao Jiang, Joon Hwan Lee, Haiyan Wang |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Polymers and Plastics Spinel Metallurgy Metals and Alloys Spark plasma sintering engineering.material Nanoindentation Microstructure Electronic Optical and Magnetic Materials Transmission electron microscopy visual_art Ceramics and Composites engineering visual_art.visual_art_medium Grain boundary Ceramic Composite material Grain Boundary Sliding |
| Zdroj: | Acta Materialia. 58:4891-4899 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2010.05.027 |
| Popis: | At room temperature, in situ nanoindentation experiments in a transmission electron microscope reveal the grain and grain boundary activities in fully dense ceramic nanocomposites composed of Al 2 O 3 :ZrO 2 :MgAl 2 O 4 (AZM) processed by spark plasma sintering (SPS). The composites have a bi-modal grain size distribution, where the larger grains (500 nm−1 μm in diameter) consist of Al 2 O 3 and MgAl 2 O 4 grains, and the smaller grains (100–300 nm in diameter) are primarily ZrO 2 . In situ dynamic deformation studies show that the AZM nanocomposites undergo the deformation mainly through the grain-boundary sliding and rotation of small grains, i.e. ZrO 2 grains, and some of the large grains, i.e. MgAl 2 O 4 grains. We observed both plastic and elastic deformations in different sample regions in these multi-phase ceramic nanocomposites at room temperature. |
| Databáze: | OpenAIRE |
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