Mechanical thermal synthesis of in situ Al based hybrid nanocomposites in Al–Ni–Ti–O system
| Autor: | B.S.B. Reddy, Siddhartha Das, J.J.S. Dilip, Karabi Das |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
In situ reinforcements XRD X ray diffraction Mineralogy Aluminothermic reduction Activation energy Thermal treatment Thermal activation Green compacts Heat treatment Indentation hardness Nanocomposites Ball milling TiO Differential thermal analysis Materials Chemistry High energy physics Distance measurement Ball mill Powder blends Hybrid nanocomposites Nanocomposite X ray powder diffraction Mechanical Engineering Metal matrix composite Non-blocking I/O Metals and Alloys In-situ Thermoanalysis High-energy ball milling Chemical activation matrix Milling machines Ultra-fine grain size Milled powders Reinforced plastics Chemical engineering Reaction temperature Mechanics of Materials Synthesis (chemical) Thermal synthesis Nano-sized Milling (machining) Milling time Aluminum |
| Zdroj: | Journal of Alloys and Compounds. 490:103-109 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2009.09.166 |
| Popis: | Al matrix hybrid nanocomposite is synthesized from a powder blend of Al-12% (wt) NiO-15% (wt) TiO2 by combined mechanical and thermal activation (mechanical thermal synthesis). The powder blends are mechanically activated by high energy ball milling followed by consolidation and thermal treatment. Milled powders are characterized by differential thermal analysis (DTA), X-ray diffraction (XRD) and electron microscopy. DTA results show the onset reaction temperature to decrease with increase in the milling time. Series of thermal treatments in a wide range of temperatures are performed on the green compacts. The thermally treated samples are then characterized by XRD and electron microscopy. The superior microhardness (1.86-2.25 GPa) of the nanocomposite may be attributed to ultra fine grain size of the Al matrix, and Orowan strengthening from the nanosized reinforcements. Aluminothermic reduction reaction between Al, NiO and TiO2 is successfully exploited for the synthesis of in situ hybrid nanocomposite by combined mechanical-thermal activation. � 2009 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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