In-situ Al-based bulk nanocomposites by solid-state aluminothermic reaction in Al–Ti–O system
| Autor: | B.S.B. Reddy, J.J.S. Dilip, Siddhartha Das, Karabi Das |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Metals and Alloys Intermetallic Thermal treatment Nanocrystalline material law.invention Chemical engineering Mechanics of Materials law Powder metallurgy Differential thermal analysis Aluminothermic reaction Materials Chemistry Ball mill Powder mixture |
| Zdroj: | Journal of Alloys and Compounds. 475:178-183 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2008.07.061 |
| Popis: | The paper reports the study on the synthesis and characterization of nanocomposites reinforced with in-situ intermetallic compounds via mechanical–thermal activation. The Al matrix bulk hybrid nanocomposites are synthesized by an aluminothermic reduction reaction between the nanocrystalline Al and TiO 2 powder blends. The nanocrystalline powder mixture of Al and TiO 2 is synthesized by high-energy ball milling. The milled powders are characterized by differential thermal analysis (DTA), X-ray diffraction (XRD) and electron microscopy. The powder compacts after thermal treatment are characterized by XRD and electron microscopy. The microhardness of the in-situ composite is in the range 3.4–4.2 GPa and it is probably attributed to the nanosized reinforcements and ultrafine grain structure of the Al matrix. A suitable combination of the mechanical milling and thermal treatment can lead to the synthesis of Al-based nanocomposites by the solid-state processing route for the present system. |
| Databáze: | OpenAIRE |
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