Nanocrystalline Al Composites from Powder Milled under Ammonia Gas Flow
The production of high hardness and thermally stable nanocrystalline aluminium composites is described. Al powder was milled at room temperature in an ammonia flow for a period of less than 5 h. NH3 dissociation during milling provokes the absorption, at a high rate, of nitrogen into aluminium, hard...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2014/617241 |
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| author | J. Cintas E. S. Caballero J. M. Montes F. G. Cuevas C. Arevalo |
| author_facet | J. Cintas E. S. Caballero J. M. Montes F. G. Cuevas C. Arevalo |
| author_sort | J. Cintas |
| collection | DOAJ |
| description | The production of high hardness and thermally stable nanocrystalline aluminium composites is described. Al powder was milled at room temperature in an ammonia flow for a period of less than 5 h. NH3 dissociation during milling provokes the absorption, at a high rate, of nitrogen into aluminium, hardening it by forming a solid solution. Controlled amounts of AlN and Al5O6N are formed during the subsequent sintering of milled powders for consolidation. The pinning action of these abundant dispersoids highly restrains aluminium grain growth during heating. The mean size of the Al grains remains below 45 nm and even after the milled powder is sintered at 650°C for 1 h. |
| format | Article |
| id | doaj-art-7ded347dc11f425f8e41a30b128a1c15 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-7ded347dc11f425f8e41a30b128a1c152025-02-03T01:02:10ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422014-01-01201410.1155/2014/617241617241Nanocrystalline Al Composites from Powder Milled under Ammonia Gas FlowJ. Cintas0E. S. Caballero1J. M. Montes2F. G. Cuevas3C. Arevalo4Metallurgy and Materials Engineering Group, Escuela Técnica Superior de Ingeniería, University of Seville, Camino de los Descubrimientos s/n, 41092 Sevilla, SpainMetallurgy and Materials Engineering Group, Escuela Técnica Superior de Ingeniería, University of Seville, Camino de los Descubrimientos s/n, 41092 Sevilla, SpainMetallurgy and Materials Engineering Group, Escuela Técnica Superior de Ingeniería, University of Seville, Camino de los Descubrimientos s/n, 41092 Sevilla, SpainDepartment of Chemistry and Materials Science, Escuela Técnica Superior de Ingeniería, University of Huelva, Campus La Rábida, Carretera Palos s/n, Palos de la Frontera, 21819 Huelva, SpainMetallurgy and Materials Engineering Group, Escuela Técnica Superior de Ingeniería, University of Seville, Camino de los Descubrimientos s/n, 41092 Sevilla, SpainThe production of high hardness and thermally stable nanocrystalline aluminium composites is described. Al powder was milled at room temperature in an ammonia flow for a period of less than 5 h. NH3 dissociation during milling provokes the absorption, at a high rate, of nitrogen into aluminium, hardening it by forming a solid solution. Controlled amounts of AlN and Al5O6N are formed during the subsequent sintering of milled powders for consolidation. The pinning action of these abundant dispersoids highly restrains aluminium grain growth during heating. The mean size of the Al grains remains below 45 nm and even after the milled powder is sintered at 650°C for 1 h.http://dx.doi.org/10.1155/2014/617241 |
| spellingShingle | J. Cintas E. S. Caballero J. M. Montes F. G. Cuevas C. Arevalo Nanocrystalline Al Composites from Powder Milled under Ammonia Gas Flow Advances in Materials Science and Engineering |
| title | Nanocrystalline Al Composites from Powder Milled under Ammonia Gas Flow |
| title_full | Nanocrystalline Al Composites from Powder Milled under Ammonia Gas Flow |
| title_fullStr | Nanocrystalline Al Composites from Powder Milled under Ammonia Gas Flow |
| title_full_unstemmed | Nanocrystalline Al Composites from Powder Milled under Ammonia Gas Flow |
| title_short | Nanocrystalline Al Composites from Powder Milled under Ammonia Gas Flow |
| title_sort | nanocrystalline al composites from powder milled under ammonia gas flow |
| url | http://dx.doi.org/10.1155/2014/617241 |
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