Influence of Milling Atmosphere on the Controlled Formation of Ultrafine Dispersoids in Al-Based MMCs
| Autor: | Francisco Gómez Cuevas, Eduardo Sánchez Caballero, Jesús Cintas Físico, Fátima Ángela Ternero Fernández, Juan Manuel Montes Martos |
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| Přispěvatelé: | Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte, Ministerio de Economía y Competitividad (MINECO). España |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
lcsh:TN1-997
Materials science Sintering 02 engineering and technology Vacuum sintering 01 natural sciences Atmosphere Ammonia chemistry.chemical_compound 0103 physical sciences General Materials Science lcsh:Mining engineering. Metallurgy Milling 010302 applied physics Pressing Al-based MMCs milling sintering N-base dispersoids Ammonia gas Metallurgy Metals and Alloys 021001 nanoscience & nanotechnology chemistry Aluminium powder 0210 nano-technology |
| Zdroj: | idUS. Depósito de Investigación de la Universidad de Sevilla instname Metals, Vol 6, Iss 9, p 224 (2016) Metals; Volume 6; Issue 9; Pages: 224 Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Popis: | Properties of compacts made from aluminium powder, milled under different atmospheres, were evaluated. The duration of all the milling processes was 10 h, although different atmospheres were tested: vacuum, confined ammonia, and vacuum combined with a short-time ammonia gas flow (5 min). Milled powders were consolidated by cold uniaxial pressing and vacuum sintering.The nature and content of the second phases change with the milling atmosphere, allowing the modification of the mechanical properties of the compacts. Results showed that hardness and tensile strength were highly dependent on the milling atmosphere. Milling carried out in vacuum with a short-time ammonia gas flow notably improved compacts’ properties, as compared with 10 h vacuum milling. Hardness increased from 96 to 150 HB, and ultimate tensile strength rose from 247 to 476 MPa Financial support of the Ministerio de Economia y Competitividad (Spain) through the research projects DPI2015-69550-C2-1-P and DPI2015-69550-C2-2-P is gratefully acknowledged. We also thank the Microscopy Service of CITIUS (University of Seville). |
| Databáze: | OpenAIRE |
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