The thermal explosion synthesis of AlNi monitored by neutron thermodiffractometry / X. Turrillas in Acta materialia, Vol. 58 N° 7 (Avril 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2769–2777 Titre : The thermal explosion synthesis of AlNi monitored by neutron thermodiffractometry Type de document : texte imprimé Auteurs : X. Turrillas, Auteur ; M.J. Mas-Guindal, Auteur ; T.C. Hansen, Auteur Année de publication : 2011 Article en page(s) : pp. 2769–2777 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Nickel aluminides Neutron diffraction Nucleation and growth Thermodiffraction Résumé : The synthesis of AlNi from thermally activated equimolar powder mixtures of aluminium and nickel was monitored in situ and acquired diffraction patterns every 2 s or less. The analysis of diffraction patterns View the MathML source permitted establishment of its kinetics, which could be modeled according to an equation expressed as kt=[α/(1-α)]3/2. From 1530 to View the MathML source an activation energy of 9 ± 2 kJ mol−1 was estimated. Also, the crystallite size evolution on cooling was established to vary from ≈14 nm at 1530 °C to ≈28 nm at 180 °C. Finally, the reaction was found to occur through the melting of aluminium and the subsequent dissolving of nickel to form the polycrystalline single-phase product, AlNi. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000273 [article] The thermal explosion synthesis of AlNi monitored by neutron thermodiffractometry [texte imprimé] / X. Turrillas, Auteur ; M.J. Mas-Guindal, Auteur ; T.C. Hansen, Auteur . - 2011 . - pp. 2769–2777. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2769–2777 Mots-clés : Nickel aluminides Neutron diffraction Nucleation and growth Thermodiffraction Résumé : The synthesis of AlNi from thermally activated equimolar powder mixtures of aluminium and nickel was monitored in situ and acquired diffraction patterns every 2 s or less. The analysis of diffraction patterns View the MathML source permitted establishment of its kinetics, which could be modeled according to an equation expressed as kt=[α/(1-α)]3/2. From 1530 to View the MathML source an activation energy of 9 ± 2 kJ mol−1 was estimated. Also, the crystallite size evolution on cooling was established to vary from ≈14 nm at 1530 °C to ≈28 nm at 180 °C. Finally, the reaction was found to occur through the melting of aluminium and the subsequent dissolving of nickel to form the polycrystalline single-phase product, AlNi. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000273

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