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Thermal stability of nanocrystalline Pd81Zr19 / Brian K. VanLeeuwen in Acta materialia, Vol. 58 N° 12 (Juillet 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4292–4297 Titre : Thermal stability of nanocrystalline Pd81Zr19 Type de document : texte imprimé Auteurs : Brian K. VanLeeuwen, Auteur ; Kristopher A. Darling, Auteur ; Carl C. Koch, Auteur Année de publication : 2011 Article en page(s) : pp. 4292–4297 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Nanocrystalline  materials  Grain  growth  Grain  boundary  energy  Grain  boundary  segregation  Solute  segregation Résumé : Grain growth stability in mechanically alloyed nanocrystalline Pd81Zr19 was investigated. Previous research suggested that the alloy is thermodynamically stable to very high temperatures. When X-ray diffraction (XRD) is used to estimate the grain size of annealed samples the alloy appears to have remarkable resistance to growth. Microscopy done here on the same alloy indicated that the XRD estimates are not accurate for samples annealed above 600 °C. It appears that when this alloy is annealed at high temperatures XRD peak broadening is retained for reasons that are unrelated to the grain size. The alloy still has much improved grain growth stability compared with pure Pd, but not as significant as suggested by the XRD results. A similar phenomenon was observed in Fe–Zr alloys. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002399 [article] Thermal stability of nanocrystalline Pd81Zr19 [texte imprimé] / Brian K. VanLeeuwen, Auteur ; Kristopher A. Darling, Auteur ; Carl C. Koch, Auteur . - 2011 . - pp. 4292–4297. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4292–4297 Mots-clés : Nanocrystalline  materials  Grain  growth  Grain  boundary  energy  Grain  boundary  segregation  Solute  segregation Résumé : Grain growth stability in mechanically alloyed nanocrystalline Pd81Zr19 was investigated. Previous research suggested that the alloy is thermodynamically stable to very high temperatures. When X-ray diffraction (XRD) is used to estimate the grain size of annealed samples the alloy appears to have remarkable resistance to growth. Microscopy done here on the same alloy indicated that the XRD estimates are not accurate for samples annealed above 600 °C. It appears that when this alloy is annealed at high temperatures XRD peak broadening is retained for reasons that are unrelated to the grain size. The alloy still has much improved grain growth stability compared with pure Pd, but not as significant as suggested by the XRD results. A similar phenomenon was observed in Fe–Zr alloys. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002399