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Détail de l'auteur
Auteur R. Raj
Documents disponibles écrits par cet auteur
Affiner la rechercheColossal anelasticity in polycrystals deforming under conditions of diffusional creep / P. Lee in Acta materialia, Vol. 58 N° 2 (Janvier 2010)
[article]
in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 702-708
Titre : Colossal anelasticity in polycrystals deforming under conditions of diffusional creep Type de document : texte imprimé Auteurs : P. Lee, Auteur ; R. Raj, Auteur Article en page(s) : pp. 702-708 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Anelasticity Diffusional creep Grain size distribution Index. décimale : 669 Métallurgie Résumé : Since diffusional creep viscosity depends strongly on the grain size, a variability in the grain size in a polycrystal can generate significant internal stresses.
Upon unloading, the non-uniform internal stresses recover, leading to anelastic strains.
The anelastic strains can be very large, approaching 100 times the elastic strains.
We solve the case of bimodal viscosity in closed form to highlight the features of this type of anelasticity.
The results are compared to the anelastic behavior of two-phase superplastic alloys.
In such alloys the spatial variability in the diffusional viscosity can arise from the variability in the activation energy of grain boundary diffusion, which, because of its Arrhenius nature, can produce a much higher degree of variability than the grain size.DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Colossal anelasticity in polycrystals deforming under conditions of diffusional creep [texte imprimé] / P. Lee, Auteur ; R. Raj, Auteur . - pp. 702-708.
Métallurgie
Langues : Anglais (eng)
in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 702-708
Mots-clés : Anelasticity Diffusional creep Grain size distribution Index. décimale : 669 Métallurgie Résumé : Since diffusional creep viscosity depends strongly on the grain size, a variability in the grain size in a polycrystal can generate significant internal stresses.
Upon unloading, the non-uniform internal stresses recover, leading to anelastic strains.
The anelastic strains can be very large, approaching 100 times the elastic strains.
We solve the case of bimodal viscosity in closed form to highlight the features of this type of anelasticity.
The results are compared to the anelastic behavior of two-phase superplastic alloys.
In such alloys the spatial variability in the diffusional viscosity can arise from the variability in the activation energy of grain boundary diffusion, which, because of its Arrhenius nature, can produce a much higher degree of variability than the grain size.DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]