Sliding wear of nanocrystalline Ni–W / Timothy J. Rupert in Acta materialia, Vol. 58 N° 12 (Juillet 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4137–4148 Titre : Sliding wear of nanocrystalline Ni–W : Structural evolution and the apparent breakdown of Archard scaling Type de document : texte imprimé Auteurs : Timothy J. Rupert, Auteur ; Christopher A. Schuh, Auteur Année de publication : 2011 Article en page(s) : pp. 4137–4148 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Nanocrystalline materials Wear Mechanical properties Ni–W alloys Grain boundary migration Résumé : Sliding wear of nanocrystalline Ni–W alloys with grain sizes of 3–47 nm, a range which spans the transition in deformation mechanisms from intra- to inter-granular, has been studied through pin-on-disk wear testing. The extreme conditions produced during sliding wear are found to result in structural evolution and a deviation from Archard scaling for the finest grain sizes; in the finest nanocrystalline materials wear resistance is higher than would be expected based on hardness alone. The repetitive sliding load is found to lead to a modest amount of grain growth and grain boundary relaxation, which in turn leads to local hardening in the wear track. Analysis of the dynamic microstructure suggests that it is produced primarily as a result of local plasticity and is not principally due to frictional heating. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002119 [article] Sliding wear of nanocrystalline Ni–W : Structural evolution and the apparent breakdown of Archard scaling [texte imprimé] / Timothy J. Rupert, Auteur ; Christopher A. Schuh, Auteur . - 2011 . - pp. 4137–4148. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4137–4148 Mots-clés : Nanocrystalline materials Wear Mechanical properties Ni–W alloys Grain boundary migration Résumé : Sliding wear of nanocrystalline Ni–W alloys with grain sizes of 3–47 nm, a range which spans the transition in deformation mechanisms from intra- to inter-granular, has been studied through pin-on-disk wear testing. The extreme conditions produced during sliding wear are found to result in structural evolution and a deviation from Archard scaling for the finest grain sizes; in the finest nanocrystalline materials wear resistance is higher than would be expected based on hardness alone. The repetitive sliding load is found to lead to a modest amount of grain growth and grain boundary relaxation, which in turn leads to local hardening in the wear track. Analysis of the dynamic microstructure suggests that it is produced primarily as a result of local plasticity and is not principally due to frictional heating. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002119

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