Hall-Petch relationship in nanocrystalline Ni and Be-B alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)377-385
Journal / PublicationIntermetallics
Volume13
Issue number3-4
Publication statusPublished - Mar 2005
Externally publishedYes

Abstract

An overview of the plastic deformation of crystalline solids with different grain sizes are presented. Special emphases are on materials with a grain size less than ∼20 nm. This is the region where the classical Hall-Petch (H-P) relationship breakdowns (or the inverse H-P relationship) are often reported. In the present paper, two alloy systems, pure nickel and Be-B binary alloys, are studied and the results discussed. The nanocrystalline nickel and Be-B alloys were produced by electrodeposition and sputter deposition, respectively. In the case of n-Ni, we used both nanohardness and nanoscratch experiments to demonstrate successfully a H-P breakdown at a grain size of about 14 nm. In the case of Be-B alloys, we illustrated that an apparent H-P breakdown is, in fact, an artifact. The apparent inverse HP relation was actually caused by the presence of relatively soft amorphous Be-B phases when the grain size of Be was significantly refined by B alloying. © 2004 Elsevier Ltd. All rights reserved.

Research Area(s)

  • B. Glasses, metallic, B. Phase diagrams, C. Coatings, intermetallic and otherwise

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Hall-Petch relationship in nanocrystalline Ni and Be-B alloys. / Nieh, T. G.; Wang, J. G.

In: Intermetallics, Vol. 13, No. 3-4, 03.2005, p. 377-385.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review