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Size effects on material yield strength/deformation/fracturing properties

Published online by Cambridge University Press:  30 January 2019

Ronald W. Armstrong Open the ORCID record for Ronald W. Armstrong [Opens in a new window]
Ronald W. Armstrong*
Affiliation:
Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effects of specimen size, Hall–Petch (H-P) grain or subgrain size, particle size plus spacing, and crack size on the yield strength, plastic deformation, and fracturing properties of crystalline materials are described on a dislocation mechanics basis. The size effects are assessed at relevant macro- and/or micro-and/or nano-scale dimensions; in the latter case, at the upper-limiting strength levels. The description is applied mostly to face-centered cubic (FCC), body-centered cubic (BCC), and hexagonal close-packed (HCP) metals but also involves grain size/particle size–dependent (composite) steel material behaviors. Competition is described for the role of dislocation pile-ups versus hole-joining mechanisms for ductile failure. Grain size–dependent microhardness and strain rate sensitivity measurements are presented for nano-grain size strengthening and grain size weakening, respectively. An intrinsic size effect is demonstrated for silicon crystal nano-indentation hardness testing, which, on microscale loading, leads to evaluation of crack size dependence and, for polycrystalline alumina, to associated H-P behavior for the fracture mechanics stress intensity.

Keywords

strengthgrain sizedislocations
Type
Invited Review
Information
Journal of Materials Research , Volume 34 , Issue 13: Focus Issue: Intrinsic and Extrinsic Size Effects in Materials , 15 July 2019 , pp. 2161 - 2176
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

This section of Journal of Materials Research is reserved for papers that are reviews of literature in a given area.

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