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Enhanced yield strength of materials -the thinness effect.

Jennett, N M; Ghisleri, R*; Michler, J* (2009) Enhanced yield strength of materials -the thinness effect. Appl. Phys. Lett., 95 (12). 123102

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We show that yield strength is determined by `thinness' i.e. by the smallest dimension of a structure. Compressing wall-like structures of different length to width ratio, using a NanoindenterXP, has allowed us to distinguish between proposed plasticity size effect theories by determining the dimensional dependence of uniaxial plastic deformation of small pillars. We show that yield stress is determined by wall width; the length of the wall making little or no difference. Thus thin structures exhibit the same enhanced yield strength regardless of total size (volume) or surface to volume ratio; nano-layers are as strong as nanoparticles.

Item Type: Article
Keywords: plasticity size effects, micro-compression, proportional limit
Subjects: Advanced Materials
Advanced Materials > Surface Engineering
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4484

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