Strength statistics of single crystals and metallic glasses under small stressed volumes

Gao, Yanfei; Bei, Hongbin

doi:10.1016/j.pmatsci.2016.05.002

Title: Strength statistics of single crystals and metallic glasses under small stressed volumes

Journal Article · Fri May 13 04:00:00 UTC 2016 · Progress in Materials Science

DOI: https://doi.org/10.1016/j.pmatsci.2016.05.002 · OSTI ID:1256810

Gao, Yanfei ^[1]; Bei, Hongbin ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

It has been well documented that plastic deformation of crystalline and amorphous metals/alloys shows a general trend of “smaller is stronger”. The majority of the experimental and modeling studies along this line have been focused on finding and reasoning the scaling slope or exponent in the logarithmic plot of strength versus size. In contrast to this view, here we show that the universal picture should be the thermally activated nucleation mechanisms in small stressed volume, the stochastic behavior as to find the weakest links in intermediate sizes of the stressed volume, and the convolution of these two mechanisms with respect to variables such as indenter radius in nanoindentation pop-in, crystallographic orientation, pre-strain level, sample length as in uniaxial tests, and others. Furthermore, experiments that cover the entire spectrum of length scales and a unified model that treats both thermal activation and spatial stochasticity have discovered new perspectives in understanding and correlating the strength statistics in a vast of observations in nanoindentation, micro-pillar compression, and fiber/whisker tension tests of single crystals and metallic glasses.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1256810

Journal Information:: Progress in Materials Science, Journal Name: Progress in Materials Science Journal Issue: C Vol. 82; ISSN 0079-6425

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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