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

Abstract

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.

Authors:
 [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1256810
Alternate Identifier(s):
OSTI ID: 1430399
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Progress in Materials Science
Additional Journal Information:
Journal Volume: 82; Journal Issue: C; Journal ID: ISSN 0079-6425
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; strength statistics; intrinsic thermal-activation mechanism; extrinsic stochastic mechanism; universal relationship between strength and sample size

Citation Formats

Gao, Yanfei, and Bei, Hongbin. Strength statistics of single crystals and metallic glasses under small stressed volumes. United States: N. p., 2016. Web. doi:10.1016/j.pmatsci.2016.05.002.
Gao, Yanfei, & Bei, Hongbin. Strength statistics of single crystals and metallic glasses under small stressed volumes. United States. doi:10.1016/j.pmatsci.2016.05.002.
Gao, Yanfei, and Bei, Hongbin. Fri . "Strength statistics of single crystals and metallic glasses under small stressed volumes". United States. doi:10.1016/j.pmatsci.2016.05.002. https://www.osti.gov/servlets/purl/1256810.
@article{osti_1256810,
title = {Strength statistics of single crystals and metallic glasses under small stressed volumes},
author = {Gao, Yanfei and Bei, Hongbin},
abstractNote = {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.},
doi = {10.1016/j.pmatsci.2016.05.002},
journal = {Progress in Materials Science},
number = C,
volume = 82,
place = {United States},
year = {2016},
month = {5}
}

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Works referencing / citing this record:

“Softness” as the structural origin of plasticity in disordered solids: a quantitative insight from machine learning
journal, July 2018


“Softness” as the structural origin of plasticity in disordered solids: a quantitative insight from machine learning
journal, July 2018