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Title: The emergence of small-scale self-affine surface roughness from deformation

Abstract

Most natural and man-made surfaces appear to be rough on many length scales. There is presently no unifying theory of the origin of roughness or the self-affine nature of surface topography. One likely contributor to the formation of roughness is deformation, which underlies many processes that shape surfaces such as machining, fracture, and wear. Using molecular dynamics, we simulate the biaxial compression of single-crystal Au, the high-entropy alloy Ni36.67Co30Fe16.67Ti16.67, and amorphous Cu50Zr50and show that even surfaces of homogeneous materials develop a self-affine structure. By characterizing subsurface deformation, we connect the self-affinity of the surface to the spatial correlation of deformation events occurring within the bulk and present scaling relations for the evolution of roughness with strain. These results open routes toward interpreting and engineering roughness profiles.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Karlsruhe Inst. of Technology (KIT) (Germany)
  2. Univ. of Freiburg (Germany)
  3. Ecole Polytechnique Federale Lausanne (Switzlerland)
  4. Univ. of Freiburg (Germany); Karlsruhe Inst. of Technology (KIT) (Germany)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1619212
Report Number(s):
SAND-2020-0815J
Journal ID: ISSN 2375-2548; 683107
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 7; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Hinkle, Adam R., Nöhring, Wolfram G., Leute, Richard, Junge, Till, and Pastewka, Lars. The emergence of small-scale self-affine surface roughness from deformation. United States: N. p., 2020. Web. doi:10.1126/sciadv.aax0847.
Hinkle, Adam R., Nöhring, Wolfram G., Leute, Richard, Junge, Till, & Pastewka, Lars. The emergence of small-scale self-affine surface roughness from deformation. United States. doi:https://doi.org/10.1126/sciadv.aax0847
Hinkle, Adam R., Nöhring, Wolfram G., Leute, Richard, Junge, Till, and Pastewka, Lars. Fri . "The emergence of small-scale self-affine surface roughness from deformation". United States. doi:https://doi.org/10.1126/sciadv.aax0847. https://www.osti.gov/servlets/purl/1619212.
@article{osti_1619212,
title = {The emergence of small-scale self-affine surface roughness from deformation},
author = {Hinkle, Adam R. and Nöhring, Wolfram G. and Leute, Richard and Junge, Till and Pastewka, Lars},
abstractNote = {Most natural and man-made surfaces appear to be rough on many length scales. There is presently no unifying theory of the origin of roughness or the self-affine nature of surface topography. One likely contributor to the formation of roughness is deformation, which underlies many processes that shape surfaces such as machining, fracture, and wear. Using molecular dynamics, we simulate the biaxial compression of single-crystal Au, the high-entropy alloy Ni36.67Co30Fe16.67Ti16.67, and amorphous Cu50Zr50and show that even surfaces of homogeneous materials develop a self-affine structure. By characterizing subsurface deformation, we connect the self-affinity of the surface to the spatial correlation of deformation events occurring within the bulk and present scaling relations for the evolution of roughness with strain. These results open routes toward interpreting and engineering roughness profiles.},
doi = {10.1126/sciadv.aax0847},
journal = {Science Advances},
number = 7,
volume = 6,
place = {United States},
year = {2020},
month = {2}
}

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