Why are some Interfaces in Materials Stronger than others?

Grain boundaries (GBs) are often the preferred sites for void nucleation in ductile metals. However, it has been observed that all boundaries do not contribute equally to this process. We present a mechanistic rationale for the role of GBs in damage nucleation in copper, along with a quantitative ma...

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Bibliographic Details
Published inScientific reports Vol. 4; no. 1; p. 5461
Main Authors Fensin, S. J., Cerreta, E. K., III, G. T. Gray, Valone, S. M.
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 26.06.2014
Nature Publishing Group
Subjects
119/118
639/301
639/301/1023
Alloys
Boundaries
Compression
Copper
Grain boundary, void nucleation, shock loading
Heavy metals
Humanities and Social Sciences
Interfaces
MATERIALS SCIENCE
multidisciplinary
Nucleation
Science
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Summary:Grain boundaries (GBs) are often the preferred sites for void nucleation in ductile metals. However, it has been observed that all boundaries do not contribute equally to this process. We present a mechanistic rationale for the role of GBs in damage nucleation in copper, along with a quantitative map for predicting preferred void nucleation at GBs based on molecular dynamics simulations in copper. Simulations show a direct correlation between the void nucleation stress and the ability of a grain boundary to plastically deform by emitting dislocations, during shock compression. Plastic response of a GB, affects the development of stress concentrations believed to be responsible for void nucleation by acting as a dissipation mechanism for the applied stress.
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USDOE
LA-UR-14-23562
AC52-06NA25396
ISSN:2045-2322
2045-2322
DOI:10.1038/srep05461