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Title: Why are some Interfaces in Materials Stronger than others?

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep05461· OSTI ID:1321741

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1321741
Report Number(s):
LA-UR-14-23562
Journal Information:
Scientific Reports, Vol. 4; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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Cited By (11)

Unraveling the Role of Interfaces on the Spall Failure of Cu/Ta Multilayered Systems journal January 2020
Dynamic failure in two-phase materials journal December 2015
Shock induced damage in copper: A before and after, three-dimensional study journal April 2016
Shock wave propagation and spall failure of nanocrystalline Cu/Ta alloys: Effect of Ta in solid-solution journal December 2017
Shock induced damage in copper: A before and after, three-dimensional study text January 2016
Influence of defects on the shock Hugoniot of tantalum journal June 2019
Computational Analysis Methods in Atomistic Modeling of Crystals journal December 2013
Dislocation content in random high angle grain boundaries journal April 2019
Spall response of single-crystal copper journal February 2018
Understanding and predicting damage and failure at grain boundaries in BCC Ta journal October 2019
Effect of peak stress and tensile strain-rate on spall in tantalum journal August 2018