Grain Boundary Motion under Dynamic Loading: Mechanism and Large-Scale Molecular Dynamics Simulations
Christian Brandl, Timothy C Germann, Alejandro G Perez-Bergquist, Ellen K Cerreta
MATERIALS RESEARCH LETTERS | TAYLOR & FRANCIS INC | Published : 2013
Grain boundaries (GBs) are not static structures during shock loading, despite the short timescales. We present a mechanistic explanation for why non-coherent Σ 3 GBs are particularly mobile, due to their consisting of coherent twin boundaries every third (111) glide plane, separated by incoherent twin boundary segments with three Shockley partial dislocations that can readily glide into either grain. Asymmetric GBs with such structures can thus move in response to the elastic driving force provided by uniaxial compression. We present large-scale molecular dynamic simulations that illustrate this mechanism, which explains the Σ 3 GB faceting recently observed in shock-recovered copper multi-..View full abstract
Awarded by National Nuclear Security Administration of the US Department of Energy (DOE)
Los Alamos National Laboratory is operated by LANS, LLC, for the National Nuclear Security Administration of the US Department of Energy (DOE) under Contract DE-AC52-06NA25396. This work was supported by the DOE Office of Basic Energy Sciences through the Center for Materials at Irradiation and Mechanical Extremes (CMIME), an Energy Frontier Research Center.