Influence of nanoscale interfaces on the dynamic deformation and spall failure of Cu–Fe alloy microstructures
Abstract
Additively manufactured immiscible Cu–Fe alloys can exhibit a distribution of nanoscale interfaces due to the distribution of nanoscale clusters in the equilibrium and metastable phases. Molecular dynamics simulations investigate the role of such interfaces on the phase stability and transformation behavior during shock compression, as well as the mechanisms of damage nucleation during spall failure. The model multiphase Cu–Fe systems studied here comprise a distribution of Fe clusters in an FCC Cu matrix, as well as Cu clusters in a BCC Fe matrix. The length scales of the nanoscale clusters determine the energetics of the interfaces that can result in FCC/BCC (equilibrium) or FCC/FCC (metastable) interfaces in the Cu system matrix, and BCC/FCC (equilibrium) or BCC/BCC (metastable) interfaces in the Fe matrix. The MD simulations demonstrate that nanoscale metastable interface microstructures can induce plastic deformation and also stabilize phases or suppress phase transformations in metastable phase clusters. In contrast, equilibrium interfaces can influence phase transformation thresholds and serve as additional void nucleation sites during failure.
Article Details
Journal Info
Journal of Applied Physics
American Institute of Physics
Authors (4)
Phillip Tsurkan
Materials Science and Engineering, and Institute of Materials Science, University of Connecticut 1 , Storrs, Connecticut 06269,
Marco J. Echeverria
Materials Physics Applications Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545,
Avanish Mishra
Center for Engineering in Medicine and Surgery, Massachusetts General Hospital and Harvard Medical School
Avinash M. Dongare
Materials Science and Engineering, and Institute of Materials Science, University of Connecticut 1 , Storrs, Connecticut 06269,