Atomic structure variations of mechanically stable fcc-bcc interfaces

K. Kang, J. Wang, I. J. Beyerlein

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Abstract

It has recently been shown that under severe plastic deformation processing bi-metal fcc/bcc composites develop a mechanically stable heterophase interface that joins the {112}fcc//{112}bcc planes in the Kurdjumov-Sachs orientation relationship. In this article, we study variations in the relaxed equilibrium atomic structure of this interface with changes in fcc stacking fault energy (SFE) and lattice mismatch between the two crystals. Using molecular statics/dynamics simulations for three fcc/bcc systems, Cu-Nb, Al-Fe, and Al-Nb, we find that the number of distinct sets of intrinsic interfacial dislocations and their core structures vary significantly among these three systems. The impact of these atomic-scale structural differences on interfacial properties is demonstrated through their interactions with point defects. The interfaces studied here are shown to exhibit a wide variation in ability, ranging from being a poor to an excellent sink for vacancies.

Original languageEnglish
Article number053531
JournalJournal of Applied Physics
Volume111
Issue number5
DOIs
Publication statusPublished - 2012 Mar 1

Bibliographical note

Funding Information:
The authors would like to acknowledge support by the Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. 2008LANL1026. J.W. acknowledges support provided by the Los Alamos National Laboratory Directed Research and Development (LDRD) Projects Nos. DR20110029 and ER20110573. K.K. acknowledges partial support from the Leading Foreign Research Institute Recruitment Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2011-0030065).

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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