Misfit dislocation patterns of Mg-Nb interfaces

Y. Chen, S. Shao, X. Y. Liu, S. K. Yadav, N. Li, N. Mara, J. Wang

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23 Scopus citations

Abstract

The role of heterogeneous interfaces in improving mechanical properties of polycrystalline aggregates and laminated composites has been well recognized with interface structure being of fundamental importance in designing composites containing multiple interfaces. In this paper, taking the Mg (hexagonal close-packed (hcp))/Nb (body-centered cubic (bcc)) interface as an example, we develop Mg-Nb interatomic potentials for predicting atomic configurations of Mg/Nb interfaces. We systematically characterize interface dislocations of Mg/Nb interfaces with Nishiyama-Wassermann (NW) and Kurdjumov-Sachs (KS) orientation relationships and propose a generalized procedure of characterizing interface structure by combining atomistic simulation and interface dislocation theory, which is applicable for not only hcp/bcc interfaces, but also other systems with complicated interface dislocation configurations. In Mg/Nb, interface dislocation networks of two types of interfaces are significantly different although they originate from partial dislocations of similar character: the NW interface is composed of three sets of partial dislocations, while the KS interface is composed of four sets of interface dislocations - three sets of partial dislocations and one set of full dislocations that forms from the reaction of two close partial dislocations.

Original languageEnglish (US)
Pages (from-to)552-563
Number of pages12
JournalActa Materialia
Volume126
DOIs
StatePublished - Mar 1 2017

Bibliographical note

Funding Information:
J. Wang acknowledges funding from the Nebraska Center for Energy Sciences and Research. This work was partly supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. S. Shao acknowledges the support of start-up grant provided by the Louisiana State University. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396.

Publisher Copyright:
© 2016 Acta Materialia Inc.

Keywords

  • Atomically informed Frank-Bilby
  • Bimetal interface
  • Hcp/bcc interface
  • Layered nanocomposite

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