Misfit dislocation patterns of Mg-Nb interfaces

Chen, Youxing; Shao, Shuai; Liu, Xiang-Yang; Yadav, Satyesh Kumar; Li, Nan; Mara, Nathan Allan; Wang, Jian

doi:10.1016/j.actamat.2016.12.041

Misfit dislocation patterns of Mg-Nb interfaces

Journal Article · Thu Jan 19 23:00:00 EST 2017 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2016.12.041· OSTI ID:1454992

^[1]; Shao, Shuai ^[2]; ^[1]; Yadav, Satyesh Kumar ^[1]; ^[1]; ^[1]; Wang, Jian ^[3]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Mechanical and Industrial Engineering
Univ. of Nebraska, Lincoln, NE (United States). Mechanical and Materials Engineering

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.Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1454992

Alternate ID(s):: OSTI ID: 22647017
OSTI ID: 1397830

Report Number(s):: LA-UR--16-28611

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 126; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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