Misfit dislocation patterns of Mg-Nb interfaces

被引：42

作者：

Chen, Y. ^{[1
]}

Shao, S. ^{[2
]}

Liu, X. -Y. ^{[3
]}

Yadav, S. K. ^{[3
]}

Li, N. ^{[1
]}

Mara, N. ^{[1
,4
]}

Wang, J. ^{[5
]}

机构：

[1] MPA CINT, Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Louisiana State Univ, Dept Mech & Ind Engn, Baton Rouge, LA 70803 USA

[3] Alamos Natl Lab, MST 8, Los Alamos, NM 87545 USA

[4] Alamos Natl Lab, Inst Mat Sci IMS, Los Alamos, NM 87545 USA

[5] Univ Nebraska Lincoln, Mech & Mat Engn, Lincoln, NE 68588 USA

来源：

ACTA MATERIALIA | 2017年 / 126卷

关键词：

Hcp/bcc interface; Bimetal interface; Layered nanocomposite; Atomically informed Frank-Bilby; NANOLAYERED COMPOSITES; DEFORMATION MECHANISMS; MAGNESIUM ALLOY; GRAIN-SIZE; BIMETAL INTERFACES; MOLECULAR-DYNAMICS; BEHAVIOR; METALS; SIMULATIONS; MULTILAYERS;

D O I：

10.1016/j.actamat.2016.12.041

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：552 / 563

页数：12

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