Shock-induced stacking fault pyramids in Ni/Al multilayers

Shock-induced stacking fault pyramids in Ni/Al multilayers Article history: The formations of stacking fault tetrahedra in {111}fcc/{111}fcc multilayers have been studied exten- Received 18 July 2017 sively, but the researches related to {001}fcc/{001}fcc interfaces can rarely be found in the literature. Accepted 28 July 2017 Using molecular dynamics (MD) simulations, the shock-induced dislocation structure in Ni/Al multi- Available online 31 July 2017 layers was studied in this article, the stacking fault pyramids (SFPs) initiated from Ni/Al interface was firstly observed, and the corresponding mechanism was explored. It was shown that the Shockley partial Keyword: dislocations dissociated from the rectangular misfit dislocations along Ni/Al interface are first emitted Ni/Al into the Al interlayer and subsequently intersect with each other to form SFPs. With the propagation of Shock the shock front in the multilayers, two adjacent SFPs interact with each other and form Lomer-Cottrell Stacking fault pyramid locks. The dislocation sheet composed of SFPs and Lomer-Cottrell locks can act as a barrier to dislocation Dislocation transmission. The effect of shock piston velocity on the nucleation site of dislocation was also studied. Molecular dynamics It was shown that dislocations would originate from the interface at a low piston speed (<1.1 km/s), and appear at the shock front if the http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Surface Science Elsevier

Shock-induced stacking fault pyramids in Ni/Al multilayers

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier B.V.
ISSN
0169-4332
eISSN
1873-5584
D.O.I.
10.1016/j.apsusc.2017.07.268
Publisher site
See Article on Publisher Site

Abstract

Article history: The formations of stacking fault tetrahedra in {111}fcc/{111}fcc multilayers have been studied exten- Received 18 July 2017 sively, but the researches related to {001}fcc/{001}fcc interfaces can rarely be found in the literature. Accepted 28 July 2017 Using molecular dynamics (MD) simulations, the shock-induced dislocation structure in Ni/Al multi- Available online 31 July 2017 layers was studied in this article, the stacking fault pyramids (SFPs) initiated from Ni/Al interface was firstly observed, and the corresponding mechanism was explored. It was shown that the Shockley partial Keyword: dislocations dissociated from the rectangular misfit dislocations along Ni/Al interface are first emitted Ni/Al into the Al interlayer and subsequently intersect with each other to form SFPs. With the propagation of Shock the shock front in the multilayers, two adjacent SFPs interact with each other and form Lomer-Cottrell Stacking fault pyramid locks. The dislocation sheet composed of SFPs and Lomer-Cottrell locks can act as a barrier to dislocation Dislocation transmission. The effect of shock piston velocity on the nucleation site of dislocation was also studied. Molecular dynamics It was shown that dislocations would originate from the interface at a low piston speed (<1.1 km/s), and appear at the shock front if the

Journal

Applied Surface ScienceElsevier

Published: Jan 1, 2018

References

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