Molecular dynamics simulation of effects of twin interfaces on Cu/Ni multilayers

Fu, Tao; Peng, Xianghe; Weng, Shayuan; Zhao, Yinbo; Gao, Fang; Deng, Lijun; Wang, Zhongchang

doi:10.1016/j.msea.2016.01.055

Cited by 63 publications

(21 citation statements)

References 45 publications

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“…Li et al . proposed that dislocation nucleation results in softening of polycrystalline materials 14 , which has also been found in Cu/Ni nanotwinned multilayer films under indentation with a cylindrical indenter 18 . In Fig.…”

Section: Resultsmentioning

confidence: 71%

“…The presence of SDLs indicates either nucleation of new dislocations from TB or reaction between dislocations and TB. The detailed discussion on the reaction process to form step or stair-rod dislocations can be found in our previous work 18 or the theoretical derivation by Zhu, et al . 44 .…”

Section: Resultsmentioning

confidence: 99%

“…These studies help us to gain insights into the effects of interface on the strengthening of multilayer films; nevertheless, the softening mechanism and the effect of modulation period on hardness of Cu/Ni multilayer films can hardly be found in the literature. Recently, some simulations have been performed on the nanoindentation of Cu/Ni multilayer films with cylindrical indenters, revealing that the nanotwinned interface may improve the hardness of the multilayer films 18 , but the effect of twin thickness, especially the softening effect at small twin thickness requires an in-depth investigation. On the other hand, a cylindrical indenter was used to conduct nanoindentation with a two dimensional (2D) specimen in the previous work, in which the in-plane dislocation reaction may be ignored and the evolution of defects mat be constrained.…”

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confidence: 99%

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Molecular dynamics simulation of nanoindentation on Cu/Ni nanotwinned multilayer films using a spherical indenter

Peng

Chen

et al. 2016

Sci Rep

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128

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We performed molecular dynamics simulation of nanoindentation on Cu/Ni nanotwinned multilayer films using a spherical indenter, aimed to investigate the effects of hetero-twin interface and twin thickness on hardness. We found that both twinning partial slip (TPS) and partial slip parallel with twin boundary (PSPTB) can reduce hardness and therefore should not be ignored when evaluating mechanical properties at nanoscale. There is a critical range of twin thickness λ (~25 Å < λ < ~31 Å), in which hardness of the multilayer films is maximized. At a smaller λ, TPSs appear due to the reaction between partial dislocations and twin boundary accounts for the softening-dominated mechanism. We also found that the combination of the lowered strengthening due to confined layer slips and the softening due to TPSs and PSPTBs results in lower hardness at a larger λ.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Molecular dynamics simulation of nanoindentation on Cu/Ni nanotwinned multilayer films using a spherical indenter

Peng

Chen

et al. 2016

Sci Rep

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128

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“…In the existing researches of the nanoindentation for the mechanical properties and plasticity of metallic thin film coatings, attention was mainly paid to face-centered cubic (FCC) metals [ 3 , 4 , 5 , 6 , 7 ]. For example, Fu et al [ 3 , 6 ] analyzed the effects of coherent twin interfaces on the mechanical properties and hardening behavior of Cu/Ni multilayers under nanoindentation. Zhou et al [ 4 ] investigated the effects of hydrogen charging on the mechanical response of FCC Ni and Pd under nanoindentation.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Interaction between Dislocation Loop and Coherent Twin Boundary in BCC Ta Film during Nanoindentation

et al. 2017

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In this work, the interaction between dislocation loop (DL) and coherent twin boundary (CTB) in a body-centered cubic (BCC) tantalum (Ta) film during nanoindentation was investigated with molecular dynamics (MD) simulation. The formation and propagation of <111> full DLs in the nanotwinned (nt) Ta film during the indentation was observed, and it was found that CTB can strongly affect the stress distribution in the Ta film, and thus change the motion and type of dislocations. There are three kinds of mechanisms for the interaction between DL and CTB in a twinned BCC Ta film: (i) dislocation absorption, (ii) dislocation desorption, and (iii) direct slip transmission. The nucleation of twin boundary dislocations and the formation of the steps in CTB were also observed during the indentation. The mechanisms presented in this work can provide atomic images for understanding the plastic deformation of BCC metals with mirror-symmetry grain boundary structures, and provide available information for the evaluation and design of high-performance nt BCC metallic thin film coatings.

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“…Many multilayer systems were studied; among others Co/Cu and Co/Au alloys and multilayer thin films have been intensively studied [8][9][10]. Chado et al [10] studied the deposition of small clusters of Co on gold surfaces with regular defects.…”

Section: Introductionmentioning

confidence: 99%

Stress induced grain boundaries in thin Co layer deposited on Au and Cu

Zientarski

Chocyk

2016

Appl. Phys. A

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In this work, the structure and stress evolution in Co/Au and Co/Cu two-layer systems during deposition were studied. The growth of this system is evaluated by employing molecular dynamic simulations with potentials based on the embedded atom method theory. We used the kinematical scattering theory and the Ackland-Jones bondangle method to the structural characterisation of deposited layers. In both systems, only compressive stress is observed during the deposition process and process relaxation of stress is visible. In Co/Au systems, creation of grains and grain boundaries is observed.

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Molecular dynamics simulation of effects of twin interfaces on Cu/Ni multilayers

Cited by 63 publications

References 45 publications

Molecular dynamics simulation of nanoindentation on Cu/Ni nanotwinned multilayer films using a spherical indenter

Molecular dynamics simulation of nanoindentation on Cu/Ni nanotwinned multilayer films using a spherical indenter

Investigation of Interaction between Dislocation Loop and Coherent Twin Boundary in BCC Ta Film during Nanoindentation

Stress induced grain boundaries in thin Co layer deposited on Au and Cu

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