Deformation mechanisms and pseudoelastic behaviors in trilayer composite metal nanowires

Abdolrahim, Niaz; Mastorakos, Ioannis; Zbib, Hussein M.

doi:10.1103/physrevb.81.054117

Cited by 32 publications

(13 citation statements)

References 28 publications

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“…The confined layer slip (CLS) model suggests that in some cases having layer thicknesses on the order of 20 nm will lead to dislocation motion being constrained to individual layers, due to the dissimilar elastic properties of the layers, rather than allowing dislocations to propagate across interfaces [21]. Furthermore, in certain structures such as Cu-Ni, a nanowire consisting of a copper core with a Ni shell can exhibit pseudoelasticity at large strains due to twinning [22][23][24]. Therefore, it may be possible to increase strength or relative ductility in nanoporous materials by synthesizing ligaments that consist of a coreshell structure of a nanolayered metal; a composite foam, if it behaves like a metallic multilayer, should exhibit more strain hardening capacity than the single material system [20].…”

Section: Introductionmentioning

confidence: 99%

The mechanical response of core-shell structures for nanoporous metallic materials

Abdolrahim

Bahr

Revard

et al. 2013

Philosophical Magazine

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Nanoporous gold (NP-Au) exhibits microscale plasticity, but macroscopically fails in a relatively brittle manner. This current study suggests that a core-shell structure can increase both ductility and strength of NP-Au. A core Au foam structure was created using conventional dealloying methods with average ligament size of 60 nm. Nickel was then electroplated on to the NPAu with layer thicknesses ranging from 2.5 nm to 25 nm. Nanoindentation demonstrated a significant increase in the hardness of the coated Np-Au, to about five times of that of the pure Np-Au, and a decrease in creep by increasing the thickness of the coated Ni layer. Molecular dynamics simulations of Au-Ni ligaments show the same trend of strengthening behavior with increasing Ni thickness suggesting that the strengthening mechanisms of the Np-Au are comparable to those for fcc nano ligaments. The simulations demonstrate two different strengthening mechanisms with the increased activity of the twins in plated Au-Ni ligaments, which leads to more ductile behavior, as opposing to the monolithic Au ligaments where nucleation of dislocations govern the plasticity during loading.

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Section: Introductionmentioning

confidence: 99%

The mechanical response of core-shell structures for nanoporous metallic materials

Abdolrahim

Bahr

Revard

et al. 2013

Philosophical Magazine

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“…Abdolrahim and Mastorakos [87,174] have studied the interface enhancement effect in Cu-Ni-Cu sandwiched composite nanowires. The interface is parallel to the wire axis direction and resembles that in the core-shell configuration but with less structural symmetry.…”

Section: Interface-enhanced Pseudo-elasticity In Layered Composite Namentioning

confidence: 98%

“…Hence, surface effects are dominant factors affecting the structure of nanowires and can even induce thorough structural transition. On the heels of these discoveries, other interesting materials properties such as surfaceinduced lattice reorientation, martensitic phase transformation (MT), pseudo-elastic behavior, and shape memory effects (SMEs) have been studied and observed from fcc [14,[19][20][21][22][23]28,[63][64][65][66][67][68][69][70][71][72][73][74][75], bcc [76][77][78][79][80][81][82], and hcp [83,84] single-element, layered composite [85][86][87][88][89], intermetallic alloy [90][91][92][93][94][95], and even metal oxide [96][97][98][99][100] or nitride [101] compound nanowires. The reversible strain can be as high as 40-70% and is much lar...…”

Section: Size-dependent Structural Stability Of Nanomaterialsmentioning

confidence: 99%

Surface-induced structural transformation in nanowires

Chu

2013

Materials Science and Engineering: R: Reports

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“…In two previous papers 1, 2 we studied the possibility of increasing the critical dimensions of nanowires for exhibiting pseudoelasticity by adding the coherency stresses found in coppernickel (Cu-Ni) interfaces, using molecular dynamics (MD) simulations. In particular, our simulations showed that trilayer composite nanowires, made of alternating copper and nickel layers, would still exhibit pseudoelastic behavior for total thicknesses that are about 3 times larger than that of single crystalline nanowires 2 .…”

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confidence: 99%

Observation of pseudoelastic behavior in large Cu-Ni composite multilayer nanowires

et al. 2014

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In recent years, studies have shown that single crystal metallic nanowires (NWs) can exhibit unique pseudoelastic behavior when their cross-sectional area is smaller than a certain critical value, which is on the order of a few nms. The mechanism responsible for this behavior is the formation of partial dislocations (twinning). In this paper we demonstrate using molecular dynamics simulations that thicker composite nanowires can exhibit pseudoelastic behavior at large cross-sectional dimensions to 28 nm and higher, as long as the individual layer thickness do not exceed a critical value of 1.8-2 nm, thus making their manufacturing feasible and more attractive.In two previous papers 1,2 we studied the possibility of increasing the critical dimensions of nanowires for exhibiting pseudoelasticity by adding the coherency stresses found in coppernickel (Cu-Ni) interfaces, using molecular dynamics (MD) simulations. In particular, our simulations showed that trilayer composite nanowires, made of alternating copper and nickel layers, would still exhibit pseudoelastic behavior for total thicknesses that are about 3 times larger than that of single crystalline nanowires 2 . In this paper we expand this work to composite nanowires with several numbers of layers with total dimensions much larger (15 times and more) than single crystalline nanowires. Our results show that even these "thick" structures exhibit pseudoelasticity. The key parameter to this behavior is the restriction of the individual layer thickness below a critical value that is related to the maximum thickness of a single metal nanowire to exhibit pseudoelasticity. The resulted structures could maintain their pseudoelastic behavior with very few residual dislocations under several loading/unloading processes. It is our belief that these composite wires can be manufactured from nano-metallic multilayers 3 using already established techniques.Metallic nanowires have many potential applications in nanoscale electromechanical systems 2,3 (NEMS) 4,5 due to their unique physical, electronic, magnetic and optical properties that are coupled with their mechanical behavior 6-9 . Hence, it is important to understand the mechanical properties of nanowires to recognize their future applications in nanotechnology 10 . Among metallic nanowires, fcc nanowires exhibit very unique behavior of pseudoelasticity 11-13 upon applying and removal of tensile loading. They can recover plastic strains of up to 40% which is far beyond the limits for conventional shape memory bulk materials that is about 5-8% 14 . This behavior of pseudoelasticity is very important in the area of self-healing materials used as 4 6 9

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Deformation mechanisms and pseudoelastic behaviors in trilayer composite metal nanowires

Cited by 32 publications

References 28 publications

The mechanical response of core-shell structures for nanoporous metallic materials

The mechanical response of core-shell structures for nanoporous metallic materials

Surface-induced structural transformation in nanowires

Observation of pseudoelastic behavior in large Cu-Ni composite multilayer nanowires

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