Strengthening mechanisms of Ag/Ni immiscible multilayers with fcc/fcc interface

Kobayashi, Yu; Liu, Yue; Rios, Steven; Wang, H.; Zhang, X.

doi:10.1016/j.surfcoat.2013.05.051

Cited by 36 publications

(17 citation statements)

References 34 publications

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“…The wear rates of NbCN-Ag films, all of which were lower than that of NbCN film, were due to the low shear strength of the existing Ag that co-existed in the NbCN matrix [27]. Therefore, it was easier to shear under a loading force and the lower tangential force resulted in a lower plow stress, thus reducing the wear resistance.…”

Section: Tribological Properties At Room Temperaturementioning

confidence: 99%

“…The H/Er and H 3 /Er 2 ratios of NbCN-Ag films, initially increased gradually and reached a maximum value, then decreased with increasing Ag content in the films, the maximum values were 0.097 and 0.31 at 2.0 at.% Ag, respectively. The wear rates of NbCN-Ag films, all of which were lower than that of NbCN film, were due to the low shear strength of the existing Ag that coexisted in the NbCN matrix [27]. Therefore, it was easier to shear under a loading force and the lower tangential force resulted in a lower plow stress, thus reducing the wear resistance.…”

Section: Tribological Properties At Room Temperaturementioning

confidence: 99%

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Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

et al. 2018

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Abstract:In this study, reactive magnetron sputtering was applied for preparing NbCN-Ag films with different Ag additions. Ag contents in the as-deposited NbCN-Ag films were achieved by adjusting Ag target power. The composition, microstructure, mechanical properties, and tribological properties were characterized using energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), high resolution transmission electron microscopy (HRTEM), Raman spectrometry, nano-indentation, and high-temperature sliding wear tests. Results indicated that face-centered cubic (fcc) NbN, hexagonal close-packed (hcp) NbN and fcc Ag, amorphous C and amorphous CN x phase co-existed in the as-deposited NbCN-Ag films. After doping with 2.0 at.% Ag, the hardness and elastic modulus reached a maximum value of 33 GPa and 340 GPa, respectively. Tribological properties were enhanced by adding Ag in NbCN-Ag films at room temperature. When the test temperature rose from 300 to 500 • C, the addition of Ag was found beneficial for the friction properties, showing a lowest friction coefficient of~0.35 for NbCN-12.9 at.% Ag films at 500 • C. This was mainly attributed to the existence of AgO x , NbO x , and AgNbO x lubrication phases that acted as solid lubricants to modify the wear mechanism.

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Section: Tribological Properties At Room Temperaturementioning

confidence: 99%

Section: Tribological Properties At Room Temperaturementioning

confidence: 99%

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

et al. 2018

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“…The strength of NMMs in this case is affected by different factors including the Koehler stress [28][29][30], misfit dislocations [24,28], chemical stress [28,31,32], coherency stress [28,33] and twinning [23,24,34,35,36].…”

mentioning

confidence: 99%

“…There is a larger number of studies focused on the correlation between structure and mechanical properties of cubic systems (bcc/fcc [16,24,37,38], fcc/fcc [23,[39][40][41] and bcc/bcc [23,42]). Only recently, cubic/hcp systems started to attract some attention among the scientific community.…”

mentioning

confidence: 99%

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

Callisti

Polcar

2017

Acta Materialia

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A combination of transmission electron microscopy analyses and nanomechanical measurements was performed in this study to reveal deformation and strengthening mechanisms occurring in sputtered Zr/Nb nanoscale metallic multilayers (NMMs) with a periodicity (L) in the range 6 -167 nm. Electron diffraction analyses revealed a change in the crystallographic orientation of α-Zr when L ≤ 27 nm, while Nb structure retained the same orientations regardless of L. For L > 60 nm, the strengthening mechanism is well described by the Hall-Petch model, while for 27 < L < 60 nm the refined CLS model comes into picture. A decrease in strength is found for L < 27 nm, which could not be simply explained by considering only misfit and Koehler stresses. For L ≤ 27 nm, plastic strain measured across compressed NMMs revealed a change in the plastic behaviour of α-Zr, which experienced a hard-to-soft transition. At these length scales, the combination of two structural factors were found to affect the strength. These relate to the formation of weaker interfaces which extend the effective distance between strong barriers against dislocation transmission, thus producing a softening effect. 1The second effect relates to the crystallographic orientation change exhibited by α-Zr for L < 27 nm with a consequent change of the dominant slip system. The actual strength at these smaller length scales was effectively quantified by taking these structural aspects into account in the interface barrier strength model.

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“…Heterophase interfaces play an important role in determining the physical properties of materials from multiple aspects123456789. For example, it is well-known that electrical resistivity can be tuned by interfaces which usually act as obstacles to charge carriers10.…”

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confidence: 99%

What determines the interfacial configuration of Nb/Al2O3 and Nb/MgO interface

Fang

et al. 2016

Sci Rep

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Nb films are deposited on single crystal Al2O3 (110) and MgO(111) substrates by e-beam evaporation technique. Structure of Nb films and orientation relationships (ORs) of Nb/Al2O3 and Nb/MgO interface are studied and compared by the combination of experiments and simulations. The experiments show that the Nb films obtain strong (110) texture, and the Nb film on Al2O3(110) substrate shows a higher crystalline quality than that on MgO(111) substrate. First principle calculations show that both the lattice mismatch and the strength of interface bonding play major roles in determining the crystalline perfection of Nb films and ORs between Nb films and single crystal ceramic substrates. The fundamental mechanisms for forming the interfacial configuration in terms of the lattice mismatch and the strength of interface bonding are discussed.

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Strengthening mechanisms of Ag/Ni immiscible multilayers with fcc/fcc interface

Cited by 36 publications

References 34 publications

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

What determines the interfacial configuration of Nb/Al2O3 and Nb/MgO interface

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