Tribological and mechanical behavior of nanostructured Al/Ti multilayers

Izadi, Sina; Mraied, Hesham; Cai, Wenjun

doi:10.1016/j.surfcoat.2015.04.039

Cited by 33 publications

(12 citation statements)

References 30 publications

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“…There are, however, very few studies on the wear resistance of metallic multilayers. One such is the recent study of Al/Ti multilayers with either 2.5 or 30 nm individual layer thickness, subjected to 2D microscopic wear testing . It was reported that the wear resistance scales linearly with the applied load, as predicted by Archard’s law, and that the thinner multilayer, which was ≈60% harder than the thicker one, had improved resistance.…”

Section: Introductionmentioning

confidence: 99%

Wear Resistance of Cu/Ag Multilayers: A Microscopic Study

Madhavan

Bellon

Averback

2018

ACS Appl. Mater. Interfaces

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The microscopic wear behavior of copper-silver multilayer samples was studied by performing sliding wear tests using a tribo-indenter. Multilayers with an average composition of CuAg and Ag layer thicknesses ranging from 2 to 20 nm were grown by magnetron sputtering. For reference, a homogeneous CuAg solid solution film was similarly grown. The thin films were subjected to two-dimensional wear tests by rastering a cono-spherical diamond indenter under loads of 100-400 μN for 1-20 consecutive passes or cycles. The wear volumes were determined by atomic force microscopy. Characterization of the specimens employed nanoindentation, nanoscratch, and transmission electron microscopy (TEM). Wear rates were found to reach steady state after five cycles or less. The hardness values of the as-grown and worn samples both increased with decreasing thickness of the Cu and Ag layers, whereas the steady-state wear rates decreased. Notably, the wear resistance increased faster than the corresponding increase in indentation hardness, indicating a deviation from the Archard's law. An inverse relationship between the wear rate and hardness was, however, recovered when using scratch hardness, suggesting that scratch hardness is a better predictor of wear resistance. Characterization of subsurface wear microstructures by TEM revealed that forced chemical mixing and dissolution of layers occur to a depth of ≈40 to 50 nm, stabilizing a chemically homogeneous solid solution below the wear surface. Comparative wear tests on thicker multilayers revealed that Cu/Ag interfaces reduced the wear rate significantly, thus helping to rationalize the high wear resistance of thin multilayers.

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Section: Introductionmentioning

confidence: 99%

Wear Resistance of Cu/Ag Multilayers: A Microscopic Study

Madhavan

Bellon

Averback

2018

ACS Appl. Mater. Interfaces

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“…The ever increasing need to enhance the performance of devices and coatings has prompted research into strategies that can be implemented to decrease the dimensions of thin films and coatings without compromising their mechanical performance. The development of nanostructured metallic multilayers (NMM), for example, represents a successful strategy that has resulted in enhanced performance, such as high strength [1], improved tribological performance [2], giant magneto resistance [3], improved corrosion resistance [4,5], and enhanced thermal stability [6]. Survey of the published literature shows that in most NMM the layers contain different chemistries, with layer thickness values that are smaller than 50 nm, as originally proposed in the pioneering work by Koehler [7].…”

Section: Introductionmentioning

confidence: 99%

Influence of layer thickness on mechanical properties of multilayered NiFe samples processed by electrodeposition

et al. 2016

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Multilayered (ML) NiFe thick foils have been studied in order to provide in synthesizing structure-modulated sheets with superior mechanical properties. The specific electrodeposition parameters were selected to produce ML samples with modulated grain size distribution and layer thicknesses varied from 30 nm up to 5 μm. The influence of layer thickness on mechanical behavior was characterized by coupling nanoindentation tests and SEM/EDS study. Hardness results show that with decreasing layer thickness the strength of ML samples reaches a maximum value and remains relatively constant when layer thickness is less than 100 nm. The measured properties are discussed in the context of layer configuration, overall dimensions, and change in phase and chemical composition.

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“…behavior of NMs have focused primarily on non-optical metal/metal [18][19][20][21][22][23][24][25][26][27][28][29][30] and ceramic/metal multilayer combinations. [31][32][33][34][35][36][37][38][39][40] For non-optical ceramic/metal NMs, several explanations have been proposed for the effect of layer thickness on hardness.…”

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confidence: 99%

“…From these results, it is clear that the repeated bilayer thicknesses without optical optimization yield low experimental average transmittance. The AlN(47)/Ag(21) and AlN(20)/Ag(20) samples have nearly 0% light transmission in the UV/Vis wavelength spectrum due to the presence of thick Ag layers (>10 nm) [51]. AlN(127)/Ag(10) has a 16% transmission due to the thinner Ag layers.…”

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confidence: 99%