Compressive flow behavior of Al–TiN multilayers at nanometer scale layer thickness

Bhattacharyya, Dhriti; Mara, Nathan A.; Dickerson, P.; Hoagland, R. G.; Misra, Amit

doi:10.1016/j.actamat.2011.02.036

Cited by 135 publications

(56 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Al is confined by the TiN that is still undergoing only elastic deformation. This confinement generates the high work-hardening rates in the Al and CLS is the dominant mechanism for Al thicknesses in the range from 30 nm down to approximately 5 nm at which point the stresses necessary for dislocation motion within the aluminium becomes so high that it is energetically favourable for the dislocations to transmit across the Al-TiN interface, enabling co-deformation of the metal and ceramic layers [32].…”

Section: Resultsmentioning

confidence: 99%

Indentation Fracture Response of Al–TiN Nanolaminates

Mook

Raghavan

Baldwin

et al. 2013

Materials Research Letters

View full text Add to dashboard Cite

Supplementary Material Available OnlineIndentation fracture experiments on aluminium-titanium nitride nanolaminates were conducted both inside and outside of a scanning electron microscope (SEM). Remarkably, indentation fracture toughness increases with increasing strength for bilayer thicknesses less than 10 nm. In addition, slower strain rates favour formation of lateral cracking while increasing rates favour formation of radial cracks. SEM movies show that an increase in radial crack length does not occur during the unloading cycle; this is due to flow of aluminium into the cracks during unloading and is a form of self-healing which should be applicable to metal-ceramic nanolaminates in general.

show abstract

Section: Resultsmentioning

confidence: 99%

Indentation Fracture Response of Al–TiN Nanolaminates

Mook

Raghavan

Baldwin

et al. 2013

Materials Research Letters

View full text Add to dashboard Cite

show abstract

“…2b). 36 The deformed pillar shows no sign of localized shear, and appears to have undergone homogeneous deformation, with no detectable roughening of the pillar surface that could correspond to plastic flow in the Al phase alone. The corresponding stress-strain curves for the 2 nm Al/2 nm TiN sample, as well as the 18 nm Al/2 nm TiN material are shown in Fig.…”

Section: Ex Situ Observation Of Tin Plasticity In Al-tin Nanolayered mentioning

confidence: 97%

“…The measurements presented here showed that the strain hardening values exhibit a strong size effect tied to the layer thickness as well as to the layer thickness ratio. 36 The interfaces between Al and TiN are expected to be strong barriers for dislocation motion, and mobility of dislocations in TiN is expected to be relatively low, so the high strength is easily explained. However, the strain hardening rates due to plastic deformation in Al for the 2 nm Al/2 nm TiN case range from 16 to 35 GPa in Fig.…”

Section: Ex Situ Observation Of Tin Plasticity In Al-tin Nanolayered mentioning

confidence: 99%

“…Thus, plastic co-deformation in Al-TiN multilayers is enhanced as the bilayer period decreases, and at a given bilayer period, as the layer thickness ratio decreases. 36 (c) The compressive stress-strain curves of Al layers for 2 nm Al/2 nm TiN and 18 nm Al/2 nm TiN multilayers, and (d) corresponding derivatives to obtain strain hardening rate for Al layers as a function of effective strain in Al for the two multilayers. This calculation is carried out with the TiN layer assumed to be purely elastic.…”

Section: Mechanisms For Enhanced Work Hardening and Plasticity In Al-mentioning

confidence: 99%

See 1 more Smart Citation

Interface-Driven Plasticity in Metal–Ceramic Nanolayered Composites: Direct Validation of Multiscale Deformation Modeling via In Situ Indentation in TEM

Mara

Misra

et al. 2015

JOM

View full text Add to dashboard Cite

We present in situ indentation in a transmission electron microscope on Al-TiN multilayers with individual layer thicknesses of 50 nm and 2.7 nm to explore the effect of length scales on the plastic co-deformability of a metal and a ceramic. At 50 nm, plasticity was confined to the Al layers with brittle fracture in the TiN layers. At 5 nm and below, cracking in TiN was suppressed with co-deformation evident in both layers. The in situ transmission electron microscopy (TEM) straining results demonstrate a profound size effect in enhancing plastic co-deformability in nanoscale metal-ceramic multilayers, as well as direct validation of ex situ and 3-D elastic-plastic deformation models.

show abstract

“…However, these methods were developed with homogeneous materials in mind, including the assumption that elastic recovery occurs during the indentation unloading phase (Tang et al, 2010). Multilayered configurations introduce complex internal stress and strain behaviors, which may affect the derived mechanical property values in ways not yet understood (Bhattacharyya et al, 2011;Jamison and Shen, 2016). Prior work in this area has investigated elastic modulus, hardness, plastic deformation during unloading, imperfect layer geometry, and delamination Tang et al, 2008Tang et al, , 2010Wang et al, 2012;Jamison and Shen, 2016).…”

Section: Introductionmentioning

confidence: 99%

Indentation-Induced Shear Band Formation in Thin-Film Multilayers

Bigelow

Shen

2017

Front. Mater.

View full text Add to dashboard Cite

We report an exploratory investigation into the cause of shear band formation in multilayer thin films subject to nanoindentation. The material system considered here is composed of alternating aluminum (Al) and silicon carbide (SiC) nanolayers, atop a silicon (Si) substrate. Finite element models are developed in an attempt to reproduce the shear banding phenomenon observed experimentally. By introducing strain softening into the material model for the hard SiC layers, shear bands can be seen to emerge from the indentation site in the finite element analysis. Broad implications, along with possible directions for future work, are discussed.

show abstract

Compressive flow behavior of Al–TiN multilayers at nanometer scale layer thickness

Cited by 135 publications

References 39 publications

Indentation Fracture Response of Al–TiN Nanolaminates

Indentation Fracture Response of Al–TiN Nanolaminates

Interface-Driven Plasticity in Metal–Ceramic Nanolayered Composites: Direct Validation of Multiscale Deformation Modeling via In Situ Indentation in TEM

Indentation-Induced Shear Band Formation in Thin-Film Multilayers

Contact Info

Product

Resources

About