Examination of mechanical properties and failure mechanisms of TiN and Ti−TiN multilayer coatings

Ma, Kai-Tung; Bloyce, A.; Bell, T.

doi:10.1016/0257-8972(95)02585-5

Cited by 103 publications

(19 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well known that the mechanical properties of metal-ceramic nanolaminates depend on the layer thickness (which controls the flow stress of the metal and the failure strength of the ceramic) and on the interface. At room temperature, the stiff, elastic SiC layers constrain the plastic deformation of the soft A1 layers, giving rise to a large strain hardening rate and to very high hardness [22,23]. The mechanisms responsible for the reduction in hardness from 23 °C to 100 °C were not clear, however, and the difficulties in finding an explanation were partly related to the difficulties associated with the interpretation of instrumented nanoindentation tests.…”

Section: Introductionmentioning

confidence: 93%

High temperature micropillar compression of Al/SiC nanolaminates

et al. 2013

View full text Add to dashboard Cite

The effect of the temperature on the compressive stress-strain behavior of Al/SiC nanoscale multilayers was studied by means of micropillar compression tests at 23 °C and 100 °C. The multilayers (composed of alternating layers of 60 nm in thickness of nanocrystalline A1 and amorphous SiC) showed a very large hardening rate at 23 °C, which led to a flow stress of 3.1 ± 0.2 GPa at 8% strain. However, the flow stress (and the hardening rate) was reduced by 50% at 100 °C. Plastic deformation of the A1 layers was the dominant deformation mechanism at both temperatures, but the A1 layers were extruded out of the micropillar at 100 °C, while A1 plastic flow was constrained by the SiC elastic layers at 23 °C. Finite element simulations of the micropillar compression test indicated the role played by different factors (flow stress of Al, interface strength and friction coefficient) on the mechanical behavior and were able to rationalize the differences in the stress-strain curves between 23 °C and 100 °C.

show abstract

Section: Introductionmentioning

confidence: 93%

High temperature micropillar compression of Al/SiC nanolaminates

et al. 2013

View full text Add to dashboard Cite

show abstract

“…TiN/Ti multilayers have a maximum Lc2 for an intermediate thickness of the Ti interlayers because it was suf®ciently high to promote energy absorption and not too high to lead to ductile failure in the titanium layers [17]. The thicker metal layers of the ®rst test were responsible for the spalling of the samples that took place at low loads.…”

Section: Multilayer Coatingsmentioning

confidence: 99%

The influence of ductile interlayers on the mechanical performance of tungsten nitride coatings

Vieira¹,

Ramos²

1999

Journal of Materials Processing Technology

View full text Add to dashboard Cite

Multilayers between ceramic materials and metallic materials can combine the high hardness and wear resistance of the ceramic layers with the toughness and mechanical strength of the metallic layers. This work is aimed at the production and characterisation of tungsten nitride/titanium (or nickel) multilayers. The coatings, deposited by magnetron sputtering, are characterised with respect to their structure, morphology and hardness. The adhesion to the substrate is evaluated by a scratch-test technique, as it constitutes a fundamental prerequisite.The choice of titanium and nickel as interlayering materials was made in order to study the role of materials with elevated plasticity, but with different reactivities. Titanium tends to react chemically with other materials, namely, ferrous oxides and nitrides. Nickel has low chemical reactivity but has the same crystallographic structure as the W 2 N phase. All of the multilayer coatings produced have a total thickness of 4 mm. The hardness of the multilayers, deposited with different ceramic/metal thickness ratios, decreases with the thickness of the ductile metallic layers. When the metal thickness is too high it causes the spalling of the coatings. The optimal medium critical load (65 N) is obtained with a ceramic/metal ratio equal to four. Even though the type of bond is different, the adhesion of the multilayers is not in¯uenced by the substitution of titanium with nickel. The deposition process yields well-adhered and suf®ciently hard multilayer coatings when compared with the ceramic single layers. #

show abstract

“…The plastic deformed region could be seen relatively circular around the indentation area. Ma et al [16] showed the circular crack pattern in the vicinity of the indented area of the annealed TiN single layer with a Vickers indenter. They proved that in softer TiN, cracks which appear around the indentation tend to form circular.…”

Section: Resultsmentioning

confidence: 98%