Response of plasma-sprayed alumina–titania composites to static indentation process

Prasad, S. L. Ajit; Mayuram, M.M.; Krishnamurthy, R.

doi:10.1016/s0167-577x(99)00136-6

Cited by 26 publications

(15 citation statements)

References 5 publications

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“…Due to the obvious anisotropic structure and a large number of micro defects, in terms of coating material, the elastic modulus depends on internal microstructure and superficial macrostructure. So, the coatings prepared by different spraying process have different elastic modulus value even for the same material [23]. It can be know from the above analysis that the value of elastic modulus of SPS coating is slightly bigger because the microstructure of SPS coating is denser and better than that of HVOF coating.…”

Section: Ni and Cr Element In This Region Is Almost Equal And The Maimentioning

confidence: 95%

Structure and wear behavior of NiCr–Cr 3 C 2 coatings sprayed by supersonic plasma spraying and high velocity oxy-fuel technologies

Lü

Wang³

et al. 2015

Applied Surface Science

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Section: Ni and Cr Element In This Region Is Almost Equal And The Maimentioning

confidence: 95%

Structure and wear behavior of NiCr–Cr 3 C 2 coatings sprayed by supersonic plasma spraying and high velocity oxy-fuel technologies

Lü

Wang³

et al. 2015

Applied Surface Science

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“…In addition to neutron-based strain measurements, there have been some other limited studies on the use of nondestructive techniques to study the structure-property relationships, e.g., using acoustic emission (AE) to investigate the fracture response during indentation of plasma-sprayed Al 2 O 3 coatings; where pore coalescence, fracture, deformation, debonding, and densification in coatings have been investigated ( Ref 19,20). The influence of thermally sprayed cermet and ceramic coating materials on the indentation behavior has also been a topic of research in recent investigations (Ref [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Residual Strain and Fracture Response of Al2O3 Coatings Deposited via APS and HVOF Techniques

et al. 2011

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The aim of this investigation was to nondestructively evaluate the residual stress profile in two commercially available alumina/substrate coating systems and relate residual stress changes with the fracture response. Neutron diffraction, due to its high penetration depth, was used to measure residual strain in conventional air plasma-sprayed (APS) and finer powder high velocity oxy-fuel (HVOF (h-gun))-sprayed Al 2 O 3 coating/substrate systems. The purpose of this comparison was to ascertain if finer powder Al 2 O 3 coatings deposited via h-gun can provide improved residual stress and fracture response in comparison to conventional APS coatings. To obtain a through thickness residual strain profile with high resolution, a partially submerged beam was used for measurements near the coating surface, and a beam submerged in the coating and substrate materials near the coating-substrate interface. By using the fast vertical scanning method, with careful leveling of the specimen using theodolites, the coating surface and the coating/substrate interface were located with an accuracy of about 50 lm. The results show that the through thickness residual strain in the APS coating was mainly tensile, whereas the HVOF coating had both compressive and tensile residual strains. Further analysis interlinking Vickers indentation fracture behavior using acoustic emission (AE) was conducted. The microstructural differences along with the nature and magnitude of the residual strain fields had a direct effect on the fracture response of the two coatings during the indentation process.

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“…It should be noted that although a general impression is that the trend of the elastic modulus would go along with the magnitude of hardness, 49 but this rule neither has an analytical support nor is generally obeyed by materials. 50 For example, it is generally accepted that cold rolled metallic crystalline alloys with closed packed atoms generally result in an enhanced strength/hardness and an unchanged Young's modulus.…”

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confidence: 99%

Nanoscale Structural Evolution and Anomalous Mechanical Response of Nanoglasses by Cryogenic Thermal Cycling

et al. 2018

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One of the central themes in the amorphous materials research is to understand the nanoscale structural responses to mechanical and thermal agitations, the decoding of which is expected to provide new insights into the complex amorphous structural-property relationship. For common metallic glasses, their inherent atomic structural inhomogeneities can be rejuvenated and amplified by cryogenic thermal cycling, thus can be decoded from their responses to mechanical and thermal agitations. Here, we reported an anomalous mechanical response of a new kind of metallic glass (nanoglass) with nanoscale interface structures to cryogenic thermal cycling. As compared to those metallic glasses by liquid quenching, the ScFe (at. %) nanoglass exhibits a decrease in the Young's modulus but a significant increase in the yield strength after cryogenic cycling treatments. The abnormal mechanical property change can be attributed to the complex atomic rearrangements at the short- and medium- range orders due to the intrinsic nonuniformity of the nanoglass architecture. The present work gives a new route for designing high-performance metallic glassy materials by manipulating their atomic structures and helps for understanding the complex atomic structure-property relationship in amorphous materials.

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Response of plasma-sprayed alumina–titania composites to static indentation process

Cited by 26 publications

References 5 publications

Structure and wear behavior of NiCr–Cr 3 C 2 coatings sprayed by supersonic plasma spraying and high velocity oxy-fuel technologies

Structure and wear behavior of NiCr–Cr 3 C 2 coatings sprayed by supersonic plasma spraying and high velocity oxy-fuel technologies

Residual Strain and Fracture Response of Al2O3 Coatings Deposited via APS and HVOF Techniques

Nanoscale Structural Evolution and Anomalous Mechanical Response of Nanoglasses by Cryogenic Thermal Cycling

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