Mechanical properties of nanocomposite metal - Ceramic thin films

Sudhir Neralla; Dhananjay Kumar; Sergei Yarmolenko; Jagannathan Sankar

doi:10.1016/j.compositesb.2003.08.005

Mechanical properties of nanocomposite metal - Ceramic thin films

Sudhir Neralla
, Dhananjay Kumar
, Sergei Yarmolenko
, Jagannathan Sankar

Mechanical Engineering

Industrial and systems engineering with North Carolina A&T State University

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

Thin film composites consisting of metallic nanocrystals embedded in an insulating host have been synthesized using alternating-target pulsed laser deposition of Ni and Al2O3 on silicon (100) substrate. The evaluation of structural quality of the thin film composites using high resolution transmission electron microscopy and scanning transmission electron microscopy with atomic number contrast has revealed the formation of a biphase system with thermodynamically driven segregation of Ni and alumina during pulsed laser deposition. The best hardness values of the thin film composites, measured using nanoindentation techniques, were found to be 20-30% larger than pure alumina films fabricated under identical conditions. Fracture toughness measurements of the composite showed slight toughening due to embedding of Ni nanoparticles. © 2003 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	157-162
Number of pages	6
Journal	Composites Part B: Engineering
Volume	35
Issue number	2
DOIs	https://doi.org/10.1016/j.compositesb.2003.08.005
State	Published - Mar 1 2004

Keywords

B. Fracture toughness
B. Hardness
Nanocomposites
Nanoindentation

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10.1016/j.compositesb.2003.08.005

Cite this

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title = "Mechanical properties of nanocomposite metal - Ceramic thin films",

abstract = "Thin film composites consisting of metallic nanocrystals embedded in an insulating host have been synthesized using alternating-target pulsed laser deposition of Ni and Al2O3 on silicon (100) substrate. The evaluation of structural quality of the thin film composites using high resolution transmission electron microscopy and scanning transmission electron microscopy with atomic number contrast has revealed the formation of a biphase system with thermodynamically driven segregation of Ni and alumina during pulsed laser deposition. The best hardness values of the thin film composites, measured using nanoindentation techniques, were found to be 20-30\% larger than pure alumina films fabricated under identical conditions. Fracture toughness measurements of the composite showed slight toughening due to embedding of Ni nanoparticles. {\textcopyright} 2003 Elsevier Ltd. All rights reserved.",

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AU - Neralla, Sudhir

AU - Kumar, Dhananjay

AU - Yarmolenko, Sergei

AU - Sankar, Jagannathan

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Y1 - 2004/3/1

N2 - Thin film composites consisting of metallic nanocrystals embedded in an insulating host have been synthesized using alternating-target pulsed laser deposition of Ni and Al2O3 on silicon (100) substrate. The evaluation of structural quality of the thin film composites using high resolution transmission electron microscopy and scanning transmission electron microscopy with atomic number contrast has revealed the formation of a biphase system with thermodynamically driven segregation of Ni and alumina during pulsed laser deposition. The best hardness values of the thin film composites, measured using nanoindentation techniques, were found to be 20-30% larger than pure alumina films fabricated under identical conditions. Fracture toughness measurements of the composite showed slight toughening due to embedding of Ni nanoparticles. © 2003 Elsevier Ltd. All rights reserved.

AB - Thin film composites consisting of metallic nanocrystals embedded in an insulating host have been synthesized using alternating-target pulsed laser deposition of Ni and Al2O3 on silicon (100) substrate. The evaluation of structural quality of the thin film composites using high resolution transmission electron microscopy and scanning transmission electron microscopy with atomic number contrast has revealed the formation of a biphase system with thermodynamically driven segregation of Ni and alumina during pulsed laser deposition. The best hardness values of the thin film composites, measured using nanoindentation techniques, were found to be 20-30% larger than pure alumina films fabricated under identical conditions. Fracture toughness measurements of the composite showed slight toughening due to embedding of Ni nanoparticles. © 2003 Elsevier Ltd. All rights reserved.

KW - B. Fracture toughness

KW - B. Hardness

KW - Nanocomposites

KW - Nanoindentation

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JO - Composites Part B: Engineering

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Mechanical properties of nanocomposite metal - Ceramic thin films

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Keywords

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