Mechanical properties of nanocomposite metal-ceramic thin films

被引：32
作者：
Neralla, S [1 ]
Kumar, D [1 ]
Yarmolenko, S [1 ]
Sankar, J [1 ]
机构：
[1] N Carolina Agr & Tech State Univ, Ctr Adv Mat & Smart Struct, Dept Mech Engn, Greensboro, NC 27411 USA
来源：
COMPOSITES PART B-ENGINEERING | 2004年 / 35卷 / 02期
基金：
美国国家科学基金会;
关键词：
nanoindentation; hardness; fracture toughness; nanocomposites;
D O I：
10.1016/j.compositesb.2003.08.005
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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. (C) 2003 Elsevier Ltd. All rights reserved.
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收藏
页码：157 / 162
页数：6
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