Flake thickness effect of Al2O3/Al biomimetic nanolaminated composites fabricated by flake powder metallurgy

Al2O3/Al biomimetic nanolaminated composites were fabricated by means of a flake powder metallurgy approach, in which pure Al flake powders with native Al2O3 nano-skins were assembled into a biomimetic nanolaminated structure. The tensile properties of the composites were investigated experimentally...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-01, Vol.594, p.324-329
Main Authors: Zhang, Wenlong, Li, Zhiqiang, Jiang, Lin, Kai, Xizhou, Dai, Xiaoya, Fan, Genlian, Guo, Qiang, Xiong, Dingbang, Su, Yishi, Zhang, Di
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Elasticity. Plasticity
Exact sciences and technology
Finite-element analysis
Flake powder metallurgy
Flake thickness effect
Fractures
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Methods of nanofabrication
Nanolaminated composites
Physics
Powder metallurgy. Composite materials
Production techniques
Strengthening mechanism
Technology
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Summary:Al2O3/Al biomimetic nanolaminated composites were fabricated by means of a flake powder metallurgy approach, in which pure Al flake powders with native Al2O3 nano-skins were assembled into a biomimetic nanolaminated structure. The tensile properties of the composites were investigated experimentally and numerically, and a flake thickness effect was revealed. It was found that the tensile strength increased monotonously with decreasing flake Al powder thickness (FAPT) and reached a maximum of ~435MPa at a FAPT of ~180nm. At a FAPT of ~500nm, a well-balanced strength and ductility was achieved, resulting in a maximum work-of-fracture. Both the decrease in grain size of Al matrix and the increase in volume fraction of Al2O3 contribute to the increase in tensile strength caused by decreasing FAPT. At FAPTs greater than 500nm, the former is dominant; at FAPTs less than 500nm, the latter is dominant. For Al2O3/Al nanolaminated composites, a FAPT of ~500nm is suggested for maximum toughness and smaller for higher tensile strength.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2013.11.086