Synthesis and Characterization of TiO2 Dispersed Al 7075 Micro- and Nanocomposite

R. Karunanithi; K.S. Ghosh; Supriya Bera

doi:10.4028/www.scientific.net/AMR.984-985.313

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 984-985Synthesis and Characterization of TiO2 Dispersed...

Synthesis and Characterization of TiO₂ Dispersed Al 7075 Micro- and Nanocomposite

Abstract:

Micro-TiO₂ and nanoTiO₂ dispersed Al 7075 composites have been synthesized by mechanical milling followed by cold compaction and sintering. The compressibility of the nanocomposites is less than the micro composite, but sintered density of the nanocomposite is higher that the microcomposite. Nanocomposite shows better hardness than microcomposite. However, both types of composites do not show artificial ageing characteristics like unreinforced Al 7075 alloy. Microstructural analysis through XRD and TEM reveals that the formation of MgTiO₃ and ZnO near TiO₂-Al 7075 matrix interface causes depletion of Mg and Zn in the Al 7075 matrix. This suppresses GP zone formation and shows almost no age hardenable characteristic. Potentiodynamic electrochemical polarisation study shows that the corrosion potential (E_corr) has shifted towards noble direction with the addition of TiO₂ in the composite.

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Periodical:

Advanced Materials Research (Volumes 984-985)

Pages:

313-318

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.984-985.313

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Online since:

July 2014

Authors:

R. Karunanithi*, K.S. Ghosh, Supriya Bera

Keywords:

Aging, Al 7075 Composite, Compressibility Behaviour, Electrochemical Behaviour

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