Investigation on Formation Mechanism of Cu/Cr-Al2O3 Nanocomposite

Saeed Sheibani; Abolghasem Ataie; Saeed Heshmati-Manesh; Alfonso Caballero Martínez

doi:10.4028/www.scientific.net/AMR.364.7

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 364Investigation on Formation Mechanism of...

Investigation on Formation Mechanism of Cu/Cr-Al₂O₃ Nanocomposite

Abstract:

In this research, formation mechanism of a Cu/10 wt.% Cr-10 wt.% Al₂O₃ nanocomposite via mechanical alloying and subsequent heat treatment has been investigated. It was found that during milling process, Cu (Al) solid solution and Cu₉Al₄ phase were formed as intermediate products. Further heat treatment carried out under argon atmosphere at 900°C for 8 hours resulted in completion of Cr₂O₃ reduction by Al. The mechanism of in-situ formation of Al₂O₃ reinforcement in the copper matrix was also discussed as a two stages process. The SEM and TEM results confirmed the proposed mechanism and showed that the Cr dispersoids surrounded by Al₂O₃, in the nanometric scale. Also, the Cu matrix with mean crystallite size of 30 nm was stable at high temperature.

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Periodical:

Advanced Materials Research (Volume 364)

Pages:

7-11

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.364.7

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Online since:

October 2011

Authors:

Saeed Sheibani, Abolghasem Ataie, Saeed Heshmati-Manesh, Alfonso Caballero Martínez

Keywords:

Copper, Mechanical Alloying (MA), Nanocomposite

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