Formation of Mg-Mg2Cu nanostructured eutectic in Mg-based metal matrix composite

N. G. Ma, C. J. Deng, P. Yu, W. Y. Kwok, M. Aravind, D. H.L. Ng, S. L.I. Chan

研究成果: 雜誌貢獻期刊論文同行評審

18 引文 斯高帕斯(Scopus)

摘要

We report the fabrication and characterization of a Mg-based metal matrix composite reinforced by MgO ceramic and Mg-Mg2Cu eutectic. The composite was fabricated by sintering and quenching of a Mg-20 wt.% CuO sample. We performed differential scanning calorimetry (DSC) on the sample and found that the reaction between Mg and CuO took place at about 420°C. When the sample was sintered to 550°C and cooled down, the two-phase Mg-Mg2 Cu eutectic formed. The final composite product contained MgO particles and Mg-Mg2Cu eutectic, which were embedded in the Mg matrix. Based on the results from DSC and scanning and transmission electron microscopies, a model is proposed to describe the competitive growth of Mg and the eutectic during solidification. We also found that the microstructure of the Mg-Mg2Cu eutectic strongly depended on the rate of cooling. The lamellar thickness of the eutectic could be reduced to 120 nm by oil-quenching the sintered sample.

原文???core.languages.en_GB???
頁(從 - 到)1934-1942
頁數9
期刊Journal of Materials Research
18
發行號8
DOIs
出版狀態已出版 - 8月 2003

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