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??? |
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頁(從 - 到) | 1934-1942 |
頁數 | 9 |
期刊 | Journal of Materials Research |
卷 | 18 |
發行號 | 8 |
DOIs | |
出版狀態 | 已出版 - 8月 2003 |