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Aging behavior of nano-SiC_p reinforced AZ61 magnesium matrix composites

China Foundry 2011年第3期8卷 269-273页

作者： Yan Hong Hu Xiaowu Nie Qiao Chen Lei School of Mechanical-Electrical Engineering Nanchang University Nanchang 330031 China

The mechanical properties of magnesium matrix composties can be further improved by aging treatment. To study the aging behavior of SiC particles reinforced AZ61 magnesium matrix composites fabricated by ultrasonic method, an investigation has been undertaken by means of Vickers hardness measurement, scanning electron microscopy （SEM） and energy spectrum analyzing apparatus. The box-type heat treatment furnace was used in the study. The results showed that no discontinuous cellular precipitation is observed at the grain boundaries in the magnesium matrix of the composite while the MglTAI12 preferentially precipitates in the matrix. The time to reach the peak hardness for AZ61 alloy or sicp/AZ61 magnesium matrix composites is reduced with the increase of aging temperature. At the same temperature, the composite exhibit an accelerated aging manner but lower aging efficiency, compared with the unreinforced matrix alloy. The microhardness of the composite is higher than that of the unreinforced matrix alloy, because that the SiC particles distributes homogeneously in the matrix alloy under the ultrasonic processing condition.

关键词： aging behavior nano-sicp magnesium matrix composites precipitates

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Effects of nano-SiC_p content on microstructure and mechanical properties of SiC_p/A356 composites assisted with ultrasonic treatment

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Transactions of Nonferrous Metals Society of China 2018年第11期28卷 2174-2181页

作者： Kun HU Du YUAN Shu-lin Lü Shu-sen WU State Key Laboratory of Materials Processing and Die ＆ Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

nano-sicp/A356 composites with different nano-sicp contents were prepared by squeeze casting after ultrasonic treatment（UT）. The effects of sicp content on the microstructure and mechanical properties of the nanocomposites were investigated. Theresults show that with the addition of nano-sicp, the microstructure of nanocomposites is obviously refined, the morphology of theα（Al） grains transforms from coarse dendrites to rosette crystals, and long acicular eutectic Si phases are shortened and rounded. Themechanical properties of 0.5%, 1% and 2% （mass fraction） sicp/A356 nanocomposites are improved continuously with the increaseof nano-sicp content. Especially, when the sicp content is 2%, the tensile strength, yield strength and elongation are 259 MPa,144 MPa and 5.3%, which are increased by 19%, 69% and 15%, respectively, compared with those of the matrix alloy. Theimprovement of strength is attributed to mechanisms of Hall？Petch strengthening and Orowan strengthening.

关键词： nano-sicp aluminum matrix composites ultrasonic treatment microstructure mechanical properties

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