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Precipitation Kinetics and Evaluation of the Interfacial Mobility of Precipitates in an AlSi_7Cu_(0.5)Mg_(0.3) Cast Alloy

机译:AlSi_7Cu_(0.5)Mg_(0.3)铸造合金中的析出动力学和析出物的界面迁移率评估

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Heat treatment of cast aluminum alloy parts enables the formation and distribution of nano-sized precipitates through an optimum sequence including solution-izing, quenching, and artificial aging. Quaternary alloys are particularly challenging, and the present study aims to understand and outline the precipitation kinetics in the foundry AlSi_7Cu_(0.5)Mg_(0.3) alloy. Using techniques like differential scanning calorime-try (DSC), transmission electron microscopy (TEM), LKSZ kinetic equations, and microhardness testing, the precipitation kinetics was quantitatively characterized. Activation energies of the phase transformations were extracted using the Kissinger analysis of non-isothermal DSC runs conducted at different stationary heating rates. Finally, a first evaluation of the interfacial mobility of precipitates in this alloy was made using the developed methodology.
机译:铸造铝合金零件的热处理可以通过包括固溶,淬火和人工时效在内的最佳顺序来形成和分布纳米级的沉淀物。四元合金特别具有挑战性,本研究旨在了解和概述铸造AlSi_7Cu_(0.5)Mg_(0.3)合金中的析出动力学。使用差示扫描量热法(DSC),透射电子显微镜(TEM),LKSZ动力学方程式和显微硬度测试等技术,对沉淀动力学进行了定量表征。使用在不同的固定加热速率下进行的非等温DSC运行的Kissinger分析,提取了相变的活化能。最后,使用开发的方法对这种合金中析出物的界面迁移率进行了首次评估。

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