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Al-TiB_2 microanocomposites: Particle capture investigations,strengthening mechanisms and mathematical modelling of mechanical properties

机译：Al-TiB_2微米/纳米复合材料：粒子捕获研究，增强机制和力学性能的数学模型

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摘要

The interactions between suspended ceramic particles in composite slurry and advancing solidification front take place during liquid state processing of particle reinforced metal matrix composites. The introduced solidification models in this research propose the possibility of nanoparticle engulfment by solidification front during gravity casting of molten composite. Results indicate that the strengthening mechanisms are considerably affected by the degree of particle engulfment and the quality of particle distribution in solid matrix. Microstructural studies show that nanoparticles are either engulfed inside metal grains or pushed by solidification front into the aluminum-silicon interface. The comparison of mechanical properties with the changes of secondary dendrite arm spacing proposes the dominance of Orowan strengthening mechanism in the samples reinforced by 0.5 vol% nanoparticles. The highest tensile properties are achieved in the composites reinforced by 1.5 vol% TiB_2 nanoparticles. Experimental results of mechanical tests are constructed to create a multi-input and multi-output model by using a Neural Networks-Levenberg Marquardt Algorithm (NN-LMA). It is reported that the NN- LMA model is highly accurate (the margin of error is less than 5%) to predict the mechanical properties of Al-TiB_2 composites.
机译：复合浆料中的悬浮陶瓷颗粒与前进的凝固前沿之间的相互作用发生在颗粒增强金属基复合材料的液态加工过程中。在本研究中引入的凝固模型提出了在重力铸造熔融复合材料的过程中通过凝固前沿将纳米粒子吞噬的可能性。结果表明，强化机理受颗粒吞噬程度和固体基质中颗粒分布质量的影响。微观结构研究表明，纳米颗粒要么被金属颗粒吞噬，要么被凝固前沿推入铝硅界面。力学性能与次生枝晶臂间距变化的比较表明，在由0.5％（体积）纳米颗粒增强的样品中，Orowan增强机理占主导地位。在1.5％（体积）的TiB_2纳米颗粒增强的复合材料中获得了最高的拉伸性能。通过使用神经网络-Levenberg Marquardt算法（NN-LMA）构建机械测试的实验结果，以创建多输入多输出模型。据报道，NN-LMA模型是高度准确的（误差范围小于5％），可以预测Al-TiB_2复合材料的力学性能。

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  • 来源
    《Materials Science and Engineering》 |2017年第13期|98-106|共9页
  • 作者

    Mohammad Karbalaei Akbari; Kamyar Shirvanimoghaddam; Zhenyin Hai; Serge Zhuiykov; Hamid Khayyam;

  • 作者单位

    University Of Ghent Global Campus, Department of Applied Analytical & Physical Chemistry, Faculty of Bioscience Engineering, Incheon, South Korea;

    Institute for Frontier Materials, Carbon Nexus, Deakin University, Geelong, Victoria 3216, Australia;

    University Of Ghent Global Campus, Department of Applied Analytical & Physical Chemistry, Faculty of Bioscience Engineering, Incheon, South Korea;

    University Of Ghent Global Campus, Department of Applied Analytical & Physical Chemistry, Faculty of Bioscience Engineering, Incheon, South Korea;

    Institute for Frontier Materials, Carbon Nexus, Deakin University, Geelong, Victoria 3216, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aluminum composites; Casting; Wettability; Mechanical properties; Modelling;

    机译：铝复合材料;铸件;润湿性机械性能造型;

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