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首页> 外文期刊>Materials Science and Engineering >Strengthening in hybrid alumina-titanium diboride aluminum matrix composites synthesized by ultrasonic assisted reactive mechanical mixing
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Strengthening in hybrid alumina-titanium diboride aluminum matrix composites synthesized by ultrasonic assisted reactive mechanical mixing

机译：超声辅助反应机械混合法合成氧化铝-二硼化钛铝基复合材料的强化

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摘要

A novel ultrasonic assisted in-situ stir mixing method, in which the reinforcements are synthesized in liquid aluminum, has been used to fabricate surface clean nano- or submicron-sized particulates in pure aluminum matrix. An exothermic reaction was designed to synthesize Al_2O_3 and TiB_2 nanoparticles from TiO_2 particles and elemental boron in an aluminum melt. Subsequently, the refining power of the nanoparticles in the metallic matrix has been investigated. Experimental and theoretical analysis show that the particle size and refining power of nanoparticles is controlled by the viscosity of the melt, rather than precipitation and growth. A model is proposed to describe the effect of processing variables to the refining power of nanoparticles. Subsequently, the tensile properties were measured to determine the strengthening mechanisms responsible for the change in properties of these materials. Experimental data combined with theoretical analysis suggest that both grain boundary strengthening and Orowan strengthening seem to account for the strength in the nanocomposites.%Aluminum; Nanocomposites; In-situ Casting; Strengthening mechanisms; Grain refinement
机译：一种新颖的超声辅助原位搅拌混合方法，其中在液态铝中合成增强材料，已被用于在纯铝基体中制造表面清洁的纳米级或亚微米级颗粒。设计了放热反应，由铝熔体中的TiO_2颗粒和元素硼合成Al_2O_3和TiB_2纳米颗粒。随后，已经研究了金属基质中纳米颗粒的提纯能力。实验和理论分析表明，纳米粒子的粒径和细化能力是由熔体的粘度控制的，而不是由沉淀和生长控制的。提出了一个模型来描述加工变量对纳米颗粒细化能力的影响。随后，测量拉伸性能以确定引起这些材料性能变化的强化机理。实验数据与理论分析相结合表明，晶界强化和Orowan强化似乎都说明了纳米复合材料的强度。纳米复合材料；原地铸造加强机制；晶粒细化

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  • 来源
    《Materials Science and Engineering》 |2017年第15期|312-321|共10页
  • 作者

    Afsaneh Dorri Moghadam; Emad Omrani; Hugo Lopez; Le Zhou; Yongho Sohn; Pradeep K. Rohatgi;

  • 作者单位

    Department of Materials Science and Engineering College of Engineering & Applied Science, University of Wisconsin, Milwaukee,WI 53211, USA;

    Department of Materials Science and Engineering College of Engineering & Applied Science, University of Wisconsin, Milwaukee,WI 53211, USA;

    Department of Materials Science and Engineering College of Engineering & Applied Science, University of Wisconsin, Milwaukee,WI 53211, USA;

    Department of Materials Science and Engineering and Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, FL 32816, USA;

    Department of Materials Science and Engineering and Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, FL 32816, USA;

    Department of Materials Science and Engineering College of Engineering & Applied Science, University of Wisconsin, Milwaukee,WI 53211, USA;

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  • 正文语种 eng
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  • 关键词

    Aluminum; Nanocomposites; In-situ Casting; Strengthening mechanisms; Grain refinement;

    机译：铝;纳米复合材料;原地铸造加强机制;晶粒细化;

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