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Nanoparticle interactions with the magnesium alloy matrix during physical deformation: Tougher nanocomposites

机译：物理变形过程中纳米粒子与镁合金基体的相互作用：更坚韧的纳米复合材料

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摘要

This study is aimed at understanding the toughness enhancing function of nanoparticles in magnesium nanocomposites, focussing on experimentally observed nanoparticle-matrix interactions during physical deformation. Al_2O_3 nanoparticles were selected for reinforcement purposes due to the well known affinity between magnesium and oxygen. AZ31/AZ91 (hybrid alloy) and ZK60A magnesium alloys were reinforced with Al_2O_3 nanoparticles using solidification processing followed by hot extrusion. In tension, each nanocomposite exhibited higher ultimate strength and ductility than the corresponding monolithic alloy. However, the increase in ductility exhibited by ZK6OA/Al_2O_3 (+170%) was significantly higher than that exhibited by AZ31/AZ91/Al_2O_3 (+99%). The previously unreported and novel formation of high strain zones (HSZs, from nanoparticle surfaces inclusive) during tensile deformation is highlighted here as a significant mechanism supporting ductility enhancement in ZK6OA/Al_2O_3 (+170% enhanced) and AZ31/ AZ91/Al_2O_3 (+99% enhanced) nanocomposites. Also, ZK6OA/Al_2O_3 exhibited lower and higher compressive strength and ductility (respectively) compared to ZK60A while AZ31/AZ91/Al_2O_3 exhibited higher and unchanged compressive strength and ductility (respectively) compared to AZ31/AZ91. Here, the previously unreported nanograin formation (recrystallization) during room temperature compressive deformation as a toughening mechanism in relation to nanoparticle stimulated nucleation (NSN) ability is also highlighted.
机译：这项研究旨在了解镁纳米复合材料中纳米颗粒的韧性增强功能，重点是在物理变形过程中通过实验观察到的纳米颗粒与基质之间的相互作用。由于镁和氧之间的众所周知的亲和力，选择Al_2O_3纳米颗粒用于增强目的。 AZ31 / AZ91（混合合金）和ZK60A镁合金采用Al_2O_3纳米颗粒通过固化工艺随后热挤压来增强。在张力方面，每种纳米复合材料均比相应的整体合金具有更高的极限强度和延展性。但是，ZK60A / Al_2O_3表现出的延展性增加（+ 170％）显着高于AZ31 / AZ91 / Al_2O_3表现出的延展性（+ 99％）。本文重点介绍了拉伸变形过程中高应变区（HSZ，包括纳米颗粒表面）以前未报道的新颖形成，这是支持ZK60A / Al_2O_3（提高了170％）和AZ31 / AZ91 / Al_2O_3（+99）的延展性的重要机制。增强百分比）纳米复合材料。此外，与ZK60A相比，ZK60A / Al_2O_3分别具有较低和较高的抗压强度和延展性，而与AZ31 / AZ91相比，AZ31 / AZ91 / Al_2O_3分别具有较高且不变的抗压强度和延展性。在这里，还强调了以前未报道的在室温压缩变形过程中形成的纳米颗粒（再结晶），作为与纳米颗粒激发成核（NSN）能力有关的增韧机理。

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  • 来源
    《Materials Chemistry and Physics》 |2013年第2期|472-482|共11页
  • 作者

    M. Paramsothy; J. Chan; R. Kwok; M. Gupta;

  • 作者单位

    Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore;

    Singapore Technologies Kinetics Ltd (ST Kinetics), 249 Jalan Boon Lay, Singapore 619523, Singapore;

    Singapore Technologies Kinetics Ltd (ST Kinetics), 249 Jalan Boon Lay, Singapore 619523, Singapore;

    Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Composite materials; Nanostructures; Transmission electron microscopy (TEM); Dislocations; Nucleation; Ductility;

    机译：复合材料;纳米结构;透射电子显微镜（TEM）;脱位;成核;延展性;

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