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A deformation-processed Al-matrix/Ca-nanofilamentary composite with low density, high strength, and high conductivity

机译:低密度,高强度,高导电性的变形加工Al基/ Ca纳米丝复合材料

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摘要

Light, strong materials with high conductivity are desired for many applications such as power transmission conductors, fly-by-wire systems, and downhole power feeds. However, it is difficult to obtain both high strength and high conductivity simultaneously in a material. In this study, an Al/Ca (20 vol%) nanofilamentary metal-metal composite was produced by powder metallurgy and severe plastic deformation. Fine Ca metal powders (~200 μm) were produced by centrifugal atomization, mixed with pure Al powder, and deformed by warm extrusion, swaging, and wire drawing to a true strain of 12.9. The Ca powder particles became fine Ca nanofilaments that reinforce the composite substantially by interface strengthening. The conductivity of the composite is slightly lower than the rule-of-mixtures prediction due to minor quantities of impurity inclusions. The elevated temperature performance of this composite was also evaluated by differential scanning calorimetry and resistivity measurements.
机译:轻质,高导电性的材料是许多应用所需要的,例如输电导体,电传操纵系统和井下供电。然而,难以在材料中同时获得高强度和高导电率。在这项研究中,通过粉末冶金和严重的塑性变形生产了Al / Ca(20%(体积))纳米丝金属-金属复合材料。通过离心雾化生成细的Ca金属粉(〜200μm),与纯Al粉混合,并通过热挤压,锻造和拉丝变形而变形至真实应变为12.9。 Ca粉末颗粒变成细的Ca纳米丝,其通过界面强化基本上增强了复合材料。由于少量杂质夹杂物,复合材料的电导率略低于混合规则的预测值。还通过差示扫描量热法和电阻率测量来评估该复合材料的高温性能。

著录项

  • 来源
    《Materials Science and Engineering》 |2017年第6期|348-354|共7页
  • 作者单位

    Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA;

    Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA,Ames Laboratory of the US Department of Energy, Ames, IA 50011, USA;

    Technische Universität Berlin, Gustav-Meyer-Allee 25,13355 Berlin, Germany;

    Ames Laboratory of the US Department of Energy, Ames, IA 50011, USA d Technische Universität Berlin, Gustav-Meyer-Allee 25,13355 Berlin, Germany;

    Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA,Ames Laboratory of the US Department of Energy, Ames, IA 50011, USA d Technische Universität Berlin, Gustav-Meyer-Allee 25,13355 Berlin, Germany;

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

    Metal matrix composite (MMCs); Powder processing; Severe plastic deformation Strength; Electrical resistivity/conductivity;

    机译:金属基复合材料(MMC);粉末加工;严重的塑性变形强度;电阻率/电导率;

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