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首页> 外文期刊>Materials Science and Engineering >Elevated temperature mechanical behaviour of nanoquasicrystalline Al_(93)Fe_3Cr_2Ti_2 alloy and composites
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Elevated temperature mechanical behaviour of nanoquasicrystalline Al_(93)Fe_3Cr_2Ti_2 alloy and composites

机译：纳米准晶Al_（93）Fe_3Cr_2Ti_2合金及其复合材料的高温力学行为

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摘要

Rapidly solidified nano-quasiciystalline Al_(93)Fe_3Cr_2Ti_2 at% alloy has previously shown outstanding tensile and compressive strength and microstructural stability up to elevated temperatures. Despite this, no study had previously assessed the effect of plastic deformation at elevated temperature to simulate thermal-mechanical forging processes for the production of engineering components. The present work analysed bars consisting of a nano-quasicrystalline Al_(93)Fe_3Cr_2Ti_2 at% alloy matrix, with the addition of 10 and 20 vol% pure Al ductilising fibres, produced through gas atomisation and warm extrusion. The microstructure was made primarily of nanometre-sized icosahedral particles in an α-Al matrix. Compression tests were performed across a range of temperatures and strain rates. The measured yield strength at 350 ℃ was over 3x that of "high strength" 7075 T6 Al alloy, showing outstanding thermal stability and mechanical performance. However, the microstructure was shown by XRD to undergo a phase transformation which resulted in the decomposition of the icosahedral phase around ~500 ℃ into more stable intermetallic phases. Serrated flow associated with dynamic strain ageing was observed and a semi-quantitative analysis matching elemental diffusion speeds with dislocation speed at specific strain rates was performed, which tentatively identified Ti as the solute species responsible within the selected range of temperatures and strain rates.
机译：快速凝固的纳米准晶体Al_（93）Fe_3Cr_2Ti_2 at％合金以前显示出出色的拉伸和压缩强度以及在高温下的微观结构稳定性。尽管如此，以前还没有研究评估升高的塑性变形对模拟热机械锻造工艺来生产工程部件的影响。本工作分析了由纳米准晶Al_（93）Fe_3Cr_2Ti_2 at％合金基体以及通过气体雾化和热挤压产生的10和20 vol％的纯铝延展纤维组成的棒。微观结构主要由α-Al基体中的纳米级二十面体颗粒组成。在一系列温度和应变速率下进行了压缩测试。在350℃下测得的屈服强度是“高强度” 7075 T6铝合金的3倍以上，表现出出色的热稳定性和机械性能。然而，X射线衍射表明该组织发生了相变，导致约500℃左右的二十面体相分解为更稳定的金属间相。观察到与动态应变老化相关的锯齿状流，并进行了半定量分析，该分析将元素扩散速度与在特定应变速率下的位错速度相匹配，从而初步确定Ti是在所选温度和应变速率范围内起作用的溶质。

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  • 来源
    《Materials Science and Engineering》 |2017年第29期|352-359|共8页
  • 作者

    S. Pedrazzini; M. Galano; F. Audebert; G.D.W. Smith;

  • 作者单位

    Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, CB3 OFS Cambridge, UK,Department of Materials, University of Oxford, Parks Road, 0X1 3PH Oxford, UK;

    Department of Materials, University of Oxford, Parks Road, 0X1 3PH Oxford, UK;

    Department of Materials, University of Oxford, Parks Road, 0X1 3PH Oxford, UK,Advanced Materials Group, INTECIN (CONCET-UBA), Facvltad de Ingenierta, Uniyersidad de Buenos Aires, Paseo Colon 850, Buenos Aires 1063, Argentina,Department of Mechanical Engineering and Mathematical Sciences, Oxford Brookes University, Wheatley Campus, 0X33 1HX Oxford, UK;

    Department of Materials, University of Oxford, Parks Road, 0X1 3PH Oxford, UK;

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

    Quasicrystals; Aluminium; Fibre composite; Dynamic strain ageing; Mechanical properties;

    机译：准晶体;铝;纤维复合材料;动态应变老化;机械性能;

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