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Effect of solidification rate on pore connectivity of aluminium foams and its consequences on mechanical properties

机译：凝固速率对泡沫铝孔连通性的影响及其对机械性能的影响

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摘要

This study evaluates the influence of solidification rate on the generation and control of pore connectivity of closed-cell aluminium foams. Additionally, it gives the experimental support to evaluate and model the effect of this pore connectivity on the mechanical properties. A collection of AlSilO foams produced via powder metallurgy route, with porosities between 0.65 and 0.85, were examined. During production, applied heating conditions were the same in all cases but the cooling conditions were varied in order to promote different solidification rates in a wide range (from -1 to -15 K/s). Structural characterisation was performed by gas pycnometry and X-ray microtomography while the mechanical properties were evaluated by microhardness measurements and uniaxial compression tests. Results showed a clear reduction of pore connectivity when increasing the solidification rate. The consequence is a prominent improvement of the foam strength over the one expected from just the matrix refinement. Further analysis on this relationship between the pore connectivity and the mechanical properties, has allowed to propose a correction to the theoretical model for collapse strength in closed cell foams to consider such contribution and predict more accurate results.
机译：这项研究评估了凝固速率对闭孔泡沫铝的孔连通性的产生和控制的影响。此外，它为评估和建模此孔连通性对机械性能的影响提供了实验支持。检查了通过粉末冶金路线生产的AlSilO泡沫的集合，其孔隙率在0.65和0.85之间。在生产过程中，所施加的加热条件在所有情况下都是相同的，但是为了在宽范围内（从-1至-15 K / s）促进不同的固化速率，改变了冷却条件。通过气体比重瓶法和X射线显微断层照相术进行结构表征，同时通过显微硬度测量和单轴压缩试验评估机械性能。结果表明，提高凝固速率时，孔连通性明显降低。结果是泡沫强度比仅基质改良所预期的泡沫强度有了显着提高。对孔连通性和机械性能之间这种关系的进一步分析，已经允许对闭孔泡沫的塌陷强度理论模型提出修正，以考虑这种贡献并预测更准确的结果。

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  • 来源
    《Materials Science and Engineering》 |2016年第30期|236-246|共11页
  • 作者

    J. Lazaro; E. Solorzano; M.A. Rodriguez-Perez; A.R. Kennedy;

  • 作者单位

    Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, Science Faculty, University of Valladolid, Paseo de Belen 7, 47011 Valladolid, Spain;

    Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, Science Faculty, University of Valladolid, Paseo de Belen 7, 47011 Valladolid, Spain;

    Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, Science Faculty, University of Valladolid, Paseo de Belen 7, 47011 Valladolid, Spain;

    Manufacturing Research Group, Faculty of Engineering, University of Nottingham, University Park, NG7 2RD Nottingham, UK;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Aluminium foam; Solidification; Pore connectivity; Mechanical properties; Modelling;

    机译：泡沫铝凝固;孔连通性;机械性能造型;

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