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首页> 外文会议>Powder metallurgy world congress amp; exhibition >The Influence of Technological Parameters on the Phase Nucleation During Heating of Iron and Aluminum Powders in Isothermal Conditions
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The Influence of Technological Parameters on the Phase Nucleation During Heating of Iron and Aluminum Powders in Isothermal Conditions

机译：等温条件下工艺参数对铁铝粉加热过程中相形核的影响

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摘要

The kinetics of Fe-AI intermetallic phase transformation preceding the SHS reaction for isothermal conditions was investigated by DSC technique. Johnson-Mehl-Avrami (JMA) model was used to calculate basic kinetics parameters such as Avrami exponent, which characterise rate and the way of particular phase nucleation. Activation energy (E_a) of particular phase formation was determined by the Kissinger method. Investigations of sintered materials just before SHS reaction confirmed by SEM technique and XRD analysis shown, that not only Fe_2AI_5 phase and solid solution aluminum in iron but also high aluminum phases FeAI_2 and FeAI_3 are formed prior to the ignition of the synthesis. Performed tests have shown a strong influence of sintering process temperature on the phase transformation. In connection with occurring phase formation, the changes of microhardness were observed.
机译：通过DSC技术研究了在等温条件下SHS反应之前Fe-Al金属间相变的动力学。 Johnson-Mehl-Avrami（JMA）模型用于计算基本动力学参数，例如Avrami指数，这些参数表征速率和特定相成核的方式。通过基辛格方法确定特定相形成的活化能（E_a）。通过SEM技术和XRD分析证实，在进行SHS反应之前对烧结材料的研究表明，不仅在合成点火之前形成了Fe_2Al_5相和铁中的固溶铝，而且还形成了高铝相FeAI_2和FeAI_3。进行的测试表明，烧结过程温度对相变的影响很大。与发生的相形成有关，观察到显微硬度的变化。

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  • 来源
  • 会议地点 Florence(IT);Florence(IT)
  • 作者

    Ewelina Pochec; Stanislaw Jozwiak; Krzysztof Karczewski; Zbigniew Bojar;

  • 作者单位

    Department of Advanced Materials and Technology, Military University of Technology Kaliskiego 2 St., 00-908 Warsaw,Poland;

    rnDepartment of Advanced Materials and Technology, Military University of Technology Kaliskiego 2 St., 00-908 Warsaw,Poland;

    rnDepartment of Advanced Materials and Technology, Military University of Technology Kaliskiego 2 St., 00-908 Warsaw,Poland;

    rnDepartment of Advanced Materials and Technology, Military University of Technology Kaliskiego 2 St., 00-908 Warsaw,Poland;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 粉末冶金（金属陶瓷工艺）;
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