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首页> 外文期刊>ISIJ international >Fabrication of TiB_2 Particle Dispersed FeAl-based Composites by Self-propagating High-temperature Synthesis
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Fabrication of TiB_2 Particle Dispersed FeAl-based Composites by Self-propagating High-temperature Synthesis

机译：自蔓延高温合成法制备TiB_2颗粒分散FeAl基复合材料

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摘要

FeAI-TiB_2 composites have been produced from mixtures of Fe, Al, Ti and B powders using the Self-propagating High-temperature Synthesis (SHS or combustion synthesis) method. When the powder mixture was heated in vacuum to approximately 900 K, an abrupt increase in temperature was observed, indicating that the SHS reaction occurred in the powder mixture. The treating time from the start of heating to the end of the exothermic reaction was only approximately two minutes. X-ray diffraction analyses revealed that the SHS sample consisted of only FeAl and TiB_2 without any elemental metals and any other compounds. Metallographic investigations using a scanning electron microscope and an electron probe microanalysis revealed that fine TiB_2 particles were dispersed in FeAl matrix phase. As the volume fraction of the TiB_2 particles was increased from 0.3 to 0.8 by controlling the powder mixture composition, the average TiB_2 particle size increased from 1 to 7mum and the average Vickers hardness of the composites increased from 800 to 1 600.
机译：FeAI-TiB_2复合材料是使用自蔓延高温合成（SHS或燃烧合成）方法由铁，铝，钛和硼粉末的混合物制成的。将粉末混合物在真空中加热至约900 K时，观察到温度突然升高，表明在粉末混合物中发生了SHS反应。从加热开始到放热反应结束的处理时间仅约两分钟。 X射线衍射分析表明，SHS样品仅由FeAl和TiB_2组成，没有任何元素金属和任何其他化合物。使用扫描电子显微镜和电子探针显微分析的金相研究表明，细小的TiB_2颗粒分散在FeAl基体相中。通过控制粉末混合物组成将TiB_2颗粒的体积分数从0.3增加到0.8，平均TiB_2颗粒大小从1增加到7微米，复合材料的平均维氏硬度从800增加到1600。

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