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首页> 外文会议>International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials(ISMANAM 2003); 20030824-20030828; Foz do Lguacu; BR >Structural Effects on the Kinetics of Mechanically Induced Nitriding
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Structural Effects on the Kinetics of Mechanically Induced Nitriding

机译：机械诱导渗氮动力学的结构效应

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摘要

It is well known that milling of Zr, Hf and other refractory metals under nitrogen atmosphere induce the formation of nanocrystalline nitride phases. Previous kinetics studies have shown that the absorption curve follows a single sigmoidal shape irrespective of the milling intensity, which in turns strongly influence the reaction rate. In this work we explore the effect of structure on the kinetics, by means of a detailed study of the nitriding of cubic Hf_2Fe compound and its comparison with hexagonal Hf and Zr and tetragonal Zr_2Fe. The absorption curve shown a slight shoulder at n=0.25 followed by a second acceleratory stage that didnot saturate after 10 hours of milling. The structural characterization indicated that under milling, Hf_2Fe forms an interstitial solid solution (η-phase), with N atoms occupying the octahedral interstices, delimited by Hf atoms, before its transformation to the cubic δ-HfN structure. It is worth to note that the number of octahedral interstices per Hf atom is 0.25 and 1 in the η and δ structures respectively, evidencing clearly the influence of structure on the nitriding rate.
机译：众所周知，在氮气氛下研磨Zr，Hf和其他难熔金属会诱导形成纳米晶氮化物相。先前的动力学研究表明，吸收曲线遵循单一的S形，而与研磨强度无关，这反过来会严重影响反应速率。在这项工作中，我们通过详细研究立方Hf_2Fe化合物的氮化及其与六方Hf和Zr以及四方Zr_2Fe的比较，探索了结构对动力学的影响。吸收曲线显示在n = 0.25处有轻微的肩峰，随后是第二个加速阶段，该阶段在研磨10小时后并未饱和。结构表征表明，在研磨过程中，Hf_2Fe形成间隙固溶体（η相），N原子占据八面体间隙，由Hf原子界定，然后转变为立方δ-HfN结构。值得注意的是，每个Hf原子在η和δ结构中的八面体间隙数分别为0.25和1，清楚地证明了结构对氮化速率的影响。

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