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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Structural and thermal study of nanostructured Cr80Co10Si10 mixture
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Structural and thermal study of nanostructured Cr80Co10Si10 mixture

机译：纳米Cr80Co10Si10混合物的结构和热研究

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摘要

Structural evolution during milling process of Cr80Co10Si10 (wt.%) mixture was followed by the combination of the scanning electron microscopy (SEM) and X-ray diffraction (XRD). The structural parameters of different phases were deduced from the Rietveld refinement of the XRD patterns using the MAUD program. The thermal stability of the obtained powders was investigated by the differential scanning calorimetry (DSC). The Rietveld refinement of XRD patterns shows that the obtained mixture after 24 h of milling consists in nanocrystalline bcc-Cr(Co, Si) solid solution and amorphous-like phase. The DSC scans give evidence of exothermic reactions corresponding to structural relaxation, grain growth and crystallization of the disordered mixture. The annealing of the 24 h-milled powders induces the crystallization of the amorphous part of the mixture. The activation energy determined from Kissenger's model is found to be 259.36 +/- 11.16 kJ/mol. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
机译：Cr80Co10Si10（wt。％）混合物在研磨过程中的结构演变是通过扫描电子显微镜（SEM）和X射线衍射（XRD）的结合进行的。使用MAUD程序从XRD图案的Rietveld精炼中推导出了不同相的结构参数。通过差示扫描量热法（DSC）研究获得的粉末的热稳定性。 XRD图谱的Rietveld细化表明，研磨24小时后获得的混合物包含纳米晶bcc-Cr（Co，Si）固溶体和非晶态相。 DSC扫描提供了放热反应的证据，该放热反应对应于无序混合物的结构松弛，晶粒生长和结晶。 24 h研磨的粉末的退火引起混合物中非晶态部分的结晶。根据基辛格模型确定的活化能为259.36 +/- 11.16 kJ / mol。 （C）2016日本粉末技术学会。由Elsevier B.V.和日本粉末技术学会出版。版权所有。

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