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首页> 外文会议>Symposium on Structure and Mechanical Properties of Nanophase Materials- Theory and Computer Simulation vs. Experiment Nov 28-30, 2000, Boston, Massachusetts, U.S.A. >Stacking Faults Created by Mechanical Milling in Nanostructured WC-Co Composite Powder
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Stacking Faults Created by Mechanical Milling in Nanostructured WC-Co Composite Powder

机译：机械研磨在纳米结构WC-Co复合粉末中产生的堆垛层错

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摘要

Nanostructured WC-Co powders obtained by mechanical milling were investigated by combination of X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) techniques. HRTEM image analysis shows that in the as-milled nanostructured powder, many WC grains contain stacking faults lying on the plane{10.0}. Analysis of phase images showed that these defects were nearly periodically ordered along the [10.0] direction. Based on these observations, a structural model is proposed for the WC grains with ordered stacking faults, which is in fact equivalent to a superstructure of WC with space group Amm2. When this model is introduced together with the normal WC structure (space group P 6 m2) into the Rietveld refinement, a much better agreement between the calculated and experimental XRD profiles is obtained. This study allowed obtaining the lattice parameters, grain size, microstrain and other structural information on the as-milled powders.
机译：结合X射线衍射（XRD）和高分辨率透射电子显微镜（HRTEM）技术研究了通过机械研磨获得的纳米结构WC-Co粉。 HRTEM图像分析表明，在研磨后的纳米结构粉末中，许多WC晶粒包含位于平面上的堆积缺陷{10.0}。相图分析表明，这些缺陷几乎沿着[10.0]方向周期性排列。基于这些观察结果，提出了具有有序堆垛层错的WC晶粒的结构模型，实际上与具有空间群Amm2的WC的上部结构等效。当将此模型与常规WC结构（空间群P 6 m2）一起引入Rietveld改进时，可以在计算出的XRD曲线和实验XRD曲线之间获得更好的一致性。这项研究允许获得研磨后的粉末的晶格参数，晶粒尺寸，微应变和其他结构信息。

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