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首页> 外文期刊>Journal of Materials Research >Investigation of mechanically activated field-activated pressure-assisted synthesis processing parameters for producing dense nanostructured FeA1
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Investigation of mechanically activated field-activated pressure-assisted synthesis processing parameters for producing dense nanostructured FeA1

机译：机械活化场活化压力辅助合成工艺参数研究制备致密纳米FeA1

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摘要

The parameters of the mechanically activated field-activated pressure-assisted synthesis (MAFAPAS) process, which were recently developed and patented for producing dense nanostructured materials, were studied in the case of the B2-FeAl intermetallic. Based on x-ray diffraction (XRD) experiments, residual stresses XRD analysis, relative density measurement, and secondary-electron microscopic observations, the optimal synthesis conditions (time, current intensity, and pressure) were studied. Fe + Al powders were comilled in a specially designed planetary mill to obtain a mixture of reactants at the nanoscale without the formation of any product. The milled mixtures were then subjected to a high density of alternating current (60 Hz ac, total current 1250 or 1500 A), a uniaxial pressure (70 or 106 MPa), and different times (from 2 to 5 min). This work confirms the reproducibility of the MAFAPAS process, showing the essential role of the mechanical activation step to produce a pure nanostructured material. In addition, the composition and the microstructure of MAFAPAS end-products depended on the processing parameters (time, current density, mechanical pressure). In particular, it was observed that the process of simultaneous synthesis and consolidation of the product introduced a high level of residual stresses. [References: 62]
机译：在B2-FeAl金属间化合物的情况下，研究了机械活化的场活化压力辅助合成（MAFAPAS）工艺的参数，该工艺最近已开发并获得专利，可生产致密的纳米结构材料。基于X射线衍射（XRD）实验，残余应力XRD分析，相对密度测量和二次电子显微镜观察，研究了最佳合成条件（时间，电流强度和压力）。将Fe + Al粉在专门设计的行星式磨机中进行混合，以获得纳米级反应物的混合物，而不会形成任何产物。然后将研磨后的混合物置于高密度的交流电（交流60 Hz，总电流1250或1500 A），单轴压力（70或106 MPa）和不同的时间（2至5分钟）下。这项工作证实了MAFAPAS工艺的可重复性，显示了机械活化步骤生产纯纳米结构材料的重要作用。另外，MAFAPAS终产物的组成和微观结构取决于加工参数（时间，电流密度，机械压力）。特别地，观察到产物的同时合成和固结的过程引入了高水平的残余应力。 [参考：62]

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