التفاصيل البيبلوغرافية
| العنوان: |
Investigation of mechanically activated field-activated pressure-assisted synthesis processing parameters for producing dense nanostructured FeAl. |
| المؤلفون: |
Paris, S., Valot, Ch., Gosmain, L., Gaffet, E., Bernard, F., Munir, Z. |
| المصدر: |
Journal of Materials Research; Oct2003, Vol. 18 Issue 10, p2331, 8p |
| مصطلحات موضوعية: |
NANOSTRUCTURED materials, IRON, ALUMINUM, X-ray diffraction, ELECTRON microscopy, RESIDUAL stresses |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |