Optimization and Characterization of Home Made Ball Mill for Preparing Nano-sized Tungsten Heavy Alloy | ||||
| Egyptian Journal of Solids | ||||
| Article 3, Volume 34, Issue 1, 2011, Page 29-43 PDF (1.72 MB) | ||||
| DOI: 10.21608/ejs.2011.148858 | ||||
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| Abstract | ||||
| A mechanical home made ball mill was constructed in order to prepare nano crystallite size from 90W-7 Ni-3Fe heavy alloy. The parameters of the mechanical alloying process such as milling speed, milling medium, charge ratio and the filling ratio were varied in order to find their influence on the mill efficiency. It was found that the optimum parameters for the milling process at which the crystallite size decreased faster, the contaminations are minimized, the milling speed is adequate and the filling factor is justified are only obtained by using; rods as a milling medium instead of using balls, milling speed to be 175 rpm, charge ratio is 20:1 and the filling factor is 30 %. XRD was taken for all the samples milled at different times in order to see the different XRD pattern steps of the alloy formation. From Rietveld refinements it was possible to get the structural parameters, the crystallite size and the microstrain. These results were correlated with each other and with similar results obtained from the TEM. The energy dispersive X-Ray (EDX) results confirmed the weight percentage of the different elements and the homogeneity of the elemental powders in the resulting alloy. | ||||
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