Synthesis and Characterization of Nanostructured Tungsten-30 atomic % Chromium produced by Mechanical attrition and Hydrogen
sintering, Anshuman. Patra,* Swapan Kumar Karak, Shyamal Kumar Pabi, Department of Metallurgical and Materials Engineering, NIT Rourkela, Department
of Metallurgical and Materials Engineering, IIT Kharagpur.
anostructured W70Cr30 powders were produced by mechanical alloying (MA) of elemental tungsten (W), Chromium (Cr) powders in a high energy
planetary ball-mill using tungsten carbide as grinding media and toluene as a process control agent. The crystallite size and lattice strain of
the nanostructured powders
at different milling time (0 h to 10 h) was calculated from X -ray diffraction patterns (XRD). The crystallite size
of W in W70Cr30 powder reduced from 100 μm at 0 h to 32.8 nm at 10 h of milling with increase in lattice strain of
0.43% at 10 h of milling. The lattice parameter of tungsten shows initial expansion of lattice up to 0.56% at 5 h of
milling and contraction of lattice up to 0.93% at 10 h of milling. The scanning electron microscopy (SEM) micrograph
also revealed mixed morphology of elemental W and Cr powders consist of spherical and elongated particles during mechanical alloying.
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