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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.

N
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. (List of Research)

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