Morphology and structural evaluation of chromium powder during mechanical milling

Morphology and Structural Evaluation of Chromium Powder during Mechanical Milling. Chromium plays an important role in improving the high temp oxidation in ODS (Oxide Dispersion Strengthened) alloy due to corrosion resistance. The length of time during mechanical milling of chromium as a dispersion in ferritic steel matrix plays important role. In this study, we investigated the different milling times to understand the microstructure and properties of Chromium powders using Scanning Electron Microscope – Energy Dispersive X-Ray Spectroscopy (SEM-EDS) and X-ray Diffraction (XRD). The results show, as a function of milling time, severe plastic deformation (SPD), and fracture stage occur in the first stage of milling until 3 hours of milling. In 4 until 5 hours of milling, the SPD and cold welding occur. After 5 hours of milling, fracture stage occurs, the shape of particles became smaller and finer. The crystallite size and d-spacing also decrease drastically with milling time.