Abstract
Samples of Nb-25Cr alloy were ball milled for durations of 12h, 24h, 36h and 48h. The effect of processing time on the microstructure and microhardness of Nb-25Cr alloy was investigated. The experimental results show that a deformation layer is obtained on the surface of the treated Nb-25Cr alloy samples. The deformation layer thickness correlates directly with the processing time. The ball milling treatment led to the emergence of cracks on the surface of the 48h treated specimen due to strain and strain rate. Broad width XRD (X-ray diffraction) peaks with weak intensity and FWHM (full width at half-maximum) increasement indicate that the surface microstructure of Nb-25Cr alloy is refined. A gradual microstructure refinement on the surface of Nb-25Cr alloy is observed, corresponding to the higher strain energy introduced into the surface layer with extended processing times. Improvement in microhardness of Nb-25Cr alloy is due to microstructure refinement and work hardening effects. The microhardness of the 48h treated specimen fell abruptly due to the cracks on the sample surface.
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