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Two Fe–1.5 wt.%Mo powdered alloys modified with 1.5 wt.%SiO2 and 1.5 wt.%TiO2 compacted through spark plasma sintering have been studied. Transmission electron microscopy was used to characterize the nano-scale microstructure. The results showed that sintered FeMo + SiO2 powder is able to keep a nanometric scale grained structure up to a sintering temperature of 815 °C. Mean grain size of the FeMo + TiO2 compacted powder maintained its nanometric range up to 900 °C. Residual porosity decorates the grain boundary and the triple grain junctions in all the studied sintering conditions. Moreover, nano-porosity accounted for a maximum of 0.26% volume fraction. Direct comparison between X-ray diffraction grain size evaluation (from previously published data) and transmission electron microscopy investigations, showed a significant underestimation when using the first approach. Nano-indentation …
Publication date: 
25 Nov 2008

M Cabibbo, C Paternoster, R Cecchini, A Fabrizi, A Molinari, S Libardi, M Zadra

Biblio References: 
Volume: 496 Issue: 1-2 Pages: 121-132
Materials Science and Engineering: A