Fig. 3 shows the XRD pattern of the sintered sample containing
6% additive. The Rietveld analysis of the XRD data depicted the
formation of a single-phase austenitic structure after sintering, as
confirmed with ferritoscopic measurements. Note that to have an
austenitic structure, after sintering at 1050 C, the samples were
water-quenched. In addition, the mean crystallite size was
measured to be less than 50 nm, where mechanical alloying had
been previously created the nanostructured powders [10–15]. This
nanoscale structure, even after the sintering process, have been also
verified by microscopic studies [6,7], reflecting a significant resistance
to grain growth. The solute drag effect combined with the
contribution of carbon and nitrogen are expected to be responsible
for the retarded grain growth in this material. The solubility of
nitrogen and carbon atoms in crystals is limited; therefore, they
segregate at grain boundaries [16–18] and retard grain boundary
mobility at high temperatures [18–21].
Fig. 3 shows the XRD pattern of the sintered sample containing6% additive. The Rietveld analysis of the XRD data depicted theformation of a single-phase austenitic structure after sintering, asconfirmed with ferritoscopic measurements. Note that to have anaustenitic structure, after sintering at 1050 C, the samples werewater-quenched. In addition, the mean crystallite size wasmeasured to be less than 50 nm, where mechanical alloying hadbeen previously created the nanostructured powders [10–15]. Thisnanoscale structure, even after the sintering process, have been alsoverified by microscopic studies [6,7], reflecting a significant resistanceto grain growth. The solute drag effect combined with thecontribution of carbon and nitrogen are expected to be responsiblefor the retarded grain growth in this material. The solubility ofnitrogen and carbon atoms in crystals is limited; therefore, theysegregate at grain boundaries [16–18] and retard grain boundarymobility at high temperatures [18–21].
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