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A. I. YURKOVA, O. V. BILOTS’KY, A. V. BYAKOVA, and Yu. V. MILMAN
«Mechanical Properties of Nanostructured Iron Produced by Severe Plastic Deformation by Friction »
PACS numbers: 07.35.+k, 61.72.Hh, 62.20.de, 62.20.fq, 62.20.Qp, 81.40.Pq, 81.65.Lp
By using nanoindentation technique, the role of grain refinement down to nanometre sizes in terms of its influence on mechanical parameters (hardness, Hh, plasticity characteristic, ?A, and Young’s modulus, E) of ?-Fe subjected to severe plastic deformation by friction (SPDF) with argon atmosphere is studied. In comparison with Fe of coarse-grained structure, Young’s modulus decreases by 10% when grain size decreases down to less then 30 nm. Unlike f.c.c. metals for which decreasing the grain size down to 20 nm results in gradual increasing of the hardness values and, therefore, in decreasing of the plasticity, the reverse effect is believed to be true for b.c.c. Fe, namely, the decreasing of grains sizes within the range from 50 to 20 nm causes the hardness-values decreasing from 5.8 to 3.7 GPа, while plasticity characteristic increases from 0.82 to 0.87.