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Young's modulus of nanocrystalline Fe measured by nanoindentation

1995; Elsevier BV; Volume: 204; Issue: 1-2 Linguagem: Inglês

10.1016/0921-5093(95)09927-1

1873-4936

G.E. Fougere, L. Riester, M. K. Ferber, J. Weertman, R.W. Siegel,

Microstructure and mechanical properties

Nanoindentation techniques were used to measure Young's modulus for nanocrystalline Fe samples produced by inert-gas condensation and warm consolidation. The samples had grain sizes of 4–20 nm and residual porosity of 2–30% calculated relative to conventional Fe. Values of Young's modulus for the nanocrystalline Fe are reduced relative to that of conventional, fully dense Fe. A review of Young's modulus for other nanocrystalline materials showed similar trends. Published results for porous conventional Fe showed similar reductions in Young's modulus for samples with comparable porosity levels. The observed reductions in Young's modulus for both the nanocrystalline and the conventional porous Fe can be described adequately by several theories utilizing spheroidal porosity.