Ion-irradiation induced damage in FeCr alloys characterized by nanoindentation


Ion-irradiation induced damage in FeCr alloys characterized by nanoindentation

Heintze, C.; Bergner, F.; Hernández-Mayoral, M.

Self-ion irradiation in combination with nanoindentation offers the possibility to characterize irradiation damage in a broad range of irradiation temperature and fluence. Nanoindentation results are reported for binary FeCr alloys of commercial purity with nominal chromium contents of 2.5, 9 and 12 at%. The irradiation conditions considered include irradiations at room temperature, 300°C and 500°C. Special features of this work are roughly rectangular damage profiles produced by multi-step irradiations with different ion energies and exploitation of the load dependence of hardness for indentation loads in the range of 2 to 500 mN. The effects of Cr content, fluence and irradiation temperature are discussed. Irradiation-induced changes of the microstructure were characterized by means of transmission electron microscopy (TEM). Hardening features and their contribution to the observed irradiation-induced hardness changes will be discussed in the framework of a tentative two-feature hardening model. Small-angle neutron scattering (SANS) data reported for neutron-irradiated conditions of the same alloys will be taken into account.

Keywords: Self-ion irradiation; nanoindentation; TEM; irradiation hardening; FeCr alloys

  • Invited lecture (Conferences)
    CAARI 2012 - 22nd International Conference on the Application of Accelerators in Research and Industry, 05.-10.08.2012, Fort Worth, USA

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Publ.-Id: 17772