Abstract

Microstructural changes in Ni-C and Pt-C alloys under irradiation inside a high-voltage electron microscope were investigated as a function of energy and temperature. Two main aspects of microstructural damage by electron irradiation at energies below the displacement threshold of the host elements are discussed: direct displacement of light C solutes by the incident electrons and indirect displacement of heavy Ni and Pt atoms by secondary C-solvent atom collisions. The present study provides new insights into the mechanisms that lead to the formation of defect aggregates in interstitial alloys during sub-threshold energy irradiation. 5 figures.

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