Microstructural transitions in Pt-C alloys during high-voltage-electron-microscope irradiation

摘要: Abstract Radiation-induced microstructural changes in Pt-C alloys under irradiation inside a high-voltage electron microscope were investigated as function of energy and temperature. Electrons > 380 keV can displace C atoms from the monolayer carbon platelets previously created by co-precipitation vacancies on {100} planes. The collapsed vacant sites left behind this direct displacement process amalgamate after certain incubation dose. At higher energies, 560 keV, electrons impart considerable to atoms, which, turn, become sufficiently energetic Pt via secondary C-Pt collisions. Consequently, these regimes, significant alloy microstructure, such stimulated precipitate coarsening formation interstitial loops matrix, take place, even though incident have energies far below threshold matrix element ( ~ 1.3 MeV). doses for visible defect clusters precipitates measured fitted simple analytical formalisms. present work indicates importance accounting secondary-collision processes assessment radiation damage which alloying elements are drastically different atomic mass.