Low energy ion bombardment enhanced diffusion, segregation, and phase transformations in Cu:In alloys

Autor: L. Rivaud, A. H. Eltoukhy, J. E. Greene
Rok vydání: 1982
Předmět:
Zdroj: Radiation Effects. 61:83-92
ISSN: 0033-7579
DOI: 10.1080/00337578208225736
Popis: Scanning transmission electron microscopy and Auger electron spectroscopy were used to investigate the effects of low energy (200–3000 eV) Ar+ ion bombardment of supersaturated Cu: In alloys. Ion bombardment always resulted in the preferential sputtering of In although for sample temperatures T8 ≳ 250°C, In loss due to preferential sputtering was increasingly compensated by radiation enhanced surface segregation. Even at room temperature, however, the steady state In concentration in the altered layer during irradiation, while reduced, remained supersaturated and enhanced diffusion to ion bombardment-created point defect sinks resulted in the volume precipitation of randomly dispersed In-rich δ phase (∼30 at% In) particles in the near-surface region. Thermally induced precipitates, on the other hand, nucleated only at grain boundaries and were only observed at T8 ≥ 250°C. The average size and number density of radiation-induced precipitates increased with increasing ion bombardment energy Ei. Upo...
Databáze: OpenAIRE
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