Abstract
Segregation of surprising magnitude and depth was discovered in oxygen plasma-implanted Mg-containing Al alloys. In order to identify the respective roles of diffusional kinetics and oxidation energetics in the effect, pure Al and an Al–Mg–Zn–Cu–Cr alloy were implanted for various times, or oxidized in air, at 700 K. Examination of depth profiles and chemical states of O, Al, and Mg by x-ray photoelectron spectroscopy reveals a potent synergy between the chemical potential drive and the radiation-enhanced diffusion.
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