Scanning transmission electron microscopy-energy dispersive X-ray analysis
line scans and mapping have been used to examine the large-angle grain-boun
dary chemistry of nickel-rich Ni3Al both with and without boron. The result
s suggest that the aluminium content is reduced while the nickel content is
unchanged at the grain boundaries in all these alloys, with the percentage
of reduction in aluminium at the grain boundaries decreasing as the boron
concentration increases. There is a strong likelihood that radiation damage
is influencing or controlling the measured profiles.