Energy-loss near-edge fine structure and compositional profiles of cryomilled oxide-dispersion-strengthened aluminum.
Spatially resolved electron energy-loss spectroscopy (SREELS) makes possible the identification of small second-phase particles in an oxide-dispersion-strengthened aluminum alloy produced by mechanical alloying in a liquid-nitrogen slurry. Near-edge fine structure profiles based on aluminum L23 features that are characteristic of Al-Al or Al-O bonding yield the metal/oxide fraction as a function of probe position. Profiles of nitrogen fraction are derived from linear sequences of spectra so that detection limits can be analyzed at each point in a scan. Quantitative analysis of these linear profiles shows that particles with diameters in the range 10 to 30 nm are rich in nitrogen. A combination of statistical analysis of background removal results with visual inspection of derivative spectra is used to estimate detection limits.
Disko
M M
MM
Exxon Research and Engineering Co., Annandale, NJ 08801.
Luton
M J
MJ
Shuman
H
H
D000535:Aluminum / Q000737:chemistry*; D008863:Microspheres; D009584:Nitrogen / Q000032:analysis; D010100:Oxygen / Q000032:analysis; D013057:Spectrum Analysis / Q000379:methods*
D000535:Aluminum; D009584:Nitrogen; D010100:Oxygen