Reliability of sublattice occupancies determined by ALCHEMI
The atom location by channeling enhanced microanalysis (ALCHEMI) technique is an attractive method for sublattice (site) occupancy determination, especially in multiphase materials. It has been applied to a wide range of ceramics, minerals, semiconductors and metallic alloys with varying degrees of success. The simplicity of the method originally proposed has not always been borne out in practice; applications of the technique have revealed limitations due to crystallography, microstructure, specimen preparation, ionization delocalization, and weak channeling discrimination. Some of these limitations have been encountered in work at ORNL on ALCHEMI of intermetallic alloys such as L1{sub 2{minus}} ordered Ni{sub 3}Al-based alloys (with additions of Hf, Co and Fe) and L1{sub 0{minus}} ordered Cu{sub 50}Au{sub 50-y}(X){sub y} alloys with X = Pd or Ni. These applications have been motivated by the technological importance of ordered intermetallic alloys. Commercial materials often have complex compositions with ternary (or higher) additions present at substantial levels.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5237765
- Report Number(s):
- CONF-920819-18; ON: DE92014592
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
GOLD ALLOYS
INTERMETALLIC COMPOUNDS
MICROANALYSIS
NICKEL ALLOYS
NICKEL BASE ALLOYS
PALLADIUM ALLOYS
PLATINUM METAL ALLOYS
RELIABILITY
SPECTROSCOPY
X-RAY SPECTROSCOPY