High resolution electron microscopic study of the ordering processes in Ni/sub 4/Mo alloy

Journal Article · Tue Mar 01 04:00:00 EST 1988 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(88)90098-3· OSTI ID:6896439

Lee, K H; Hiraga, K; Shindo, D; Hirabayashi, M

The authors studied the ordering processes using the many-beam imaging technique with the aid of an image processing method. No microdomains was detected in high resolution electron micrographs of the alloy quenched from 1000/sup 0/C, but lattice modulations which should probably be attributed to concentration waves appear parallel to the /210/ planes at the initial ordering stage. The observed contrasts of D1/sub a/-type and D0/sub 22/-type microdomains are apparently formed with superpositions of different pairs of the /210/ lattice modulations. When the alloy is annealed at 650/sup 0/C for 192h, Ni/sub 2/Mo domains appear in between the Ni/sub 4/Mo domains. Their composition is determined to be the stoichiometry (32at%Mo) by energy dispersive X-ray (EDX) analysis. The superstructure images of Ni/sub 4/Mo and Ni/sub 2/MO are discussed in comparison with computer simulations by the multislice method.

• Research Organization: Institute for Materials Research (Formerly the Research Institute for Iron, Steel and Other Metals), Tohoku Univ., Sendai 980 (JP)
• OSTI ID: 6896439
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 36:3; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ANNEALING
CHEMICAL COMPOSITION
CHEMISTRY
COHERENT SCATTERING
COMPUTERIZED SIMULATION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
DOMAIN STRUCTURE
ELECTRON MICROSCOPY
HEAT TREATMENTS
HIGH TEMPERATURE
HOT ATOM CHEMISTRY
IMAGE PROCESSING
MICROSCOPY
MOLYBDENUM ALLOYS
NICKEL ALLOYS
ORDER PARAMETERS
PROCESSING
QUENCHING
RADIOCHEMISTRY
SCATTERING
SIMULATION
STOICHIOMETRY
SUPERLATTICES
X-RAY DIFFRACTION