Devitrification of Al-Y-Ni Glasses

Journal Article · Thu Apr 10 04:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2918112· OSTI ID:21137056

Vasiliev, A L ^[1]; Aindow, M ^[2]

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1. Institute of Crystallography Russian Academy of Sciences, Leninskij pr., 59, Moscow (Russian Federation)
2. Institute of Materials Science, University of Connecticut, Storrs, CT 06269-3136 (United States)

Crystallization of gas-atomized Al-4.3Y-3.8Ni alloy powder during consolidation has been studied ex-situ in a transmission electron microscope using high-resolution lattice imaging together with the image simulations, selected-area diffraction and energy-dispersive X-ray spectrometry experiments. The as-atomized powder is predominantly amorphous but some particles others show evidence of decomposition. On the application of heat and pressure two types of decomposition product are formed initially; equiaxed nanoscale {alpha}-Al grains embedded in an amorphous matrix, and dendritic aluminum grains containing complex ordered structures. The ordered structures in the {alpha}-Al were identified as Guinier-Preston like zones: thin sheets of solute rich material parallel to {l_brace}100{r_brace} and {l_brace}110{r_brace} aluminum planes with ordered cubic symmetry. Amorphous and micro-crystalline phases are in between the aluminum-rich regions. The second and third stages of crystallization involve the conversion of these ordered phases and embryonic precipitates to the better-known binary and ternary compounds.

• OSTI ID: 21137056
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 999; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
CALORIMETRY
CRYSTALLIZATION
DECOMPOSITION
DENDRITES
INTERMETALLIC COMPOUNDS
NANOSTRUCTURES
NICKEL
PARTICLES
POWDERS
RESOLUTION
SOLUTES
TRANSMISSION ELECTRON MICROSCOPY
VITRIFICATION
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
YTTRIUM