Solid state reactions between Ni and Al powders induced by plastic deformation
- Centro Ricerche Energia Casaccia, Roma (Italy). Division Scienza dei Materiali
The solid state reactions induced by high-energy ball milling of Al/Ni elemental mixtures at 25, 33, 50, 67, and 75 Ni at.% have been studied by X-ray diffraction and electron microscopy. The thermal stability of the reaction products at different stages of milling has been investigated by differential scanning calorimetry. The sequence of reactions observed in each sample depends even in its early steps on the initial composition of the mixture. The end-product of the milling process is, in some cases, a metastable phase. For long milling times, in fact, the authors have observed the formation of a metastable f.c.c. solid solution at the two Ni-rich compositions, of the AlNi phase at 50 and 33% Ni and of the Al[sub 3]Ni compound at 25% Ni. Thermal treatment of samples at an early stage of milling shows, contrary to the behavior induced by plastic deformation, that at all compositions the first thermally driven reaction is the formation of Al[sub 3]Ni. The experimental observations of an enhancement of Ni diffusivity in Al during ball milling, suggests that this high diffusivity is the main cause of the observed differences.
- OSTI ID:
- 7029676
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:7; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
DATA
DIFFUSION
EXPERIMENTAL DATA
HEAT TREATMENTS
INFORMATION
INTERMETALLIC COMPOUNDS
MACHINING
MICROSTRUCTURE
MILLING
MORPHOLOGICAL CHANGES
NICKEL ALLOYS
NUMERICAL DATA
PHASE STUDIES