Studies on the mechanism of the structural evolution in Cu–Al–Ni elemental powder mixture during high energy ball milling

The present work is focused on the understanding of the phase and microstructural evolution during mechanical alloying of 82Cu–14Al–4Ni powder mixture. Morphology and phase evolution in the milled powder at different stages of milling were studied and a physical modeling of the mechanical alloying h...

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Bibliographic Details
Published in:Journal of materials science 2009-08, Vol.44 (16), p.4334-4341
Main Authors: Vajpai, S. K., Dube, R. K., Sharma, M.
Format: Article
Language:English
Subjects:
Aggregates
ALLOYING
Aluminum
Ball milling
BALL MILLS
Characterization and Evaluation of Materials
Classical Mechanics
Cold welding
Copper
COPPER ALLOYS (40 TO 99.3 CU)
COPPER ALUMINUM ALLOYS
Copper base alloys
Crystallography and Scattering Methods
DEFORMATION
Deformation mechanisms
Elongation
Evolution
Fragmentation
Grain refinement
Heat treating
Materials Science
Mechanical alloying
Microstructure
MICROSTRUCTURES
MILLING
Morphology
Nickel
Plastic deformation
Polymer Sciences
POWDERS
REFINING
Rolling mills
Solid Mechanics
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Summary:The present work is focused on the understanding of the phase and microstructural evolution during mechanical alloying of 82Cu–14Al–4Ni powder mixture. Morphology and phase evolution in the milled powder at different stages of milling were studied and a physical modeling of the mechanical alloying has been proposed. It has been demonstrated that milling process mainly consisted of four stages, i.e., flattening and cold welding of powder particles to form a porous aggregate followed by its fragmentation, plastic deformation of small aggregates to form layered particles, severe plastic deformation of layered particles to form elongated flaky particles, and fragmentation of elongated particles into smaller size flaky powder particles. It was also found that the initial period of milling resulted in rapid grain refining, whereas alloying was accomplished during the later period of milling. TEM study of the 48 h milled powder revealed that the microstructure was equiaxed nanocrystalline in nature. It was found that the grains were either randomly distributed or arranged as banded type. A possible explanation for such a behavior has been presented.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-009-3646-x