Solid solution evolution during mechanical alloying in Cu-Nb-Al compounds

This work concerns the structural evolution of Cu 70 Nb 20 Al 10 (at%) alloy processed by mechanical alloying using a planetary ball mill in air atmosphere for different times (4 to 200 h). The morphological, structural, micro structural, and thermal behaviors of the alloy were investigated by scann...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2019-09, Vol.26 (9), p.1129-1139
Main Authors: Zaara, Kaouther, Chemingui, Mahmoud, Optasanu, Virgil, Khitouni, Mohamed
Format: Article
Language:English
Subjects:
Alloys
Aluminum compounds
Ball milling
Ball mills
Calorimetry
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium steel
Composites
Copper
Corrosion and Coatings
Crystal structure
Crystallites
Crystallography
Diffraction patterns
Ductility
Engineering Sciences
Glass
Materials
Materials Science
Mechanical alloying
Mechanical properties
Metallic Materials
Microstrain
Morphology
Natural Materials
Niobium
Oxidation
Planetary evolution
Powder metallurgy
Rietveld method
Scanning electron microscopy
Solid solutions
Surfaces and Interfaces
Thin Films
Tribology
X-ray diffraction
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Summary:This work concerns the structural evolution of Cu 70 Nb 20 Al 10 (at%) alloy processed by mechanical alloying using a planetary ball mill in air atmosphere for different times (4 to 200 h). The morphological, structural, micro structural, and thermal behaviors of the alloy were investigated by scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, and differential scanning calorimetry. X-ray diffraction patterns were examined using the Rietveld refinement technique with the help of the MAUD software. A disordered FCC-Cu(Nb,Al) solid solution was formed after 8 h of milling. The crystallite size, microstrain, and lattice parameter were determined by the Rietveld method. With increasing milling time, the crystallite size of the final product—ternary -phase FCC-Cu(Nb,Al)—is refined to the nanometer scale, reaching 12 nm after 200 h. This crystallographic structure combines good mechanical strength and good ductility. An increase in microstrain and partial oxidation were also observed with increasing milling time.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-019-1820-y