Cryogenic and Room Temperature ECAP Consolidation of Blended Elemental Powders of Aluminum and Copper

Cryogenic and Room Temperature ECAP Consolidation of Blended Elemental Powders of Aluminum and Copper

The effect of temperature was investigated on the consolidation of blended elemental powders of aluminum and copper by equal channel angular pressing (ECAP). Aluminum and Copper powders (1:1% vol.) were blended and consolidated in a 90° ECAP die at room (RT) and cryogenic temperatures (CT - ~77 K)....

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Bibliographic Details
Published in:Materials research (São Carlos, São Paulo, Brazil) Vol. 25; p. 1
Main Authors: Namur, Ricardo Sanson, Azevedo, Maxwell Silva, Izumi, Marcel Tadashi, Aguiar, Denilson Jose Marcolino de, Zilnyk, Kahl Dick, Cintho, Osvaldo Mitsuyuki
Format: Journal Article
Language:English
Published: Sao Carlos Universidade Federal do Sao Carlos, Departamento de Engenharia de Materiais 01-01-2022
ABM, ABC, ABPol
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
Subjects:
Aluminum
Chemical composition
Consolidation
Copper
Cryogenic deformation
Cryogenic properties
Cryogenic temperature
Deformation mechanisms
deformation processed metal-metal composite
ENGINEERING, CHEMICAL
Equal channel angular pressing
Hardness
Homology
Low temperature
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
Microstrain
powder consolidation
Room temperature
Stacking faults
Strain hardening
Temperature
Temperature effects
Tensile tests
powder consolidation
equal channel angular pressing
Cryogenic deformation
deformation processed metal-metal composite
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Summary:The effect of temperature was investigated on the consolidation of blended elemental powders of aluminum and copper by equal channel angular pressing (ECAP). Aluminum and Copper powders (1:1% vol.) were blended and consolidated in a 90° ECAP die at room (RT) and cryogenic temperatures (CT - ~77 K). ECAP samples were pressed until 4 passes at room temperature in route Bc. As a reference, a sample was obtained by conventional uniaxial pressing. The obtained results indicated a much denser (>99.5%) and harder structure by cryogenic ECAP. The hardness after one pass at CT was comparable with 4 passes at room temperature. Tensile tests performed at CT for materials with similar chemical composition showed a simultaneous increase in strength and ductility at CT, corroborating the results obtained by ECAP. The partial suppression of dynamic recovery and the activation and the transition between deformation mechanisms at CT, as well as stacking fault energies (SFE) of such metals, played an important role in these results. Copper presented a much higher capability of strain hardening than aluminum, due to its lower SFE and much lower homologous temperature. X-ray diffraction indicated a strong correlation between the variation of average microstrain and the variation of hardness on both metals. The results of this study demonstrated the great potential of the application of very low temperatures for the obtaining of deformation metal-metal composites.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-mr-2021-0414