Characterization of copper-cementite nanocomposite produced by mechanical alloying
- Instituto Superior Tecnico, Engenharia de Materiais, Av. Rovisco Pais, 1049-001 Lisbon (Portugal)
- INETI-DMTP, Estrada do Paco do Lumiar, 1649-038 Lisbon (Portugal)
A copper-iron carbide nanocomposite has been synthesized by high-energy milling of elemental powders (Cu{sub 69}-Fe{sub 23}-C{sub 8}), followed by annealing at 873 K. Phase identification and microstructure characterization have been carried out by transmission electron microscopy and energy dispersive spectroscopy. The carbide phase found in the as-milled material has been identified as Fe{sub 3}C and/or Fe{sub 7}C{sub 3}, but clearly only Fe{sub 3}C was present after annealing. Overall, grain sizes ranged from 10 to 50 nm in the as-milled condition and from 30 to 160 nm after annealing, with the carbide phase presenting a higher growth rate than copper. Stacking faults and a dispersion of Cu nanoparticles (5-10 nm) have been detected in annealed cementite while copper grains exhibited twins on (1 1 1) planes. Cementite growth could be evaluated in terms of precipitate growth theory. The remarkable thermal stability of the copper matrix is proposed to be related to solute drag effects.
- OSTI ID:
- 20637151
- Journal Information:
- Acta Materialia, Vol. 53, Issue 4; Other Information: DOI: 10.1016/j.actamat.2004.10.042; PII: S1359-6454(04)00665-2; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
Similar Records
Microstructural evolution of Fe{sub 3}B/Nd{sub 2}Fe{sub 14}B nanocomposite magnets microalloyed with Cu and Nb
Effect of heat treatment on microstructure and interface of SiC particle reinforced 2124 Al matrix composite