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Time-Dependent Evolution of Al-Al4C3 Composite Microstructure and Hardness during the Sintering Process.
Santos Beltrán, Audel; Gallegos Orozco, Verónica; Santos Beltrán, Miriam; Medrano Prieto, Hansel; Estrada Guel, Ivanovich; Gallegos Orozco, Carmen; Martínez Sánchez, Roberto.
Afiliação
  • Santos Beltrán A; Departamento de Nanotecnología, Universidad Tecnológica de Chihuahua Sur, Km. 3.5 Carr. Chihuahua a Aldama, Chihuahua 31313, Mexico.
  • Gallegos Orozco V; Departamento de Ciencias Básicas, Tecnológico Nacional de México, Campus Chihuahua, Ave. Tecnológico 2909, Chihuahua 31310, Mexico.
  • Santos Beltrán M; Departamento de Ciencias Básicas, Tecnológico Nacional de México, Campus Chihuahua, Ave. Tecnológico 2909, Chihuahua 31310, Mexico.
  • Medrano Prieto H; Departamento de Nanotecnología, Universidad Tecnológica de Chihuahua Sur, Km. 3.5 Carr. Chihuahua a Aldama, Chihuahua 31313, Mexico.
  • Estrada Guel I; Departamento de Nanotecnología, Universidad Tecnológica de Chihuahua Sur, Km. 3.5 Carr. Chihuahua a Aldama, Chihuahua 31313, Mexico.
  • Gallegos Orozco C; Centro de Investigación en Materiales Avanzados (CIMAV), Laboratorio Nacional de Nanotecnología, Miguel de Cervantes No. 120, Chihuahua 31136, Mexico.
  • Martínez Sánchez R; Departamento de Económico Administrativo, Tecnológico Nacional de México, Campus Chihuahua II, Ave. de las Industrias #11101, Complejo Industrial Chihuahua, Chihuahua 31130, Mexico.
Materials (Basel) ; 17(19)2024 Sep 30.
Article em En | MEDLINE | ID: mdl-39410389
ABSTRACT
In this study, Al-Al4C3 compounds were manufactured by mechanical milling followed by heat treatment. To analyze the microstructural evolution, the composites were sintered at 550 °C at different sintering times of 2, 4 and 6 h. The mechanical results suggest that dislocation density and crystallite size primarily contribute to hardening before the sintering process, with a minimal contribution from particle dispersion in this condition. The compound exhibited a significant 75% increase in hardness after 2 h of sintering, primarily attributed to the nucleation and growth of Al4C3 nanorods. The HRTEM analysis, combined with geometric phase analysis (GPA) at and near the Al-Al4C3 interface of the nanorods, revealed strain field distributions primarily associated with partial screw dislocations and the presence of closely spaced dislocation dipoles. These findings are consistent with the microstructural parameters determined from X-ray diffraction pattern analysis using the convolutional multiple whole profile (CMWP) method. This analysis showed that the predominant dislocation character is primarily of the screw type, with the dislocation dipoles being closely correlated. Based on these results, it is suggested that samples with a lower weight percentage of reinforcement and longer sintering times may experience reduced brittleness in Al/Al4C3 composites. Strengthening contributions were calculated using the Langford-Cohen and Taylor equations.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Materials (Basel) Ano de publicação: 2024 Tipo de documento: Article País de afiliação: México País de publicação: Suíça

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Materials (Basel) Ano de publicação: 2024 Tipo de documento: Article País de afiliação: México País de publicação: Suíça