Caracterização mecanico-metalurgica de compositos A1-Nbc, produzidos por metalurgia do po

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

The work deals with the metalIurgicaland mechanical characterization of composites Al-NbC containing 5, 10 and 15% vol of NbC particles, in the extruded condition. Composites were produced from Al 1100 and NbC powders (average powder diameter 25 and 2,3 um, respectively), and subsequently extruded to bars. MetalIurgical characterization involved the analysis of the stability of reinforcement particles and their macroscopic distribution within the matrix as welI as the analysis of particles/matrix interface by MEY. Results showed that fracture can occurs in the particles of NbC at some extent; no interface reactions and changes in particles dimensions were observed. Homogeneous macroscopic distribution of NbC particles was obtained in all cases; therefore, microscopically it could be observed agglomeration of NbC as its vol fraction increases. It was also characterized thermal expansion and apparent density. Results showed decrease in the coefficient of linear thermal expansion in the order of 17 to 26% related to Al alone, as NbC content increases from 5 to 15% vol, respectively; and an increase of 15 to 20% in apparent density, for the same conditions...Note: The complete abstract is available with the full electronic digital thesis or dissertations

ASSUNTO(S)

desgaste mecanico carbonetos metalurgia do po compostos de aluminio aluminio compostos metalicos propriedades mecanicas

ACESSO AO ARTIGO

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