Mechanical spectroscopy study of the Cu36Zr59Al5 and Cu54Zr40Al6 amorphous alloys

• Autor(a) principal: Marques,Paulo Wilmar Barbosa
• Data de Publicação: 2012
• Outros Autores: Chaves,Javier Muñoz, Silva Jr.,Paulo Sérgio da, Florêncio,Odila, Garcia,Maira Martins, Aliaga,Luis César Rodríguez, Botta,Walter José
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Materials research (São Carlos. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000600035
• topic: bulk metallic glasses; amorphous alloys; glass transition temperature; mechanical spectroscopy; internal friction; anelastic relaxation

A mechanical spectroscopy study of Cu-Zr-Al bulk metallic glasses, was performed with two types of equipment: a Kê-type inverted torsion pendulum and an acoustic elastometer, working in the frequency ranges of Hz and kHz, respectively, with a heating rate of 1 K/min. The analysis of the anelastic relaxation shows similar spectra for both types of equipment resulting in internal friction patterns that vary with temperature and are not reproducible at each thermal cycle. The normalized of the square of the frequency changes from the first to later measurement cycles. These results indicate that the specimens of Cu-Zr-Al alloys were changing by mechanical relaxation, owing to the motion of atoms or clusters in the glassy state and possible "defects" produced during the processing of alloys.