Mechanical spectroscopy study of the Cu36Zr59Al5 and Cu54Zr40Al6 amorphous alloys

Materials Research

Paulo Wilmar Barbosa Marques¹  Javier Muñoz Chaves¹  Paulo Sérgio Da Silva Jr.¹  Odila Florêncio¹  Maira Martins Garcia¹  Luis César Rodríguez Aliaga²  Walter José Botta² 

[1] ,Federal University of São Carlos Department of Physics São Carlos SP ,Brazil

关键词: bulk metallic glasses;    amorphous alloys;    glass transition temperature;    mechanical spectroscopy;    internal friction;    anelastic relaxation;   

DOI  :  10.1590/S1516-14392012005000138

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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