Mechanical spectroscopy study on the Cu54Zr40Al6 amorphous matrix alloy at low temperature

Autor(es)

Marques, P. W. B. ^[1] ; Chaves, J. M. ^[1] ; Silva, Jr., P. S. ^[1] ; Florencio, O. ^[1] ; Moreno-Gobbi, A. ^[2] ; Aliaga, L. C. R. ^[3] ; Botta, W. J. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Fis, BR-676 Sao Carlos, SP - Brazil

^[2] Fac Ciencias UDELAR, Inst Fis, Montevideo 11400 - Uruguay

^[3] Univ Fed Sao Carlos, Dept Mat Engn, BR-676 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 621, p. 319-323, FEB 5 2015.
• Citações Web of Science: 5

Resumo

A mechanical spectroscopy study of Cu54Zr40Al6 bulk metallic glasses composites was carried out in the kHz and MHz frequency ranges, by means of flexural and ultrasonic methods, respectively, in the temperature interval 150-300 K. In internal friction and attenuation curves at low temperature were observed peaks which were associated with distortions in the configuration of atomic clusters, which absorbed different quantities of energy due to short and medium order rearrangements. Changes within the clusters or atomic jumps between clusters occurring in the specimen induced the onset of polyamorphic peaks, since electronic interactions and bonding changed abruptly. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/13378-1 - Relaxações Anelásticas na Identificação de Processos de Migração Atômica e Rearranjo Estrutural em Ligas Metálicas com Alta Tendência à Formação de Vidro (Ligas Vítreas e Nanocristalinas)
• Beneficiário: Paulo Wilmar Barbosa Marques
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado