Quenched-in excess volume and structural relaxation in Ni- and FeNi based metallic glasses
1986; Elsevier BV; Volume: 85; Issue: 3 Linguagem: Inglês
10.1016/0022-3093(86)90008-6
ISSN1873-4812
AutoresTakayuki Komatsu, Kazumasa Matusita, Ryosuke Yokota,
Tópico(s)Glass properties and applications
ResumoAbstract The amount of quenched-in excess volume ( ΔV R ) in various Ni- and FeNi based metallic glasses, which is defined by the volume change due to the structural relaxation, was estimated from measurements of length changes caused by isochronal annealing. It was found that the values of ΔV R depend greatly on the kind of transition metals (Fe, Ni) and metalloids (Si, B, P) and their ratios (Fe/Ni, Si/B). In non-magnetic Ni-based metallic glasses, almost a linear relationship was observed between the changes in volume and electrical resistivity during the low temperature annealing below around 275°C. Furthermore, a large ΔV R was observed in the metallic glasses which have a large thermal expansion coefficient such as Ni 75 Si 12.5 B 12.5 or which exhibit a well-defined glass transition such as Fe 27 Ni 53 P 14 B 6 , as a general trend. These results indicate that the amount of quenched-in excess volume is very sensitive to the local atomic arrangement and is attributed mainly to the distribution in bond lengths, angles and coordination numbers in the short range structure and the difference in packing of basic structural units between as-quenched and relaxed glassy states.
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