Structural relaxation dynamics of Fe83B17and Al88.5Y6.5Ni5amorphous alloys①
(1. Metallic Materials Inspection Center, Guangdong Import and Export Commodity Inspection Bureau,
Guangzhou 510075, P.R.China;
2. Nonequilibrium Materials Research Institute, Central South University of Technology,
Changsha 410083, P.R.China)
Guangzhou 510075, P.R.China;
2. Nonequilibrium Materials Research Institute, Central South University of Technology,
Changsha 410083, P.R.China)
Abstract: According to a new bifurcation theory model for the glass transition proposed by the authors, the experimental non-Debye relaxation law of the structural relaxation of metallic glasses below the glass transition temperatureTg, i.e.(t)~exp[-(t/τ)β], 0<β<1, is theoretically deduced, then, changes of internal friction of Fe83B17and Al88.5Y6.5Ni5amorphous alloys isothermally annealed at various temperatures below their glass transition temperatures were mea-
sured and the structural relaxation dynamics was experimentally studied. It is shown that the structural relaxation dynamics in terms of the internal friction accords with non-Debye law and the experimental result agrees well with the theoretical analysis.
sured and the structural relaxation dynamics was experimentally studied. It is shown that the structural relaxation dynamics in terms of the internal friction accords with non-Debye law and the experimental result agrees well with the theoretical analysis.
Key words: amorphous alloys; structural relaxation; dynamics