Article

Mechanical relaxations of a (Zr77.5Ti22.5)55(Ni48Cu52)21.25Be23.75 amorphous alloy studied using dynamic mechanical analysis

Metals and Materials International (impact factor: 1.18). 05/2012; 13(6):447-453. DOI:10.3365/Met.Mat.2007.12.447

ABSTRACT The dynamic mechanical properties of a (Zr77.5Ti22.5)55(Ni48Cu52)21.25Be23.75 amorphous alloy were investigated by frequency-dependent elastic moduli and isothermal multi-frequency measurements. The
frequency-dependent loss modulus showed a relaxation behavior resulting from a glass transition, and the variation of the
peak frequency was related to the Arrhenius equation. Isothermal multi-frequency measurement data were used to construct the
master curves of the elastic moduli and tan δ by applying the time-temperature superposition principle. The temperature dependence
of the shift factor was found to follow the Arrhenius relationship, and the activation energies for the low temperature relaxation
and glass transition were approximately 156.6kJ/mol and 554kJ/mol, respectively. The glass transition temperature (T
g) was manifested by the crossover region of the shift factor dependence, and from the relationship between the shift factors
and the temperature aboveT
g), the fragility index of this alloy was estimated.

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Keywords

alloy
 
Arrhenius equation
 
Arrhenius relationship
 
crossover region
 
dynamic mechanical properties
 
elastic moduli
 
frequency-dependent elastic moduli
 
frequency-dependent loss modulus
 
glass transition
 
glass transition temperature
 
Isothermal multi-frequency measurement data
 
isothermal multi-frequency measurements
 
low temperature relaxation
 
master curves
 
peak frequency
 
shift factor dependence
 
shift factors
 
tan δ
 
temperature dependence
 
time-temperature superposition principle
 

H. T. Jeong