Evaluation of the elastic properties of bulk metallic glasses

Abstract

The development of bulk metallic glasses as a prominent class of functional and structural materials has attracted considerable interest in the last years. One of the fundamental physical quantities necessary to describe the mechanical properties of the materials is the bulk modulus. In the present article, a simple method to estimate the bulk modulus and its pressure derivative is proposed. It is shown that these quantities can be estimated from the values of the constituent elements and their compositions. Comparison with measured data shows good agreement. The physical background of the method is discussed based on the jellium model of metals.

Elastic Constants, Equation of State and Mechanical Relaxations of some Metallic Glasses at High Pressure

“…2. The calculation for the pressure derivative of the bulk modulus indicates that dB/dP ≈ 5 [10]. This value is close to the value reported for elemental metals.…”

“…1 indicates that the estimation is good. The result indicates also that the mechanical properties of bulk metallic glasses are determined essentially by the electron density analogously to the case of elementary metals [10]. The physical background of the estimation has been discussed based on the jellium model of metals that includes the kinetic, exchange and correlation energies of the electronic system [10].…”

“…Therefore, it will be valuable to develop a method to estimate easily the physical quantities. Recently, it has been shown that the bulk modulus and its pressure derivative of bulk metallic glasses can be estimated from the values of the constituent elements and their compositions [9,10]. The result shown in Fig.…”

Pressure dependence of the fragility in metallic glass forming liquids: Predictions from a theoretical model and materials properties correlations

“…The physical background of the estimation has been discussed based on the jellium model of metals that includes the kinetic, exchange and correlation energies of the electronic system. From the study, it was concluded that the mechanical properties of bulk metallic glasses are determined essentially by the electron density analogously to the case of elementary metals [16]. The same picture has been presented in [18].…”

“…One of the fundamental physical quantities necessary to describe the mechanical properties of materials is the bulk modulus. Recently, it has been shown that the bulk modulus and its pressure derivative of bulk metallic glasses can be estimated from the values of the constituent elements and their compositions [16,17]. There it has been shown that the predicted values from the model are in good agreement with the experimental data [17].…”