Strain Properties of Multicomponent Nanosize Film Materials

Abstract

The results of the correlation between the longitudinal strain coefficient (SC) and the values of the Poisson coefficient and Grüneisen parameter for nanosize film multicomponent alloys (d ≅ 30–50 nm, ci ≅ 11–20 at%) are presented. It is established that in the region of elastic or quasi-elastic deformation (less than or equal to 0.4%), the value of SC is insensitive to changes in the Grüneisen parameter in the range of 1.5–2.5 units during the transition to plastic formation (more than 0.4%). The value of SC decreases from 4–5 units to 3–1 units. Similarly, SC is insensitive to changes in the Poisson coefficient less than or equal 0.4 but decreases sharply in the region of plastic deformation. It is concluded that a sensitive element based on a multicomponent nanoscale film of a solid solution, including a high-entropy one, has advantages over others due to phase stability in a wide temperature range. These materials may be used to develop the architecture of sensitive elements of sensors for various functional purposes.

The Concentration Dependences of Lattice Parameters and Debye Temperature in Multicomponent Solid Solutions

“…are collective properties of multicomponent materials. In this regard, in the case of electrophysical properties (resistivity, thermal resistance coefficient, strain coefficient [5] or melting point [7,10]) the additivity principle can be used only approximately. As a measure of the quantitative characteristics of the influence of the concentration of the doping element on the lattice parameter and the Debye temperature, we determined the integral and differential concentration coefficients.…”

“…In many works (see, for example, Ref. [5] and references cited therein), the concept (principle) of the additivity of physical quantities in multicomponent single-phase solid solutions (s.s.), including high-entropy alloys (HEA), is used. The essence of the additivity principle is that the average value of the physical quantity A for s.s. can be calculated according to the ratio:…”

“…( 4) will be the approximation only, and, it can be extended to the cases of the thermal-resistance coefficient . Taking into account this one, we calculated the concentration dependence of the lattice parameter and the Debye temperature [5]. Based on these data, their concentration coefficients were calculated for 4-6-components' s.s. that was the goal of this work.…”

On the Possibility of Applying the Principle of Physical Quantities Additivity of Multicomponent Metallic Materials

“…In previous works [1][2][3], we made an attempt to predict some physical quantities of multicomponent materials in the form of solid solutions (s.s), including and high-entropy (HEA). The methodological basis of such a forecast is the concept (principle) of additivity of physical quantities.…”

“…• 𝜀 𝑑𝑖 , (1) where 𝜀 𝑑 ̅̅̅ is the average value of the energy level of dorbital; 𝑐 𝑖 − the atomic fraction of component i in the alloy; 𝜀 𝑑𝑖 − the d-orbital energy level of element i [4];…”