Program

P.16 -- Poster, NCTP-42

Date: Tuesday, 1 August 2017

Time: 16h00 - 17h30

Thermodynamic property of interstitial alloy FeCrSi with vacancy and BCC structure: Dependence on temperature, concentration of substitution atoms, concentration of interstitial atoms and concentration of equilibrium vacancies

Nguyen Quang Hoc (1), Pham Thi Minh Hanh (2), Nguyen Ngoc Lan Anh(1) and Le Hong Viet (3)

Trường Đại Học Sư Phạm Hà Nội 2

The analytic expressions for the concentration of equilibrium vacancies and the thermodynamic quantities such as the mean nearest neighbor distance, the free energy, the isothermal and adiabatic compressibilities, the isothermal and adiabatic elastic moduli, the thermal expansion coefficient, the heat capacities at constant volume and at constant pressure, the entropy of binary interstitial alloy with defect and with body-centered cubic (BCC) structure with the concentration of interstitial atoms is small (below 5%) are derived by the statistical moment method. The obtained expressions of these quantities depend on temperature, concentration of substitution atoms, concentration of interstitial atoms and concentration of equilibrium vacancies. The theoretical results are applied to interstitial alloy FeCrSi in the interval of temperature from 600 to 1000K, in the interval of substitution atom concentration from 0 to 10% and in the interval of interstitial atom concentration from 0 to 5%. In special cases, we obtain the thermodynamic quantities of substitution alloy FeCr, interstitial alloy FeSi and main metal Fe with defect. Our calculated results for the thermal expansion coefficient and the heat capacity under constant pressure of main metal Fe are in good agreement with experiments. Our results show that the concentration of equilibrium vacancies affect thermodynamic property of interstitial alloy in high temperatures. Keywods: interstitial alloy, substitution alloy, statistical moment method, substitution and interstitial atoms, concentration of equilibrium vacancies.

Presenter: Lê Hồng Việt