Regular Article

Pressure effects on thermo-mechanical properties of intermetallic B2-type FeAl alloy

¹ Institute of Research and Development, Duy Tan University, 03 Quang Trung, Hai Chau, Da Nang 550900, Viet Nam
² Tan Trao University, Km 6, Yen Son, Tuyen Quang 301910, Viet Nam
³ Hong Duc University, 565 Quang Trung, Dong Ve, Thanh Hoa 441430, Viet Nam
⁴ Laboratory of Advanced Materials Chemistry, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City 758307, Viet Nam
⁵ Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 758307, Viet Nam

^a e-mail: tranthiha@tdtu.edu.vn

Received: 2 October 2019
Received in final form: 21 November 2019
Published online: 20 January 2020

Abstract

The pressure effects on thermo-mechanical properties of B2-type FeAl compound have been investigated based on the moment method in statistical mechanics. We derive analytical expressions of equation-of-state, isothermal bulk modulus and specific heats at constant volume and constant pressure of B2-type iron aluminide intermetallic compound. Numerical calculations for lattice parameter, isothermal bulk modulus, Young’s modulus, shear modulus and specific heat at constant pressure of B2-type Fe-40 at.% Al have been performed up to pressure of 10 GPa. Our research shows that the elastic moduli are linear proportional to pressure and the specific heat at constant pressure diminishes strongly at temperature below 300 K. The present statistical moment method results are compared with available experimental data as well as ab initio calculations when possible to verify the developed theory. This research proposes the potential of the moment method in the investigation of thermo-mechanical properties of materials under pressure.