中国物理B ›› 2017, Vol. 26 ›› Issue (3): 37102-037102.doi: 10.1088/1674-1056/26/3/037102

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Stability, electronic structures, and mechanical properties of Fe-Mn-Al system from first-principles calculations

Ya-Hui Liu(刘亚会), Xiao-Yu Chong(种晓宇), Ye-Hua Jiang(蒋业华), Jing Feng(冯晶)   

  1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
  • 收稿日期:2016-09-08 修回日期:2016-12-21 出版日期:2017-03-05 发布日期:2017-03-05
  • 通讯作者: Ye-Hua Jiang E-mail:jiangyehua@kmust.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51261013).

Stability, electronic structures, and mechanical properties of Fe-Mn-Al system from first-principles calculations

Ya-Hui Liu(刘亚会), Xiao-Yu Chong(种晓宇), Ye-Hua Jiang(蒋业华), Jing Feng(冯晶)   

  1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
  • Received:2016-09-08 Revised:2016-12-21 Online:2017-03-05 Published:2017-03-05
  • Contact: Ye-Hua Jiang E-mail:jiangyehua@kmust.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51261013).

摘要: The stability, electronic structures, and mechanical properties of the Fe-Mn-Al system were determined by first-principles calculations. The formation enthalpy and cohesive energy of these Fe-Mn-Al alloys are negative and show that the alloys are thermodynamically stable. Fe3Al, with the lowest formation enthalpy, is the most stable compound in the Fe-Mn-Al system. The partial density of states, total density of states, and electron density distribution maps of the Fe-Mn-Al alloys were analyzed. The bonding characteristics of these Fe-Mn-Al alloys are mainly combinations of covalent bonding and metallic bonds. The stress-strain method and Voigt-Reuss-Hill approximation were used to calculate the elastic constants and moduli, respectively. Fe2.5Mn0.5Al has the highest bulk modulus, 234.5 GPa. Fe1.5Mn1.5Al has the highest shear modulus and Young's modulus, with values of 98.8 GPa and 259.2 GPa, respectively. These Fe-Mn-Al alloys display disparate anisotropies due to the calculated different shape of the three-dimensional curved surface of the Young's modulus and anisotropic index. Moreover, the anisotropic sound velocities and Debye temperatures of these Fe-Mn-Al alloys were explored.

关键词: density functional theory, electronic structures, mechanical properties, anisotropy

Abstract: The stability, electronic structures, and mechanical properties of the Fe-Mn-Al system were determined by first-principles calculations. The formation enthalpy and cohesive energy of these Fe-Mn-Al alloys are negative and show that the alloys are thermodynamically stable. Fe3Al, with the lowest formation enthalpy, is the most stable compound in the Fe-Mn-Al system. The partial density of states, total density of states, and electron density distribution maps of the Fe-Mn-Al alloys were analyzed. The bonding characteristics of these Fe-Mn-Al alloys are mainly combinations of covalent bonding and metallic bonds. The stress-strain method and Voigt-Reuss-Hill approximation were used to calculate the elastic constants and moduli, respectively. Fe2.5Mn0.5Al has the highest bulk modulus, 234.5 GPa. Fe1.5Mn1.5Al has the highest shear modulus and Young's modulus, with values of 98.8 GPa and 259.2 GPa, respectively. These Fe-Mn-Al alloys display disparate anisotropies due to the calculated different shape of the three-dimensional curved surface of the Young's modulus and anisotropic index. Moreover, the anisotropic sound velocities and Debye temperatures of these Fe-Mn-Al alloys were explored.

Key words: density functional theory, electronic structures, mechanical properties, anisotropy

中图分类号:  (Density functional theory, local density approximation, gradient and other corrections)

  • 71.15.Mb
71.23.-k (Electronic structure of disordered solids) 62.20.-x (Mechanical properties of solids) 75.30.Gw (Magnetic anisotropy)