Properties of Fe-Mn-Al alloys with different Mn contents using density functional theory  

作　　者：Xiang Luo Jing Feng Ya-Hui Liu Ming-Yu Hu Xiao-Yu Chong Ye-Hua Jiang 

机构地区：[1]Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming,650093,China

出　　处：《Rare Metals》2023年第4期1387-1397,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51261013)。

摘　　要：The chemical stability,electronic structures,mechanical properties and Debye temperature of Fe-MnAl alloys were investigated using first-principles calculations.The formation enthalpy and cohesive energy are negative for Fe-Mn-Al alloys,showing that they are thermodynamically stable.FeAl has the lowest formation enthalpy,indicating that FeAl is the most stable alloy in the Fe-Mn-Al system.The partial density of states,total density of states and electron density distribution maps were used to analyze the physical properties of the Fe-MnAl alloys.A combination of mainly covalent and metallic bonds exists in these Fe-Mn-Al alloys,resulting in good electronic conductivity,high melting points,and high hardness.These alloys display disparate anisotropy due to the calculated different shapes of the 3D curved surface of the Young's modulus and anisotropic index.FeAl has the highest bulk modulus,shear modulus and Yong's modulus of 187.1,119.8 and 296.2 GPa,respectively.Further,the Debye temperatures and sound velocity of these Fe-Mn-Al compounds were explored.

关 键 词：Fe-Mn-Al alloys Electronic structures STABILITY Mechanical properties Debye temperature First-principles calculation 

分 类 号：O641.1[理学—物理化学] TG141[理学—化学]