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First-principles study on mechanical properties and electronic structures of Ti–Al intermetallic compounds

Published online by Cambridge University Press:  04 February 2019

Wenjun Huang Open the ORCID record for Wenjun Huang [Opens in a new window] ,
Fenjun Liu ,
Jianbo Liu  and
Yaofei Tuo
Wenjun Huang*
Affiliation:
College of Energy Engineering, Yulin University, Yulin, Shaanxi Province 719000, People’s Republic of China
Fenjun Liu
Affiliation:
College of Energy Engineering, Yulin University, Yulin, Shaanxi Province 719000, People’s Republic of China; State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi Province 710072, People’s Republic of China
Jianbo Liu
Affiliation:
College of Energy Engineering, Yulin University, Yulin, Shaanxi Province 719000, People’s Republic of China; School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, Shaanxi Province 710048, People’s Republic of China
Yaofei Tuo
Affiliation:
College of Energy Engineering, Yulin University, Yulin, Shaanxi Province 719000, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: xiaohuang20180909@163.com
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Abstract

In this study, we investigated the elastic constants, moduli, hardness, and electronic structures of Ti–Al intermetallic compounds (TiAl, Ti3Al, and TiAl3) using first-principles calculations. The cohesive energy and formation enthalpy of these compounds are negative, which indicates that they are thermodynamically stable. We calculated the elastic constants and moduli using the stress–strain method and Voigt–Reuss–Hill approximation, respectively. We evaluated the mechanical anisotropy of these compounds using the anisotropic index and found that the results are in good agreement with other experimental and theoretical data. We evaluated the chemical bonding of these compounds by calculating their density of states, the results of which revealed that the bonding behavior of all Ti–Al intermetallic compounds involved a mixture of metallic and covalent bonds. We also estimated the Debye temperature and sound velocities of these Ti–Al intermetallic compounds.

Keywords

mechanical propertiesanisotropyelectronic structurefirst-principles calculationsstability
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 7: Focus Section: Interconnects and Interfaces in Energy Conversion Materials , 15 April 2019 , pp. 1112 - 1120
Copyright
Copyright © Materials Research Society 2019 

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