中国物理B ›› 2016, Vol. 25 ›› Issue (10): 107104-107104.doi: 10.1088/1674-1056/25/10/107104

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

First-principles studies of effects of interstitial boron and carbon on the structural, elastic, and electronic properties of Ni solution and Ni3Al intermetallics

Meng-Li Huang(黄梦礼), Chong-Yu Wang(王崇愚)   

  1. Department of Physics, Tsinghai University, Beijing 100084, China
  • 收稿日期:2016-04-08 修回日期:2016-07-06 出版日期:2016-10-05 发布日期:2016-10-05
  • 通讯作者: Chong-Yu Wang E-mail:cywang@mail.tsinghua.edu.cn
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB606402).

First-principles studies of effects of interstitial boron and carbon on the structural, elastic, and electronic properties of Ni solution and Ni3Al intermetallics

Meng-Li Huang(黄梦礼), Chong-Yu Wang(王崇愚)   

  1. Department of Physics, Tsinghai University, Beijing 100084, China
  • Received:2016-04-08 Revised:2016-07-06 Online:2016-10-05 Published:2016-10-05
  • Contact: Chong-Yu Wang E-mail:cywang@mail.tsinghua.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB606402).

摘要: The effects of boron and carbon on the structural, elastic, and electronic properties of both Ni solution and Ni3Al intermetallics are investigated using first-principles calculations. The results agree well with theoretical and experimental data from previous studies and are analyzed based on the density of states and charge density. It is found that both boron and carbon are inclined to occupy the Ni-rich interstices in Ni3Al, which gives rise to a cubic interstitial phase. In addition, the interstitial boron and carbon have different effects on the elastic moduli of Ni and Ni3Al. The calculation results for the G/B and Poisson's ratios further demonstrate that interstitial boron and carbon can both reduce the brittleness of Ni, thereby increasing its ductility. Meanwhile, boron can also enhance the ductility of the Ni3Al while carbon hardly has an effect on its brittleness or ductility.

关键词: Ni3Al, first-principles calculation, elastic constant, elastic modulus

Abstract: The effects of boron and carbon on the structural, elastic, and electronic properties of both Ni solution and Ni3Al intermetallics are investigated using first-principles calculations. The results agree well with theoretical and experimental data from previous studies and are analyzed based on the density of states and charge density. It is found that both boron and carbon are inclined to occupy the Ni-rich interstices in Ni3Al, which gives rise to a cubic interstitial phase. In addition, the interstitial boron and carbon have different effects on the elastic moduli of Ni and Ni3Al. The calculation results for the G/B and Poisson's ratios further demonstrate that interstitial boron and carbon can both reduce the brittleness of Ni, thereby increasing its ductility. Meanwhile, boron can also enhance the ductility of the Ni3Al while carbon hardly has an effect on its brittleness or ductility.

Key words: Ni3Al, first-principles calculation, elastic constant, elastic modulus

中图分类号:  (Intermetallic compounds)

  • 71.20.Lp
31.15.es (Applications of density-functional theory (e.g., to electronic structure and stability; defect formation; dielectric properties, susceptibilities; viscoelastic coefficients; Rydberg transition frequencies)) 62.20.D- (Elasticity) 71.15.Nc (Total energy and cohesive energy calculations)