欢迎访问《人工晶体学报》官方网站,今天是

人工晶体学报 ›› 2026, Vol. 55 ›› Issue (6): 949-955.DOI: 10.16553/j.cnki.issn1000-985x.2026.0036

• 研究论文 • 上一篇    下一篇

M2SnC(M=Ti、V、Hf、Zr)空位形成机理及其对力学性能的影响研究

沈雨楠1(), 平宇彤1, 黄妙妍1, 陈玥1, 刘玉爽1,2()   

  1. 1.南京工程学院材料科学与工程学院,江苏省先进结构材料与应用技术重点实验室,南京 211167
    2.东南大学材料科学与工程学院,江苏省先进金属材料高技术研究重点实验室,南京 211189
  • 收稿日期:2026-03-09 出版日期:2026-06-20 发布日期:2026-07-07
  • 通信作者: 刘玉爽,博士,副教授。E-mail:liuyushuang@njit.edu.cn
  • 作者简介:沈雨楠(2005—),男,江苏省人。E-mail:shenyunan0507@126.com
  • 基金资助:
    国家自然科学基金(52431003);国家自然科学基金(52001158)

Formation Mechanism of Vacancies on M2SnC (M=Ti, V, Hf, Zr) and Its Effect on Mechanical Properties

SHEN Yunan1(), PING Yutong1, HUANG Miaoyan1, CHEN Yue1, LIU Yushuang1,2()   

  1. 1.Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,School of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing 211167,China
    2.Jiangsu Key Laboratory of Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China
  • Received:2026-03-09 Online:2026-06-20 Published:2026-07-07

摘要: 针对M2SnC(M=Ti、V、Hf、Zr)中Sn空位形成及其对力学性能影响规律尚不明确的问题,本文采用基于密度泛函理论的第一性原理计算方法,对Sn空位的形成能、结构稳定性及其对力学性能的影响进行了系统研究。结果表明,M2SnC中Sn空位的形成能均低于M空位与C空位,表明Sn空位更易形成。其中,V2SnC中Sn空位形成能最低,Zr2SnC中Sn空位形成能最高。形成焓计算及弹性常数分析表明,引入Sn空位后结构仍保持热力学稳定性与力学稳定性。力学性能分析发现,Sn空位对不同M2SnC相的影响呈现明显的差异,引入Sn空位后Ti2SnC、Hf2SnC和Zr2SnC的体积模量、剪切模量及弹性模量均有所下降,而V2SnC的剪切模量与弹性模量则均有所提高,这可能与空位诱导的局域键合重构有关。MAX相是一类三元层状碳化物/氮化物陶瓷材料,研究结果对MAX相中A空位的构筑与调控提供了理论依据。

关键词: M2SnC; Sn空位; 第一性原理; 形成能; 力学性能

Abstract: To address the unresolved issues regarding the formation of Sn vacancies in M2SnC (M=Ti,V,Hf,Zr) and its influence on mechanical properties,this study systematically employed the first-principles calculation method based on density functional theory to investigate the formation energies,structural stability of Sn vacancies,and their effects on mechanical properties. The results indicate that the formation energies of Sn vacancies in M2SnC are lower than those of M and C vacancies,suggesting that Sn vacancies are more readily formed. Among the compounds,V2SnC exhibits the lowest formation energy for Sn vacancies,while Zr2SnC shows the highest formation energy for Sn vacancies. The formation enthalpy calculation and elastic constant analysis reveal that the structures remain thermodynamic and mechanical stablility after the introduction of Sn vacancies. Mechanical property analysis demonstrates that the influence of Sn vacancies varies significantly across different M2SnC phases. After the introduction of Sn vacancies,the bulk modulus,shear modulus and elastic modulus of Ti2SnC,Hf2SnC and Zr2SnC decrease,whereas the shear modulus and elastic modulus of V2SnC increase,whose enhancement may be attributed to vacancy-induced local bond reconstruction. MAX phases are a family of ternary layered carbide/nitride ceramic materials.The research results provide a theoretical foundation for the construction and modulation of A-site vacancies in MAX phases.

Key words: M2SnC; Sn vacancy; first-principle; formation energy; mechanical property

中图分类号: