NiTi合金(B2, B19’和R相)键合特征与弹性性质的第一性原理研究

材料导报

2019, Vol. 33

Issue (Z2): 383-388

金属与金属基复合材料

NiTi合金(B2, B19’和R相)键合特征与弹性性质的第一性原理研究

张然¹, 谢东¹, 冷永祥², 景凤娟², 黄楠²

1 西南交通大学物理科学与技术学院,材料先进技术教育部重点实验室,成都 610031;
2 西南交通大学材料科学与工程学院,成都 610031

First Principle Study on Bonding Characteristics and Elastic Properties of NiTiAlloy (B2, B19’, R Phase)

ZHANG Ran¹, XIE Dong¹, LENG Yongxiang², JING Fengjuan², HUANG Nan²

1 Key Laboratory of Advanced Technologies of Materials, Ministry of Education of China, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031;
2 School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031

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摘要运用第一性原理方法计算NiTi合金三种相结构(B2、B19’和R相)的电荷密度、态密度、Mulliken布居、弹性常数,在此基础上探究NiTi合金的键合特征、弹性性质及其内在联系。计算结果表明NiTi合金主要成键类型是金属键,其次还包括共价键和离子键。离子键主要由Ti原子向Ni原子转移少量电荷形成,共价键主要由Ni-3d和Ti-3d的轨道杂化形成,此外B19’和R相中Ni-Ni原子间存在电子云重叠也具有共价键特征。弹性性质计算表明三种相结构的NiTi合金均为延性材料,并具有不同程度的弹性各向异性特征。延性强弱顺序依次为B2>R>B19’,弹性各向异性程度的强弱顺序为B19’>B2>R。材料的延脆性和弹性各向异性主要与合金中共价键、金属键的特征和强度有关。金属键具有无方向性特征,金属键越强材料的延性性能会越强;共价键具有方向性特征,共价键越强,同时金属键越弱,则材料的弹性各向异性的程度会越高。本研究揭示了NiTi合金在B2→R→B19’马氏体相变过程中键合特征和弹性性质的变化情况,对NiTi合金器械的设计和应用具有重要的参考意义。

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关键词: NiTi合金键合特征弹性性能第一性原理

Abstract: The first principle method is applied to calculate the charge density, density of states, Mulliken population and elastic constants of three phases (B2, B19’ and R phase) of NiTi alloy. Furthermore, the bonding characteristics, elastic properties and intrinsic connections of different phases are investigated. The results show that there are metal bond, covalent bond and ionic bond in the NiTi alloy, and the proportion of metal bond is the largest. Ionic bond is mainly formed by charge transfer between Ti and Ni. The covalent bond is mainly formed by orbital hybridization of Ni-3d orbit and Ti-3d orbit, in addition, Ni and Ni share some charges to form covalent bond in B19’ and R phases. The results of elastic properties show that the three phases NiTi have ductility characteristics and different degrees of elastic anisotropy. The ductility of B2 phase is higher than R phase than B19’ phase and the elastic anisotropy degree of B19’ is larger than B2 phase than R phase. The ductility and elastic anisotropy are mainly related to the characteristics and strength of the covalent bond and metal bond in the alloy. Due to the non-directionality characteristics of metal bond and the directional characteristics of covalent bond, the material with strong metal bond have high ductility; the material with strong covalent bond and weak metal bond have large degree of elastic anisotropy.

Key words: NiTi alloy bonding characteristics elastic properties first principle

出版日期: 2019-11-25 发布日期: 2019-11-25

ZTFLH:

TG111

基金资助: 四川省科技厅应用基础研究项目(2019YJ0240)

通讯作者: Xie_dong_@163.com

作者简介: 张然,西南交通大学2017级硕士研究生。研究工作主要围绕形状记忆合金和陶瓷材料,开展关于材料性能和界面结构的基础理论和应用研究。
谢东,西南交通大学物理科学与技术学院教授、硕士研究生导师。主要从事真空镀膜、生物材料表面改性、材料力学性能第一性原理计算等方面的研究。

引用本文:

张然, 谢东, 冷永祥, 景凤娟, 黄楠. NiTi合金(B2, B19’和R相)键合特征与弹性性质的第一性原理研究[J]. 材料导报, 2019, 33(Z2): 383-388.
ZHANG Ran, XIE Dong, LENG Yongxiang, JING Fengjuan, HUANG Nan. First Principle Study on Bonding Characteristics and Elastic Properties of NiTiAlloy (B2, B19’, R Phase). Materials Reports, 2019, 33(Z2): 383-388.

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http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2019/V33/IZ2/383

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