Face-centered-cubic titanium - A new crystal structure of Ti in a Ti-8Mo-6Fe alloy

被引：31
作者：
Han, G. [1 ,2 ,3 ]
Lu, X. [2 ]
Xia, Q. [2 ]
Lei, B. [4 ,5 ]
Yan, Y. [2 ]
Shang, C. J. [1 ]
机构：
[1] Univ Sci & Technol Beijing, Collaborat Innovat Ctr Adv Steel Technol, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
[3] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[4] Chinese Acad Sci, Inst Phys, POB 603, Beijing 100190, Peoples R China
[5] Univ Chinese Acad Sci, Beijing 100190, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 748卷
基金：
中国国家自然科学基金;
关键词：
Ti-8Mo-6Fe alloy; Face-centered-cubic; Selected area electron diffraction; Electron diffuse scattering; MECHANICAL-PROPERTIES; PHASE-TRANSFORMATION; ELECTRON-DIFFRACTION; PLASTIC-DEFORMATION; OXYGEN VACANCIES; EXPLOSIVE CLAD; FCC TITANIUM; BETA; EVOLUTION; STEEL;
D O I：
10.1016/j.jallcom.2018.03.218
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The microstructure of a Ti-8Mo-6Fe ternary alloy with ultrafine grains was systematically studied with Tecnai-G2 F20 field transmission electron microscope and JEMS 2010 transmission electron microscope. A new Ti phase with face-centered-cubic (Fm-3m) structure was discovered. The morphology of these FCC Ti phases was elliptical, and they were widely distributed at interfaces between the polygonal BCC TiMoFe phases. The size of the FCC Ti phases was concentrated in the range of 200-450 nm. The lattice constant of FCC Ti phase was 0.431 nm. Simulated high-resolution images of FCC Ti and compounds of FCC TiC, TiN and TiO with different thicknesses and different defocus amounts were carried out to prove that the FCC structure in Ti-8Mo-6Fe alloy was indeed FCC Ti but not FCC TiC, TiN and TiO. First principle calculations revealed the metallic properties and stability of FCC Ti. All alloy elements of Mo and Fe were in the polygonal BCC TiMoFe phases. The semicircular arc periodic strips formed by electron diffuse scattering were present on the selected area electron diffraction (SAED) patterns of the BCC TiMoFe phase, which may come from the ordered domain of Mo and Fe or local ordering by Mo, Fe and Ti. (C) 2018 Elsevier B.V. All rights reserved.
引用
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页码：943 / 952
页数：10
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