基于中子衍射技术对钛铝合金有序-无序相变计算的研究与展望

李茜; 顾炅琳; 刘国梁; 袁小明; 杜勇

doi:10.19976/j.cnki.43-1448/TF.2024119

粉末冶金材料科学与工程 >

2025 , Vol. 30 >Issue 3: 157 - 170

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2024119

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基于中子衍射技术对钛铝合金有序-无序相变计算的研究与展望

李茜 ,
顾炅琳 ,
刘国梁 ,
袁小明 ,
杜勇

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1.长沙理工大学柔性电子材料基因工程湖南省重点实验室,长沙 410114;
2.中南大学物理学院,长沙 410012;
3.中南大学粉末冶金研究院,长沙 410083

袁小明,教授,博士。电话：15367859660;E-mail: xiaoming.yuan@csu.edu.cn

收稿日期: 2024-12-31

修回日期: 2025-05-12

网络出版日期: 2025-07-28

基金资助

国家自然科学基金资助项目(52001029); 湖南省自然科学基金资助项目(2023JJ40037)

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Study and prospects for the calculation of order-disorder phase transition of Ti-Al alloy based on neutron diffraction technology

LI Xi ,
GU Jionglin ,
LIU Guoliang ,
YUAN Xiaoming ,
DU Yong

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1. Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering, Changsha University of Science and Technology, Changsha 410114, China;
2. School of Physics, Central South University, Changsha 410012, China;
3. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China

Received date: 2024-12-31

Revised date: 2025-05-12

Online published: 2025-07-28

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摘要

Ti-Al合金能有效提升航空发动机的性能,在航空航天领域具有不可或缺的应用价值。然而,该合金在升温、加压等加工过程中可能经历多个有序-无序相变,这会对其力学性能产生显著影响。X射线衍射在材料分析中应用广泛,但难以区分具有相同点阵结构的有序相和无序相(如α₂和α相),相比之下,中子衍射通过入射束流与物质的原子核相互作用产生衍射,具有比实验室传统X射线更强的穿透能力。而且中子衍射与X射线衍射的峰强度分布呈现出差异性,这使得中子衍射不仅能辅助区分Ti-Al合金有序相和无序相,还能进一步测量物相的有序度。中子衍射与X射线衍射技术在衍射图谱上的互补特性,为深入研究Ti-Al合金的有序-无序相变提供了强有力的支持。本文系统阐述了基于中子衍射和X射线衍射技术,计算Ti-Al合金衍射峰强度和有序度的方法,详细介绍了两种衍射技术的实验方法及其在Ti-Al合金相变研究中的应用,并展望了其在相关领域的应用与发展前景。

关键词： 中子衍射; X射线衍射; 钛铝合金; 有序-无序; 相转变

本文引用格式

李茜 , 顾炅琳 , 刘国梁 , 袁小明 , 杜勇 . 基于中子衍射技术对钛铝合金有序-无序相变计算的研究与展望[J]. 粉末冶金材料科学与工程, 2025 , 30(3) : 157 -170 . DOI: 10.19976/j.cnki.43-1448/TF.2024119

Abstract

Ti-Al alloys have indispensable application value in the aerospace field because they can effectively enhance the performance of aircraft engines. However, during the processing of heating and pressurization, the alloy may undergo multiple ordered-disordered phase transitions, which will significantly affect its mechanical properties. X-ray diffraction is widely used in material analysis, but it is difficult to distinguish ordered and disordered phases with the same lattice structure (such as α₂ and α phases). In contrast, neutron diffraction generate diffraction through the interaction between the incident beam and the atomic nuclei of the substance, and have stronger penetrating ability than traditional laboratory X-rays. Moreover, neutron diffraction and X-ray diffraction show differences in the distribution of diffraction peak intensities, which enables neutron diffraction not only to assist in distinguishing the ordered and disordered phases of Ti-Al alloys, but also to further measure the degree of order of the phases. Therefore, the complementary characteristic of neutron diffraction technology and X-ray diffraction technology in diffraction patterns provides a powerful support for in-depth research on the ordered-disordered phase transitions of Ti-Al alloys. This paper systematically elaborates on the methods for calculating the diffraction peak intensities and degree of order of Ti-Al alloys based on neutron diffraction and X-ray diffraction technologies. It also introduces the experimental methods of the two diffraction technologies and their applications in the study of phase transitions of Ti-Al alloys, and looks forward to their application and development prospects in related fields.

Key words： neutron diffraction; X-ray diffraction; Ti-Al alloy; order-disorder; phase transition

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