Study and prospects for the calculation of order-disorder phase transition of Ti-Al alloy based on neutron diffraction technology
LI Xi1, GU Jionglin1, LIU Guoliang1, YUAN Xiaoming2, DU Yong3
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
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.
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.
LI Xi, GU Jionglin, LIU Guoliang, YUAN Xiaoming, DU Yong. Study and prospects for the calculation of order-disorder phase transition of Ti-Al alloy based on neutron diffraction technology. Materials Science and Engineering of Powder Metallurgy, 2025, 30(3): 157-170.
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