激光熔化沉积Ti-3Cu合金变形机制的准原位电子背散射衍射拉伸试验
收稿日期: 2024-12-09
修回日期: 2025-02-24
录用日期: 2025-05-12
网络出版日期: 2025-06-10
基金资助
国家自然科学基金(52465045)
Quasi-in situ electron backscatter diffraction tensile test on deformation mechanisms of laser melting deposited Ti-3Cu alloy
Received date: 2024-12-09
Revised date: 2025-02-24
Accepted date: 2025-05-12
Online published: 2025-06-10
Supported by
National Natural Science Foundation of China(52465045)
Ti-Cu合金具有良好的力学性能和耐腐蚀性，被用在生物医疗和航天发动机领域。然而，其变形机制鲜有研究。采用准原位拉伸试验，结合电子背散射衍射（EBSD）技术，研究了通过激光熔化沉积（LMD）原位合金化制备Ti-3Cu合金在室温拉伸过程中的显微组织演变行为。结果发现，变形过程中同一晶粒内不同区域呈现不同取向的旋转，位错主要分布在晶界和亚晶界上，低角度晶界（LAGB，2°~15°）的比例随着应变的增加而不断增加。局部晶粒演化过程分析表明，晶体取向和形貌不同的α晶粒在拉伸载荷作用下表现出不均匀变形，其整体应变由晶粒旋转和亚结构形成分配。通过Schmid因子的定量统计与滑移迹线的标定分析，证实棱柱滑移系为Ti-3Cu合金的主导滑移系统。对激光熔化沉积Ti-3Cu合金变形机制的研究可为Ti-Cu合金的制备和应用提供有益的指导。
关键词： Ti-3Cu合金; 激光熔化沉积（LMD）; 电子背散射衍射（EBSD）; 原位拉伸试验; 变形机制
姜丽红 , 朱琳 , 刘征 . 激光熔化沉积Ti-3Cu合金变形机制的准原位电子背散射衍射拉伸试验[J]. 航空学报, 2025 , 46(22) : 431642 -431642 . DOI: 10.7527/S1000-6893.2025.31642
Ti-Cu alloys exhibit excellent mechanical properties and corrosion resistance， making them promising candidates for biomedical and aerospace engineering applications. However， their deformation mechanisms remain poorly understood. Quasi-in situ tensile testing combined with Electron Backscatter Diffraction （EBSD） was employed to investigate the microstructural evolution of a Laser Melting Deposited （LMD） Ti-3Cu alloy fabricated via in situ alloying during room-temperature tensile deformation. The results demonstrated heterogeneous orientation rotations within localized regions of individual grains. Dislocations were primarily concentrated at grain and subgrain boundaries， accompanied by a progressive increase in the fraction of Low-Angle Grain Boundaries （LAGBs， 2°-15°） with increasing strain. Analysis of localized grain evolution revealed that α-grains with distinct crystallographic orientations and morphologies underwent non-uniform deformation， where macroscopic strain was accommodated through grain rotation and substructure formation. Quantitative Schmid factor analysis combined with slip trace characterization confirmed the dominance of the prismatic slip system in the Ti-3Cu alloy. These findings provide critical insights into the deformation mechanisms of laser-melting-deposited Ti-Cu alloys， offering guidance for their fabrication and application in advanced technologies.
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