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激光沉积预混合的近α钛合金和Ti2AlNb合金粉末中成分偏析与层错诱导亚晶结构形成
作者:
作者单位:

1.西北工业大学 材料学院,陕西 西安 710072;2.西北工业大学 凝固技术国家重点实验室,陕西 西安 710072;3.中国航发湖南动力机械研究所 发动机研发部,湖南 株洲 412002;4.西安欧中材料科技有限公司,陕西 西安 710018

基金项目:

国家自然科学基金项目(51974259),西安市科技计划项目21ZCZZHXJS-QCY6-0008,中国航空发动机公司产学研合作项目HFZL2020CXY021


Formation of Sub-grain Structure Induced by Composition Segregation and Stacking Faults in Laser-Deposited Premixed Near-α Titanium Alloy and Ti2AlNb Alloy Powders
Author:
Affiliation:

1.School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an710072, China;2.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an710072, China;3.Engine Development Department, AECC Hunan Aviation Powerplant Research Institute, Zhuzhou412002, China;4.Xi 'an Sino-Euro Materials Technologies Co., Ltd, Xi 'an710018, China

Fund Project:

National Natural Science Foundation of China (51974259); Xi'an Municipal Bureau of Science and Technology (21ZCZZHXJS-QCY6-0008); Industry-Academic Cooperation Project of Aero Engine Corporation of China (HFZL2020CXY021)

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    摘要:

    通过激光沉积在近α钛合金基板上制备了不同比例的预混合近α钛合金和Ti2AlNb合金粉末,并对2种粉末的微观组织演变和结构特征进行了分析和讨论。结果表明,Ti2AlNb含量在40%(质量分数,下同)以上的激光沉积预混合钛合金粉末的等轴B2晶粒内形成了许多河流状亚晶粒结构,而Ti2AlNb含量在40%以下的粗柱状β晶粒内则呈现针状结构。值得注意的是,降低激光功率和扫描速度可以促进亚晶粒结构的形成。基于实验结果的分析可以推断出,这种亚晶粒结构的形成不仅与亚晶界成分微偏析导致的O相析出有关,还与激光沉积过程中内应力诱导的堆垛层错密不可分。

    Abstract:

    Near-α titanium alloy and Ti2AlNb alloy powders premixed with different proportions were prepared on the near-α titanium alloy substrate by laser deposition technique, and the microstructure characteristics were analyzed and discussed. Results show that numerous river-like sub-grain structures are formed inside the equiaxed B2 grains of the laser-deposited premixed titanium alloy powders with the proportion of Ti2AlNb above 40wt%, whereas the needle-like structure within coarse columnar β grains exist with the proportion of Ti2AlNb below 40wt%. It is noteworthy that the decrease in laser power and scanning speed can accelerate the formation of sub-grain structures. Based on the analysis of experimental results, it can be inferred that the formation of sub-grain structure not only is related to the precipitation of O phase due to composition micro-segregation at sub-grain boundaries, but also is inseparable from the stacking faults caused by the internal stress during the laser deposition.

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刘娜,赵张龙,刘郁丽,冯凯凯,查小晖,李璞,徐文馨,杨海鸥,赖运金.激光沉积预混合的近α钛合金和Ti2AlNb合金粉末中成分偏析与层错诱导亚晶结构形成[J].稀有金属材料与工程,2024,53(12):3281~3290.[Liu Na, Zhao Zhanglong, Liu Yuli, Feng Kaikai, Zha Xiaohui, Li Pu, Xu Wenxin, Yang Haiou, Lai Yunjin. Formation of Sub-grain Structure Induced by Composition Segregation and Stacking Faults in Laser-Deposited Premixed Near-α Titanium Alloy and Ti2AlNb Alloy Powders[J]. Rare Metal Materials and Engineering,2024,53(12):3281~3290.]
DOI:10.12442/j. issn.1002-185X.20240097

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  • 收稿日期:2024-02-27
  • 最后修改日期:2024-04-16
  • 录用日期:2024-05-08
  • 在线发布日期: 2024-12-19
  • 出版日期: 2024-12-16